Exobase hydrogen density temperature from Lyman alpha absorption and polarization measurements. II - Dayside and nightside results during April 1971

Details Exobase hydrogen density temperature from Lyman alpha absorption and polarization measurements. II - Dayside and nightside results during April 1971 Exobase hydrogen density temperature from Lyman alpha absorption and polarization measurements. II - Dayside and nightside results during April 1971

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.6103e&link_type=abstract

Journal of Geophysical Research, vol. 81, Dec. 1, 1976, p. 6103-6114.

Physics

4

Geocoronal Emissions, Hydrogen, Lyman Alpha Radiation, Molecular Absorption, Polarimetry, Polarized Electromagnetic Radiation, D-2 Satellites, Data Processing, Daytime, Diurnal Variations, Gas Density, Night Sky, Oxygen Spectra

Scientific paper

The measurements of polarization and absorption of the Lyman alpha geocoronal emission discussed in this paper were carried out on board the French spacecraft D2-A Tournesol during the period from April 19 to May 2, 1971. The measurements are compared with theoretical predictions from spherical models of transfer constructed using a Knockerts-Nicolet distribution of hydrogen from 100 to 500 km and a Chamberlain distribution from 500 to 100,000 km. A hydrogen density of (10 plus or minus 2) x 10,000 atoms per cu cm at noontime near the equator was deduced from the polarization measurements. The respective midnight density was (11 plus or minus 3) x 10,000 atoms per cu cm. The midnight to midday density ratio was roughly 1.1. The intensity of the extrageocoronal Lyman alpha background, measured in a plane perpendicular to the sun-earth axis varied between 780 and 430 R.

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