Atmospheric heating by solar EUV radiation

Details Atmospheric heating by solar EUV radiation Atmospheric heating by solar EUV radiation

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.2266s&link_type=abstract

Journal of Geophysical Research, vol. 80, June 1, 1975, p. 2266-2276.

Physics

2

Atmospheric Models, Diurnal Variations, Far Ultraviolet Radiation, Ionospheric Heating, Solar Radiation, F Region, Gas Heating, Midlatitude Atmosphere, Particle Collisions, Photoionization, Thermodynamic Efficiency, Vertical Distribution

Scientific paper

A diurnal model of the mid-latitude ionospheric R region is used to calculate the diurnal variation of the neutral gas heating rates and neutral gas heating efficiency for conditions similar to those over Millstone Hill on March 23-24, 1970. The calculations show that the absorbed solar EUV (wavelength less than or equal to 1025 A) energy is almost equally split between photoelectrons and ion pair production. Photoelectrons heat the ambient electron gas by Coulomb collisions and by the quenching of certain excited ion species, whereas the ion gas is primarily heated by collisions with hot electrons and by chemical reactions. Heating processes above 300 km, between 170 and 300 km, and below 170 km are identified.

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