java.lang.Object
- org.orekit.models.earth.atmosphere.AbstractSunInfluencedAtmosphere
- - org.orekit.models.earth.atmosphere.JB2008

All Implemented Interfaces:

Serializable, Atmosphere
```
public class JB2008
extends AbstractSunInfluencedAtmosphere
```
This is the realization of the Jacchia-Bowman 2008 atmospheric model.
It is described in the paper:
A New Empirical Thermospheric Density Model JB2008 Using New Solar Indices
Bruce R. Bowman & al.
AIAA 2008-6438

Two computation methods are proposed to the user:
- one OREKIT independent and compliant with initial FORTRAN routine entry values: getDensity(double, double, double, double, double, double, double, double, double, double, double, double, double, double, double).
- one compliant with OREKIT Atmosphere interface, necessary to the drag force model computation.
This model provides dense output for all altitudes and positions. Output data are :
- Exospheric Temperature above Input Position (deg K)
- Temperature at Input Position (deg K)
- Total Mass-Density at Input Position (kg/m³)
The model needs geographical and time information to compute general values, but also needs space weather data : mean and daily solar flux, retrieved through different indices, and planetary geomagnetic indices.
More information on these indices can be found on the official JB2008 website.
Author:

Bruce R Bowman (HQ AFSPC, Space Analysis Division), 2008: FORTRAN routine, Pascal Parraud (java translation)

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor	Description
`JB2008(JB2008InputParameters parameters, ExtendedPositionProvider sun, BodyShape earth)`	Constructor with space environment information for internal computation.
`JB2008(JB2008InputParameters parameters, ExtendedPositionProvider sun, BodyShape earth, TimeScale utc)`	Constructor with space environment information for internal computation.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`getDensity(double dateMJD, double sunRA, double sunDecli, double satLon, double satLat, double satAlt, double f10, double f10B, double s10, double s10B, double xm10, double xm10B, double y10, double y10B, double dstdtc)`	Get the local density with initial entries.
`double`	`getDensity(AbsoluteDate date, Vector3D position, Frame frame)`	Get the local density.
`<T extends CalculusFieldElement<T>> T`	`getDensity(FieldAbsoluteDate<T> date, FieldVector3D<T> position, Frame frame)`	Get the local density.
`<T extends CalculusFieldElement<T>> T`	`getDensity(T dateMJD, T sunRA, T sunDecli, T satLon, T satLat, T satAlt, double f10, double f10B, double s10, double s10B, double xm10, double xm10B, double y10, double y10B, double dstdtc)`	Get the local density with initial entries.
`Frame`	`getFrame()`	Get the frame of the central body.

Methods inherited from class org.orekit.models.earth.atmosphere.AbstractSunInfluencedAtmosphere
getSun, getSunPosition, getSunPosition

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.orekit.models.earth.atmosphere.Atmosphere
getVelocity, getVelocity

- Constructor Detail
  - JB2008
```
@DefaultDataContext
public JB2008(JB2008InputParameters parameters,
              ExtendedPositionProvider sun,
              BodyShape earth)
```
    Constructor with space environment information for internal computation.
    This method uses the default data context.
    
    Parameters:
    
    parameters - the solar and magnetic activity data
    
    sun - the sun position
    
    earth - the earth body shape
    
    See Also:
    
    JB2008(JB2008InputParameters, ExtendedPositionProvider, BodyShape, TimeScale)
  - JB2008
```
public JB2008(JB2008InputParameters parameters,
              ExtendedPositionProvider sun,
              BodyShape earth,
              TimeScale utc)
```
    Constructor with space environment information for internal computation.
    
    Parameters:
    
    parameters - the solar and magnetic activity data
    
    sun - the sun position
    
    earth - the earth body shape
    
    utc - UTC time scale. Used to computed the day fraction.
    
    Since:
    
    10.1
- Method Detail
  - getFrame
```
public Frame getFrame()
```
    Get the frame of the central body.
    
    Returns:
    
    frame of the central body.
  - getDensity
```
public double getDensity(double dateMJD,
                         double sunRA,
                         double sunDecli,
                         double satLon,
                         double satLat,
                         double satAlt,
                         double f10,
                         double f10B,
                         double s10,
                         double s10B,
                         double xm10,
                         double xm10B,
                         double y10,
                         double y10B,
                         double dstdtc)
```
    Get the local density with initial entries.
    
