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Path: AerospaceUtils/AtmosphericCalculations
% Computes the atmospheric density using Jacchia's 1970 model.
Type AtmJ70 for demo.
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Form:
[rho, nHe, nN2, nO2, nO, tZ, eM] = AtmJ70( d )
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Inputs
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d (:) Data structure
.aP Geomagnetic index 6.7 hours before the computation
.dd Day number since Jan 1., days
.f Daily 10.7 cm solar flux (e-22 watts/m^2/cycle/sec)
.fHat 81-day mean of f (e-22 watts/m^2/cycle/sec)
.fHat400 fHat 400 days before computation date
.lat Latitude of computation point + north (deg)
.lng Longitude of computation point + east (deg)
.mm Greenwich mean time from 0000 GMT, minutes
.yr Year
.z Geometric altitude (km)
or
.jD Julian date
.rECI ECI position vector
.aP Geomagnetic index 6.7 hours before the computation
.f Daily 10.7 cm solar flux (e-22 watts/m^2/cycle/sec)
.fHat 81-day mean of f (e-22 watts/m^2/cycle/sec)
.fHat400 fHat 400 days before computation date
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Outputs
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rho (:) Density (g/cm^3)
nHe (:) Number density of helium
nN2 (:) Number density of nitrogen
nO2 (:) Number density of oxygen
nO (:) Number density of monatomic oxygen
tZ (:) Temperature
eM (:) Mean molecular mass
See also SolarFluxPrediction.
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Reference: Models of the Earth's Atmosphere (90 to 2500 kM) NASA SP-8021.
Roberts, C.E. Jr, "An Analytic Model for Upper Atmosphere
Densities Based Upon Jacchia's 1970 Models", Celestial Mechanics
Vol. 4, 1971, pp. 368-377.
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AerospaceUtils: AtmosphericCalculations/BaromExp AerospaceUtils: AtmosphericCalculations/DiffusionExp Common: Graphics/Plot2D Common: Time/JD2DN Math: Linear/Mag Math: Trigonometry/ACosD SC: Ephem/SunV1
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