User Manual 4.13 Environment Models

Introduction

Scope

The scope of this section is to present the physical models available through the Patrius library.

Javadoc

All the classes related to physical models are in the fr.cnes.sirius.patrius.forces and fr.cnes.sirius.patrius.math.parameterpackages. The classes related to reading potential files are in the package fr.cnes.sirius.patrius.forces.gravity.potential.

Library	Javadoc
Patrius	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/package-summary.html Package fr.cnes.sirius.patrius.forces.atmospheres]
Patrius	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/package-summary.html Package fr.cnes.sirius.patrius.forces.atmospheres.solarActivity]
Patrius	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/specialized/package-summary.html Package fr.cnes.sirius.patrius.forces.atmospheres.solarActivity.specialized]
Patrius	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/specialized/package-summary.html Package fr.cnes.sirius.patrius.forces.atmospheres.solarActivity.specialized]
Patrius	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/potential/package-summary.html Package fr.cnes.sirius.patrius.forces.gravity.potential]
Patrius	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/variations/package-summary.html Package fr.cnes.sirius.patrius.forces.gravity.variations]
Patrius	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/tides/coefficients/package-summary.html Package fr.cnes.sirius.patrius.forces.gravity.tides.coefficients]
Patrius	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/models/earth/package-summary.html Package fr.cnes.sirius.patrius.math.parameter]
Patrius	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/tides/ReferencePointsDisplacement.html Class fr.cnes.sirius.patrius.utils.ReferencePointsDisplacement]

Links

Some useful links are given hereunder.

IERS Page IERS Conventions (2010), Technical Note No.36

Project Pages

Results Pages

EGM96: The NASA GSFC and NIMA Joint Geopotential Model, Lemoine; F. G., Kenyon; S. C., Factor; J. K., Trimmer; R.G., Pavlis; N. K., Chinn; D. S., Cox; C. M., Klosko; S. M., Luthcke; S. B., Torrence; M. H., Wang; Y. M., Williamson; R. G., Pavlis; E. C., Rapp; R. H., Olson; T. R., NASA Goddard Space Flight Center, Greenbelt, Maryland, 20771 USA, July 1998, Available here.
GFZ : Global Gravity Field Models, Available here.

Useful Documents

None as of now.

Package Overview

None as of now.

Features Description

Earth Potential Models

The fr.cnes.sirius.patrius.forces.gravity.potential package provides tools allowing the user to read external gravity potential data files. The following file formats are supported :

EGM96 ASCII format data
EIGEN-GRACE format
ICGEM format
GRGS format

Below is a diagram showing the architecture of the fr.cnes.sirius.patrius.forces.gravity.potential package.

For a detailed explanation of the Data Management System, please refer to the [SUP_DMS_Home Data Management System section] of the Support User Manual.

The fr.cnes.sirius.patrius.forces.gravity.variations package provides tools allowing the user to read external variable gravity potential data files. The corresponding ForceModel is also included in the package. The following file formats are supported :

GRGS RL02

Below is a diagram showing the architecture of the fr.cnes.sirius.patrius.forces.gravity.variations package.

By default, some loaders are added to VariableGravityFieldFactory in the following order:

GRGSRL02FormatReader: GRGSR L02 file format

There is no included data in PATRIUS by default Once loaded, data are stored in static variables and are used for variable gravity field computation.

Atmosphere models and solar activity model

Generalities about Solar Activity and Atmospheres

The atmospheres make use of solar activity in order to compute the density at the given user location excepted US76 model that is only based on altitude parameters. The PATRIUS architecture of atmospheres and solar activity is divided into three layers :

Atmospheres use solar data in specific ways

Each atmosphere model uses the solar data in a specific way (more simply, US76 doesn't use solar data). These representations are enclosed in the atmosphere model specific interfaces, such as DTMInputParamters. Atmosphere models available include US76 (for low altitudes in range 0 to 1000km), DTM2000, DTM2012 and MSISE2000.

Reading and storing solar data

The way to store the solar data is enclosed in the SolarActivityDataProvider interface. It defines the basic coefficients (Ap, Kp and F10.7 cm) that any solar activity data provider class should be able to return, in order to be compatible with the atmosphere specific implementations (see next point). The solarActivity package contains classes that can read different file formats and can return the solar activity data. So far, one class for each of the ACSOL and NOAA formats has been implemented. Additionally, one class representing constant solar activity (that requires no external file) has been implemented.

