Abstract
Recently a ram source of N2 Lyman‐BirgeHopfield (LBH) emission has been reported on S3‐4 satellite. An investigation of likely chemical processes responsible has identified a gas phase reaction involving ram atmosphere and the ram‐side cloud of gas leading the satellite. The process produces large quantities of fast N that impinge on low‐altitude spacecraft. Subsequent surface recombination produces excited N2 which results in the emission with predictions of altitude variation similar to that measured by other investigators.
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