Physics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..533r&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, July 1983, p. 533-536.
Physics
11
Density (Number/Volume), Dynamics Explorer 1 Satellite, Hydrogen, Lyman Alpha Radiation, Ultraviolet Photometry, Auroras, Computerized Simulation, Exosphere, Geocoronal Emissions, Limb Brightening, Radiative Transfer
Scientific paper
The ultraviolet photometer of the University of Iowa spin-scan auroral imaging instrumentation on board Dynamics Explorer-1 has returned numerous hydrogen Lyman alpha images of the geocorona from altitudes of 570 km to 23,300 km (1.09 R sub E to 4.66 R sub E geocentric radial distance). The hydrogen density gradient is shown by a plot of the zenith intensities throughout this range, which decrease to near celestial background values as the spacecraft approaches apogee. Characterizing the upper geocorona as optically thin (single-scattering), the zenith intensity is converted directly to vertical column density. This approximation loses its validity deeper in the geocorona, where the hydrogen is demonstrated to be optically thick in that there is no Lyman alpha limb brightening. Further study of the geocoronal hydrogen distribution will require computer modeling of the radiative transfer. Previously announced in STAR as N83-20889
Craven John D.
Frank Louis A.
Rairden Richard L.
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