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Path: SCPro/ProEnvirons
% Computes the atmospheric density using Jacchia's 1970 model or scale heights.
Jacchia is only valid above 80 km, so this function switches to scale
heights at 80 km to give a smooth curve.
Type AtmJ70ToGround for a demo.
See also AtmJ70, AtmDens2, and SolarFluxPrediction.
With one argument d.jD and d.rECI may be arrays.
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Form:
rho = AtmJ70ToGround( d );
rho = AtmJ70ToGround( h, d )
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Inputs
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h (1,:) Altitude
d (:) Data structure
.aP (1,1) Geomagnetic index 6.7 hours before the computation
.dd (1,1) Day number since Jan 1., days
.f (1,1) Daily 10.7 cm solar flux (e-22 watts/m^2/cycle/sec)
.fHat (1,1) 81-day mean of f (e-22 watts/m^2/cycle/sec)
.fHat400 (1,1) fHat 400 days before computation date
.lat (1,1) Latitude of computation point + north (deg)
.lng (1,1) Longitude of computation point + east (deg)
.mm (1,1) Greenwich mean time from 0000 GMT, minutes
.yr (1,1) Year
.z (1,1) Geometric altitude (km)
or
.jD (:) Julian date
.rECI (3,:) ECI position vector
.aP (1,1) Geomagnetic index 6.7 hours before the computation
.f (1,1) Daily 10.7 cm solar flux (e-22 watts/m^2/cycle/sec)
.fHat (1,1) 81-day mean of f (e-22 watts/m^2/cycle/sec)
.fHat400 (1,1) fHat 400 days before computation date
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Outputs
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rho (1,:) Density (kg/m^3)
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AerospaceUtils: AtmosphericCalculations/AtmDens2 AerospaceUtils: AtmosphericCalculations/AtmJ70 Common: Graphics/Plot2D Common: Time/Date2JD Common: Time/JD2DN Math: Linear/Mag SC: Environs/SolarFluxPrediction SC: Ephem/GMSTime
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