Using the solar data in an adequate fashion

Making effective use of the solar data for specific atmospheres requires an object that provides solar data (implementing the SolarActivityDataProvider) and answers to the interfaces that define the ways in which the atmosphere models use this data (e.g. implementing DTMInputParameters). These classes are contained in the fr.cnes.sirius.patrius.forces.atmospheres.solarActivity.specialized package). So far, one class for each of the DTM2000/DTM2012 and MSISE2000 models have been implemented.

The fr.cnes.sirius.patrius.forces.atmospheres.solarActivity package follows the same architecture as the fr.cnes.sirius.patrius.forces.gravity.potential package. The user must use the SolarActivityDataFactory class.

For a detailed explanation of the Data Management System, please refer to the [SUP_DMS_Home Data Management System section] of the Support User Manual.

For performances reasons, numerical propagator checks availability of solar activity data at start of propagation and not at every solar activity data call. If required solar activity or geomagnetic activity does not cover the required range by the atmospheric model, an exception is returned.

Atmospheric models

Various models are available in PATRIUS: DTM-2000, DTM-2012, MSIS-00, US76, etc. all models inherit the Atmosphere interface providing total density information.
DTM and MSIS models also implement the ExtendedAtmosphere interface which provides more detailed data such as temperature and partial densities of atmosphere constituents.
Some models require solar and geomagnetic information (see below for how to provide solar and geomagnetic data).

MSIS2000 Atmosphere model

The NRLMSISE-00 empirical atmosphere model was developed by Mike Picone, Alan Hedin, and Doug Drob. It describes the neutral temperature and densities in Earth's atmosphere from ground to thermospheric heights. (quoted from [1])

More information can be found at the Naval Research Laboratory website.

In order to use this atmosphere model, the user must proceed by giving the following arguments as inputs to the MSISE2000 class :

Solar activity data (as a MSISE2000InputParameters)
the Earth model (as a BodyShape)
the Sun model (as a CelestialBody)

The following code snippet creates an instance of MSISE2000 :

 // Create an instance of the BodyShape "EARTH", with user chosen
 // equatorial radius, flattening and body frame
 Frame frame = FramesFactory.getITRF();
 double f = 0.29825765000000E+03;
 double ae = 6378136.46;
 BodyShape earth = new OneAxisEllipsoid(ae, 1 / f, frame);
 
 // Get the instance of the CelestialBody "SUN"
 CelestialBody sun = CelestialBodyFactory.getSun();
 
 // Create the solar activity data to be used
 SolarActivityDataProvider solarActivity = SolarActivityDataFactory.getSolarActivityDataProvider();
 final MSISE2000InputParameters msiseData = new ClassicalMSISE2000SolarData(solarActivity);
 
 // Create an instance of the atmosphere model
 Atmosphere atmosModel = new MSISE2000(msiseData , earth, sun);

Warning: this model is not continuous. There is a discontinuity every day (at 0h in UTC time scale). Discontinuities are however very small (1E-3 on a relative scale).

Solar and geomagnetic activity

Solar and geomagnetic activity can be provided in various ways:

Constant solar activity using:

final SolarActivityDataProvider constantSolarActivity = new ConstantSolarActivity(140, 15);

Variable solar activity using (for instance):

final SolarActivityDataProvider variableSolarActivity = new NOAAFormatReader(...);
final SolarActivityDataProvider otherVariableSolarActivity = new ACSOLFormatReader(...);

Solar and geomagnetic activity data often having a limited timespan, the class ExtendedSolarActivityWrapper allows data extension with constant values. Solar and geomagnetic data returned before timespan are equals to an average of first available data (the average duration being user-chosen). Solar and geomagnetic data returned after timespan are equals to an average of last available data (the average duration being user-chosen). Example:

final SolarActivityDataProvider innerProvider = new NOAAFormatReader() // Variable solar activity over a given timespan
final double duration = 86400; // Duration on which average solar activity will be computed if date out of innerProvider timespan
final ExtendedSolarActivityWrapper solarActivity = new ExtendedSolarActivityWrapper(innerProvider, duration)// Extended solar activity

The above code will create an solar activity whose value will be:

Value of innerProvider if date is within innerProvider timespan
Average value on [lower boundary, lower boundary + duration] if date is before innerProvider lower boundary
Average value on [upper boundary- duration, upper boundary] if date is after innerProvider upperboundary

These providers are used as inputs of atmospheric models.

