Abstract
The experiments described here were flown onAryabhata and were mainly designed to study the global distribution of suprathermal electrons, ionosphere-magnetosphere coupling, theF-region anomaly and the hydrogen geocorona. The experiments consisted of a retarding potential analyser and two ultraviolet ion chambers. The former was designed for the measurement of the flux of suprathermal electrons in the earth’s atmosphere while the latter was for measuring the intensity of the resonantly scattered hydrogen Lyman alpha (1216 A) and photoelectronically excited OI (1304 A) emissions.
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