The thermosphere of Titan

Details The thermosphere of Titan The thermosphere of Titan

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89...85f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 85-90.

Physics

23

Atmospheric Temperature, Satellite Atmospheres, Thermosphere, Titan, Atmospheric Density, Heat Transfer, Mesopause, Solar Heating, Space Plasmas, Saturn, Satellites, Titan, Atmosphere, Thermosphere, Thermal Properties, Diurnal Variations, Vertical Structure, Calculations, Techniques, Models, Equations Of Heat, Hydrostatics, Temperature, Density, Mesopause, Dynamics, Heating, Lyman Alpha Radiation, Hydrocarbons, Precipitation, Electrons, Conduction, Cooling, Exosphere, Amplitude, Time Scale

Scientific paper

The vertical structure of Titan's thermosphere is calculated down to the mesopause as a function of local time based on Voyager 1 occultation data. The thermal time scales that characterize the diurnal behavior of the thermosphere are discussed, the input model atmosphere used to calculate the temperature profile is presented, and the dominant heating and cooling mechanisms in the thermosphere are examined. The temperature profiles obtained by integrating the heat transfer equation with and without electron heating are presented and discussed. The implications that derived exospheric temperatures have for the neutral hydrogen torus are investigated. The diurnal exospheric temperature is unlikely to exceed 225 K, averages between 187 and 197 K, and has a variational amplitude of 28 K or less. The vertical extent of the hydrogen cloud is too large to be explained in terms of simple thermal escape of hydrogen from the exosphere.

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