Reading Solar Activity Data files

The data is read through the DataLoader infrastructure; it provides several ways to load solar activity data. Please see the [SUP_DMS_Home Data Management System section] for more information.

The following file formats are supported by PATRIUS:

ACSOL format
NOAA format

The user access point is the SolarActivityDataFactory which automatically detects available files and uses the adequate solar file reader. If no file is specified by the user, this factory uses the first available file.

//Directory containing the file ACSOL.act
final File potdir = new File("/my/data/solar");
//The directory is given to the data loader
DataProvidersManager.getInstance().addProvider(new DirectoryCrawler(potdir));
//The ACSOL file is registered in the SolarActivityDataFactory
//If it is the only solar activity file of the directory, this step is not necessary
SolarActivityDataFactory.addSolarActivityDataReader(new ACSOLFormatReader("ACSOL.act"));
//A provider for the data is created
final SolarActivityDataProvider provider = SolarActivityDataFactory.getSolarActivityDataProvider();
//Get the ap, kp and instant flux at date
final AbsoluteDate userDate = new AbsoluteDate();
final double ap = provider.getAp( userDate );
final double kp = provider.getKp( userDate );
final double f = provider.getInstantFluxValue( userDate );

By default, some loaders are added to SolarActivityDataFactory in the following order:

ACSOLFormatReader: ACSOL file format
NOAAFormatReader: NOAA file format

There is no included data in PATRIUS by default Once loaded, data are stored in static variables and are used for solar activity retrieval.

Tides models

Tides model for force computation

The PATRIUS fr.cnes.sirius.patrius.forces.gravity.tides package provides tools allowing the user to use Terestrial and Ocean tides. The fr.cnes.sirius.patrius.forces.gravity.tides.coefficients package also allows reading external ocean tides coefficients data files. The following file formats are supported by PATRIUS:

FES2004 format

By default, some loaders are added to OceanTidesCoefficientFactory in the following order:

FES2004FormatReader: FES 2004 file format

There is no included data in PATRIUS by default Once loaded, data are stored in static variables and are used for ocean tides computation.

Reference point displacement

The PATRIUS fr.cnes.sirius.patrius.utils.ReferencePointsDisplacement class provides a model describing the displacement of reference points due to the effect of the solid Earth tides. The computation is performed by the static method solidEarthTidesCorrections(AbsoluteDate, Vector3D, Vector3D, Vector3D). The implemented model has been validated by comparison with tests available in the IERS website. The example below shows the user how to compute displacements of reference points:

// Test from source ftp://tai.bipm.org/iers/convupdt/chapter7/dehanttideinel/DEHANTTIDEINEL.F
 
// date : 13/04/2009
final AbsoluteDate date = new AbsoluteDate(2009, 4, 13, 0, 0, 0., TimeScalesFactory.getUTC());
 
// entries : moon position, sun position, station location
final Vector3D moon = new Vector3D(-179996231.920342,-312468450.131567, -169288918.592160);
final Vector3D sun = new Vector3D(137859926952.015, 54228127881.4350, 23509422341.6960);
final Vector3D point = new Vector3D(4075578.385, 931852.890, 4801570.154);
 
// compute the displacement
final Vector3D disp = ReferencePointsDisplacement.solidEarthTidesCorrections(date, point, sun, moon);
 
// comparison with reference results (IERS)
Assert.assertEquals(0.07700420357108125891, disp.getX(), Precision.EPSILON);
Assert.assertEquals(0.06304056321824967613, disp.getY(), Precision.EPSILON);
Assert.assertEquals(0.05516568152597246810, disp.getZ(), Precision.EPSILON);

Geomagnetic models

Design

The fr.cnes.sirius.patrius.models.earth package provides tools allowing the user to use different geomagnetic models. For the moment, there are only the two following models available :

IGRF 11 : International Geomagnetic Reference Field eleventh generation
WMM 2010 : World Magnetic Model published in december 2009

A class diagram is given hereunder to show how geomagnetic is read and used in the library :

The user can create its own GeoMagneticModelReader in order to provide GeoMagneticField from any file format.

By default, some loaders are added to GeoMagneticFieldFactory in the following order:

COFFileFormatReader: COF file format

There is no included data in PATRIUS by default Once loaded, data are stored in static variables and are used for geomagnetic field computation (IGRF and WMM).

