Lyman alpha observations of geocoronal and interplanetary hydrogen from Spacelab-1 - Exospheric temperature and density and hot emission

Details Lyman alpha observations of geocoronal and interplanetary hydrogen from Spacelab-1 - Exospheric temperature and density and hot emission Lyman alpha observations of geocoronal and interplanetary hydrogen from Spacelab-1 - Exospheric temperature and density and hot emission

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..549b&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 7, Dec. 1989, p. 549-563. Research supported by CNES and Ministry of National Educati

Physics

15

Exosphere, Geocoronal Emissions, Interplanetary Gas, Lyman Alpha Radiation, Spacelab, Thermal Emission, Hydrogen Atoms, Interplanetary Medium, Resonance Scattering, Solar Protons

Scientific paper

An analysis of Lyman-alpha zenithal observations obtained on the last day of the Spacelab-1 mission (December 7, 1983) is presented. The L-alpha emission, observed from the altitude of 250 km, was recorded along two complete orbits, with the same celestial orientations but different geographic coverage. It is shown that the L-alpha emission recorded in the zenith direction consisted of three components: (1) the main component (9000-15,000 Rayleighs), which is a well-known geocoronal emission, (2) a 100-600 R component which is the interplanetary medium emission, and (3) the so-called 'hot emission' (325 R). The hot emission was previously attributed by some authors to fast H neutrals emitting by resonance scattering of solar photons. It is demonstrated that this process is quite unlikely to explain the observed intensity. It is suggested that it could rather be the signature of solar wind protons precipitating along the polar cusp.

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