hapsira.core.earth_atmosphere.jacchia

Low-level calculations for the Jacchia77 atmospheric model.

Given an exospheric temperature, Jacchia77 returns model atmospheric altitude profiles of temperature, the number densities of N2, O2, O, Ar, He, H, the sum thereof, and the molecular weight.

For altitudes of 90 km and above, we use the 1977 model of Jacchia [Ja77]. H-atom densities are returned as non-zero for altitudes of 150 km and above if the maximum altitude requested is 500 km or more.

References

Ja77 L. G. Jacchia, “Thermospheric Temperature, Density

and Composition: New Models,” SAO Special Report No. 375 (Smithsonian Institution Astrophysical Observatory, Cambridge, MA, March 15, 1977).

Fortran Implementation: https://ccmc.gsfc.nasa.gov/pub/modelweb/atmospheric/jacchia/jacchia-77/

Module Contents

hapsira.core.earth_atmosphere.jacchia.pi2

hapsira.core.earth_atmosphere.jacchia.wm0 = 28.96

hapsira.core.earth_atmosphere.jacchia.wmN2 = 28.0134

hapsira.core.earth_atmosphere.jacchia.wmO2 = 31.9988

hapsira.core.earth_atmosphere.jacchia.wmO = 15.9994

hapsira.core.earth_atmosphere.jacchia.wmAr = 39.948

hapsira.core.earth_atmosphere.jacchia.wmHe = 4.0026

hapsira.core.earth_atmosphere.jacchia.wmH = 1.0079

hapsira.core.earth_atmosphere.jacchia.qN2 = 0.7811

hapsira.core.earth_atmosphere.jacchia.qO2 = 0.20955

hapsira.core.earth_atmosphere.jacchia.qAr = 0.009343

hapsira.core.earth_atmosphere.jacchia.qHe = 5.242e-06

hapsira.core.earth_atmosphere.jacchia.R0 = 6356.766

hapsira.core.earth_atmosphere.jacchia.R = 8314.32