IGRF 11 geomagnetic model

The International Geomagnetic Reference Field (IGRF) was introduced by the International Association of Geomagnetism and Aeronomy (IAGA) in 1968 in response to the demand for a standard spherical harmonic representation of the Earth's main field. The model is updated at 5-yearly intervals, the latest being the 11th generation, produced and released by IAGA Working Group V-MOD (formerly V-8) December 2009.

More information can be found at the IAGA Division V-Mod.

WMM 2010 geomagnetic model

The World Magnetic Model is a joint product of the United States’ National Geospatial-Intelligence Agency (NGA) and the United Kingdom’s Defence Geographic Centre (DGC). The WMM was developed jointly by the National Geophysical Data Center (NGDC, Boulder CO, USA) and the British Geological Survey (BGS, Edinburgh, Scotland).

The World Magnetic Model is the standard model used by the U.S. Department of Defense, the U.K. Ministry of Defence, the North Atlantic Treaty Organization (NATO) and the International Hydrographic Organization (IHO), for navigation, attitude and heading referencing systems using the geomagnetic field. It is also used widely in civilian navigation and heading systems. The model, associated software, and documentation are distributed by NGDC on behalf of NGA. The model is produced at 5-year intervals, with the current model expiring on December 31, 2014.

The current model, WMM2010 (published 12/2009)

More information can be found at the National Oceanic and Atmospheric Administration.

Details, limitation and precautions

In the geomagnetic field's computation from the different models, to convert geodetic coordinates (defined by the WGS-84 reference ellipsoid) to Earth Centered spherical coordinates, the following constants are used :

Semi major-axis of WGS-84 ellipsoid : 6378.137 km
The first eccentricity squared : 0.0066943799901413169961

and to compute the spherical harmonic variables for a given spherical coordinate uses the mean radius of IAU-66 ellipsoid 6371.2 km is used.

The different models are used to compute gemoagnetic field near earth surface. In the model file, the given altitude range of validity is-1 to 600 km even if we can compute field outside of this range.

The method GeoMagneticField.calculateField(final Vector3D point,final Frame frame, final AbsoluteDate date) has been added to Patrius and allows to compute the field from a position vector in a specific frame and at a specific date. This method is based on tranformModel method which recomputes the field at a date. This method doesn't work if the model doesn't support time transform. In this way, this method added to Patrius throws a Patrius exception about model not supporting time transform.

Here is the list of all possible actual models and the time transform support (please note that only dates prior to 2010 won't support time transformation) :

Model and associated data file	Model Name	Validity Period	Time transform support
IGRF (GeoMagneticFieldFactory.getIGRF(..) uses IGRF.COF)	IGRF00	1900.0 - 1905.0	false
	IGRF05	1905.0 - 1910.0	false
	IGRF10	1910.0 - 1915.0	false
	IGRF15	1915.0 - 1920.0	false
	IGRF20	1920.0 - 1925.0	false
	IGRF25	1925.0 - 1930.0	false
	IGRF30	1930.0 - 1935.0	false
	IGRF35	1935.0 - 1940.0	false
	IGRF40	1940.0 - 1945.0	false
	DGRF45	1945.0 - 1950.0	false
	DGRF50	1950.0 - 1955.0	false
	DGRF55	1955.0 - 1960.0	false
	DGRF60	1960.0 - 1965.0	false
	DGRF65	1965.0 - 1970.0	false
	DGRF70	1970.0 - 1975.0	false
	DGRF75	1975.0 - 1980.0	false
	DGRF80	1980.0 - 1985.0	false
	DGRF85	1985.0 - 1990.0	false
	DGRF90	1990.0 - 1995.0	false
	DGRF95	1995.0 - 2000.0	false
	DGRF2000	2000.0 - 2005.0	false
	DGRF2005	2005.0 - 2010.0	false
	IGRF2010	2010.0 - 2015.0	true
WMM (GeoMagneticFieldFactory.getWMM(..) uses WMM.COF)	WMM2010	2010.0 - 2015.0	true

Precautions : The method GeoMagneticField.calculateField (final double latitude, final double longitude, final double height) doesn't use SI units. Latitude and longitude are given in degrees, and height is given in kilometers.

