Package org.orekit.models.earth.atmosphere

Class JB2006

java.lang.Object

org.orekit.models.earth.atmosphere.AbstractSunInfluencedAtmosphere

org.orekit.models.earth.atmosphere.AbstractJacchiaBowmanModel

org.orekit.models.earth.atmosphere.JB2006

All Implemented Interfaces:

Atmosphere

public class JB2006
extends AbstractJacchiaBowmanModel

This is the realization of the Jacchia-Bowman 2006 atmospheric model.

It is described in the paper:
A New Empirical Thermospheric Density Model JB2006 Using New Solar Indices
Bruce R. Bowman, W. Kent Tobiska and Frank A. Marcos

AIAA 2006-6166

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 threw different indices, and planetary geomagnetic indices.
More information on these indices can be found on the official JB2006 website.

Since:

13.1

Author:

Bruce R Bowman (HQ AFSPC, Space Analysis Division), Feb 2006: FORTRAN routine, Fabien Maussion (java translation), Bryan Cazabonne (Orekit 13 update and field translation)

Constructor Summary

Constructors

Constructor	Description
JB2006(JB2006InputParameters parameters, ExtendedPositionProvider sun, BodyShape earth)	Constructor with space environment information for internal computation.
JB2006(JB2006InputParameters parameters, ExtendedPositionProvider sun, BodyShape earth, TimeScale utc)	Constructor with space environment information for internal computation.

Method Summary

Modifier and Type	Method	Description
protected double	computeTc(AbsoluteDate date)	Computes the temperature equation.
protected double	computeTInf(AbsoluteDate date, double tsubl, double dtclst)	Computes the local exospheric temperature.
protected <T extends CalculusFieldElement<T>> T	computeTInf(AbsoluteDate date, T tsubl, T dtclst)	Computes the local exospheric temperature.
protected double	getF10(AbsoluteDate date)	Get the 10.7-cm Solar flux (1e-22*Watt/(m²*Hertz)) (Tabular time 1.0 day earlier).
protected double	getF10B(AbsoluteDate date)	Get the 10.7-cm Solar Flux, averaged 81-day centered on the input time (Tabular time 1.0 day earlier).
protected double	semian(AbsoluteDate date, double day, double height)	Computes the semi-annual variation (delta log(rho)).
protected <T extends CalculusFieldElement<T>> T	semian(AbsoluteDate date, T doy, T height)	Computes the semi-annual variation (delta log(rho)).

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

computeDensity, computeDensity, getDensity, getDensity, getEarth, getFrame, getUtc

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

JB2006

@DefaultDataContext
public JB2006(JB2006InputParameters parameters,
              ExtendedPositionProvider sun,
              BodyShape earth)

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

JB2006

public JB2006(JB2006InputParameters 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.

Method Detail

computeTInf

protected double computeTInf(AbsoluteDate date,
                             double tsubl,
                             double dtclst)

Computes the local exospheric temperature.

Specified by:

computeTInf in class AbstractJacchiaBowmanModel

Parameters:

date - computation epoch

tsubl - exospheric temperature ("tsubl" term), given by Equation (17)

dtclst - correction to dTc for local solar time and lat correction

Returns:

the local exospheric temperature

computeTInf

protected <T extends CalculusFieldElement<T>> T computeTInf(AbsoluteDate date,
                                                            T tsubl,
                                                            T dtclst)

Computes the local exospheric temperature.

Specified by:

computeTInf in class AbstractJacchiaBowmanModel

Type Parameters:

T - type of the elements

Parameters:

date - computation epoch

tsubl - exospheric temperature ("tsubl" term), given by Equation (17)

dtclst - correction to dTc for local solar time and lat correction

Returns:

the local exospheric temperature

computeTc

protected double computeTc(AbsoluteDate date)

Computes the temperature equation.

Specified by:

computeTc in class AbstractJacchiaBowmanModel

Parameters:

date - computation epoch

Returns:

the temperature equation

getF10

protected double getF10(AbsoluteDate date)

Get the 10.7-cm Solar flux (1e^-22*Watt/(m²*Hertz))
(Tabular time 1.0 day earlier).

Specified by:

getF10 in class AbstractJacchiaBowmanModel

Parameters:

date - computation epoch

Returns:

the 10.7-cm Solar flux from model input parameters

getF10B

protected double getF10B(AbsoluteDate date)

Get the 10.7-cm Solar Flux, averaged 81-day centered on the input time
(Tabular time 1.0 day earlier).

Specified by:

getF10B in class AbstractJacchiaBowmanModel

Parameters:

date - computation epoch

Returns:

the 10.7-cm Solar Flux, averaged 81-day centered on the input time

semian

protected double semian(AbsoluteDate date,
                        double day,
                        double height)

Computes the semi-annual variation (delta log(rho)).

Specified by:

semian in class AbstractJacchiaBowmanModel

Parameters:

date - computation epoch

day - day of year

height - height (km)

Returns:

semi-annual variation

semian

protected <T extends CalculusFieldElement<T>> T semian(AbsoluteDate date,
                                                       T doy,
                                                       T height)

Computes the semi-annual variation (delta log(rho)).

Specified by:

semian in class AbstractJacchiaBowmanModel

Type Parameters:

T - type of the elements

Parameters:

date - computation epoch

doy - day of year

height - height (km)

Returns:

semi-annual variation