    Parameters:
    
    dateMJD - date and time, in modified julian days and fraction
    
    sunRA - Right Ascension of Sun (radians)
    
    sunDecli - Declination of Sun (radians)
    
    satLon - Right Ascension of position (radians)
    
    satLat - Geocentric latitude of position (radians)
    
    satAlt - Height of position (m)
    
    f10 - 10.7-cm Solar flux (1e^-22*Watt/(m²*Hertz))
    (Tabular time 1.0 day earlier)
    
    f10B - 10.7-cm Solar Flux, averaged 81-day centered on the input time
    (Tabular time 1.0 day earlier)
    
    s10 - EUV index (26-34 nm) scaled to F10
    (Tabular time 1 day earlier)
    
    s10B - UV 81-day averaged centered index (Tabular time 1 day earlier)
    
    xm10 - MG2 index scaled to F10
    (Tabular time 2.0 days earlier)
    
    xm10B - MG2 81-day ave. centered index
    (Tabular time 2.0 days earlier)
    
    y10 - Solar X-Ray & Lya index scaled to F10
    (Tabular time 5.0 days earlier)
    
    y10B - Solar X-Ray & Lya 81-day ave. centered index
    (Tabular time 5.0 days earlier)
    
    dstdtc - Temperature change computed from Dst index
    
    Returns:
    
    total mass-Density at input position (kg/m³)
  - getDensity
```
public <T extends CalculusFieldElement<T>> T getDensity(T dateMJD,
                                                        T sunRA,
                                                        T sunDecli,
                                                        T satLon,
                                                        T satLat,
                                                        T satAlt,
                                                        double f10,
                                                        double f10B,
                                                        double s10,
                                                        double s10B,
                                                        double xm10,
                                                        double xm10B,
                                                        double y10,
                                                        double y10B,
                                                        double dstdtc)
```
    Get the local density with initial entries.
    
    Type Parameters:
    
    T - type of the field elements
    
    Parameters:
    
    dateMJD - date and time, in modified julian days and fraction
    
    sunRA - Right Ascension of Sun (radians)
    
    sunDecli - Declination of Sun (radians)
    
    satLon - Right Ascension of position (radians)
    
    satLat - Geocentric latitude of position (radians)
    
    satAlt - Height of position (m)
    
    f10 - 10.7-cm Solar flux (1e^-22*Watt/(m²*Hertz))
    (Tabular time 1.0 day earlier)
    
    f10B - 10.7-cm Solar Flux, averaged 81-day centered on the input time
    (Tabular time 1.0 day earlier)
    
    s10 - EUV index (26-34 nm) scaled to F10
    (Tabular time 1 day earlier)
    
    s10B - UV 81-day averaged centered index (Tabular time 1 day earlier)
    
    xm10 - MG2 index scaled to F10
    (Tabular time 2.0 days earlier)
    
    xm10B - MG2 81-day ave. centered index
    (Tabular time 2.0 days earlier)
    
    y10 - Solar X-Ray & Lya index scaled to F10
    (Tabular time 5.0 days earlier)
    
    y10B - Solar X-Ray & Lya 81-day ave. centered index
    (Tabular time 5.0 days earlier)
    
    dstdtc - Temperature change computed from Dst index
    
    Returns:
    
    total mass-Density at input position (kg/m³)
  - getDensity
```
public double getDensity(AbsoluteDate date,
                         Vector3D position,
                         Frame frame)
```
    Get the local density.
    
    Parameters:
    
    date - current date
    
    position - current position in frame
    
    frame - the frame in which is defined the position
    
    Returns:
    
    local density (kg/m³)
  - getDensity
```
public <T extends CalculusFieldElement<T>> T getDensity(FieldAbsoluteDate<T> date,
                                                        FieldVector3D<T> position,
                                                        Frame frame)
```
    Get the local density.
    
    Type Parameters:
    
    T - instance of CalculusFieldElement
    
    Parameters:
    
    date - current date
    
    position - current position in frame
    
    frame - the frame in which is defined the position
    
    Returns:
    
    local density (kg/m³)

Class JB2008

Constructor Summary

Method Summary

Methods inherited from class org.orekit.models.earth.atmosphere.AbstractSunInfluencedAtmosphere

Methods inherited from class java.lang.Object

Methods inherited from interface org.orekit.models.earth.atmosphere.Atmosphere

Constructor Detail

JB2008

JB2008

Method Detail

getFrame

getDensity

getDensity

getDensity

getDensity