Getting Started

Code Example

The following code sample computes geomagnetic field elements for four (date, position) of a fake trajectory :

    public void codeExemple() throws PatriusException {
 
        Utils.setDataRoot("earth");
        FramesFactory.setConfiguration(Utils.getIERS2003ConfigurationWOEOP(true));
 
        //Fake trajectory : list of date and list of position
        List<AbsoluteDate> dateList = new ArrayList<AbsoluteDate>();
        AbsoluteDate initDate = new AbsoluteDate(2010, 1, 1, 12, 0, 0.0, TimeScalesFactory.getTT());
 
        dateList.add(initDate);
        dateList.add(new AbsoluteDate(initDate, 600));
        dateList.add(new AbsoluteDate(initDate, 1200));
        dateList.add(new AbsoluteDate(initDate, 1800));
 
        List<Vector3D> positionList = new ArrayList<Vector3D>();
        positionList.add(new Vector3D(6.46885878304673824e+06,-1.88050918456274318e+06, -1.32931592294715829e+04));
        positionList.add(new Vector3D(6.58239141552595049e+06,-1.43349476017528563e+06, -1.39460373997706010e+04));
        positionList.add(new Vector3D(6.66499609614125639e+06,-9.79745192516532145e+05, -1.45334684008149434e+04));
        positionList.add(new Vector3D(6.71628402448997274e+06,-5.21392324304617418e+05, -1.50526405214286660e+04));
 
        // Get the model to the initial date
        final GeoMagneticField model = GeoMagneticFieldFactory.getIGRF(dateList.get(0));
 
        // For each date and position, compute the GeoMagneticElement and add it to a list
        List<GeoMagneticElements> geoMagList = new ArrayList<GeoMagneticElements>();
        int i = 0;
        for (AbsoluteDate date : dateList){
            geoMagList.add(model.calculateField(positionList.get(i), FramesFactory.getEME2000(), date));
        }
 
        // Print each field vector B 
        for (GeoMagneticElements geoMagElement : geoMagList){
            System.out.println(geoMagElement.toString());
        }
    }

This code produces the following standard output :

MagneticField[B={29817,109;-2303,065; -9138,097},H=29905,92,F=31270,895,I=-16,991,D=-4,417]
MagneticField[B={29442,018;-2166,283; -8949,299},H=29521,606,F=30848,261,I=-16,864,D=-4,208]
MagneticField[B={29067,408;-1996,393; -8794,324},H=29135,885,F=30434,19,I=-16,796,D=-3,929]
MagneticField[B={28695,713;-1796,821; -8680,411},H=28751,913,F=30033,681,I=-16,799,D=-3,583]

Interface	Summary	Javadoc
Atmosphere	Interface for atmospheric models.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/Atmosphere.html ...]
ExtendedAtmosphere	Interface for atmospheric models with detailed data.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/ExtendedAtmosphere.html ...]
SolarActivityDataProvider	Interface for solar activity data providers, to be used for atmosphere models	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/SolarActivityDataProvider.html ...]
DTM2000InputParameters	Container for solar activity data, compatible with DTM Atmosphere models.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/DTMInputParameters.html ...]
MSISE2000InputParameters	Container for solar activity data, compatible with MSISE2000 Atmosphere model.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/MSISE2000InputParameters.html ...]
OceanTidesCoefficientsProvider	This interface is used to provide ocean tides coefficients.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/tides/coefficients/OceanTidesCoefficientsProvider.html ...]
PotentialCoefficientsProvider	This interface is used to provide gravity field coefficients.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/potential/PotentialCoefficientsProvider.html ...]
VariablePotentialCoefficientsProvider	This interface is used to provide variable gravity field coefficients.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/variations/coefficients/VariablePotentialCoefficientsProvider.html ...]
RadiationSensitive	This interface is used to provide an direct solar radiative pressure model.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/radiation/RadiationSensitive.html ...]
RediffusedRadiationSensitive	This interface is used to provide an rediffused radiative pressure model.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/radiation/RediffusedRadiationSensitive.html ...]
GeoMagneticDataProvider	This interface is a generic geomagnetic data provider.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/models/earth/GeoMagneticDataProvider.html ...]

