Direct measurement of hydrogen density at exobase level and exospheric temperatures from Lyman alpha line shape and polarization. I - Physical background and first results on day side

Details Direct measurement of hydrogen density at exobase level and exospheric temperatures from Lyman alpha line shape and polarization. I - Physical background and first results on day side Direct measurement of hydrogen density at exobase level and exospheric temperatures from Lyman alpha line shape and polarization. I - Physical background and first results on day side

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.2247b&link_type=abstract

Journal of Geophysical Research, vol. 80, June 1, 1975, p. 2247-2265. Centre National d'Etudes Spatiales

Physics

10

Density Measurement, Exosphere, Hydrogen Atoms, Lyman Alpha Radiation, Satellite Observation, Temperature Measurement, Atmospheric Temperature, D-2 Satellites, Daytime, Gas Density, Geocoronal Emissions, Line Shape, Optical Polarization, Polarization Characteristics

Scientific paper

Measurements of the polarization and line shape of the Lyman alpha hydrogen geocoronal emission obtained on board the D2A Tournesol satellite are compared with theoretical predictions based on the use of Kockarts-Nicolet (1963) profiles. It is shown that, on the day side, the polarization and the reduction factor are independent of the solar radiation flux, and depend on the local conditions near the exobase. Consequently, measurements of these parameters can be used to evaluate the day-side concentrations at 500 km as well as the corresponding exospheric temperatures.

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