AtmJ70:

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
   ------
   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

   -------
   Outputs
   -------
   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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Children:

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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