Classes

Earth potential

Class	Summary	Javadoc
EGMFormatReader	This reader is adapted to the EGM Format.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/potential/EGMFormatReader.html ...]
GravityFieldFactory	Factory used to read gravity field files in several supported formats. Main user access point : the simple way of reading a potential file is by using this factory.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/potential/GravityFieldFactory.html ...]
VariableGravityFieldFactory	Factory used to read variable gravity field files in several supported formats. Main user access point : the simple way of reading a variable potential file is by using this factory.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/variations/coefficients/VariableGravityFieldFactory.html ...]
GRGSFormatReader	Reader for the GRGS gravity field format.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/potential/GRGSFormatReader.html ...]
GRGSRL02FormatReader	Reader for the GRGS RL02 variable gravity field format.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/variations/coefficients/GRGSRL02FormatReader.html ...]
ICGEMFormatReader	Reader for the ICGEM gravity field format.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/potential/ICGEMFormatReader.html ...]
PotentialCoefficientsReader	This abstract class represents a Gravitational Potential Coefficients file reader.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/potential/PotentialCoefficientsReader.html ...]
SHMFormatReader	Reader for the SHM gravity field format.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/potential/SHMFormatReader.html ...]

Atmosphere Models

Class	Summary	Javadoc
DTM2000	This class implements the DTM2000 atmospheric model.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/DTM2000.html ...]
DTM2012	This class implements the DTM2012 atmospheric model.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/DTM2012.html ...]
JB2006	This class implements the JB2006 atmospheric model.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/JB2006.html ...]
MSISE2000	This class implements the MSIS00 atmospheric model.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/MSISE2000.html ...]
US76	This class implements the US76 atmospheric model.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/US76.html ...]

Solar Activity

Class	Summary	Javadoc
DTMSolarData	This class represents a solar data container adapted for the DTM atmosphere models.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/specialized/DTMSolarData.html ...]
ClassicalMSISE2000SolarData	This class represents a solar data container adapted for the MSISE2000 atmosphere model. The average ap values are computed arithmetically.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/specialized/ClassicalMSISE2000SolarData.html ...]
ContinuousMSISE2000SolarData	This class represents a solar data container adapted for the MSISE2000 atmosphere model. The mean ap values are computed by trapezoidal integration.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/specialized/ContinuousMSISE2000SolarData.html ...]
ACSOLFormatReader	This class reads ACSOL format solar activity data	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/ACSOLFormatReader.html ...]
ConstantSolarActivity	This class represents constant solar activity	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/ConstantSolarActivity.html ...]
NOAAFormatReader	This class reads NOAA format solar activity data	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/NOAAFormatReader.html ...]
SolarActivityDataFactory	Factory used to read solar activity files and return SolarActivityDataProvider	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/SolarActivityDataFactory.html ...]
SolarActivityToolbox	Solar activity toolbox. Has methods to compute mean flux values, to convert from ap to kp.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/SolarActivityToolbox.html ...]
MarshallSolarActivityFutureEstimation	This class reads and provides solar activity data needed by atmospheric models: F107 solar flux and Kp indexes.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/specialized/MarshallSolarActivityFutureEstimation.html ...]
ExtendedSolarActivityWrapper	This class extends a solar activity provider out of its timespan with constant values.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/atmospheres/solarActivity/ExtendedSolarActivityWrapper.html ...]

Ocean Tides Coefficients

Class	Summary	Javadoc
FES2004FormatReader	Reader for FES2004 format coefficients files.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/tides/coefficients/FES2004FormatReader.html ...]
OceanTidesCoefficientsFactory	Factory used to read ocean tides coefficients files in different formats and return an OceanTidesCoefficientsProvider.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/tides/coefficients/OceanTidesCoefficientsFactory.html ...]
OceanTidesCoefficientsReader	This abstract class represents a Ocean Tides Coefficients file reader.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/tides/coefficients/OceanTidesCoefficientsReader.html ...]
OceanTidesCoefficientsSet	Represents a line from the ocean tides data file.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/forces/gravity/tides/coefficients/OceanTidesCoefficientsSet.html ...]

Geomagnetic Field

Class	Summary	Javadoc
GeoMagneticElements	This class contains all the elements about a magnetic field : the magnetic field vector and associated caracteristics Inclination, Declination, Total Intensity, Horizontal Intensity.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/models/earth/GeoMagneticElements.html ...]
GeoMagneticField	These objects are produced by the factory and are based on a model for a decimal year date and allows to compute GeomagneticElements	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/models/earth/GeoMagneticField.html ...]
GeoMagneticFieldFactory	Factory to produce GeoMagneticField.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/models/earth/GeoMagneticFieldFactory.html ...]
GeoMagneticModelReader	To load the model from an input file	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/models/earth/GeoMagneticModelReader.html ...]
COFFileFormatReader	Class loading the geomagnetic data from COF files.	[[[:Modèle:JavaDoc4.13]]/fr/cnes/sirius/patrius/models/earth/COFFileFormatReader.html ...]