Abstract
Measurements made with a retarding potential analyzer on a Nike-Tomahawk rocket during the totality of the solar eclipse over Wallops Island, Virginia, showed definite evidence for the existence of photoelectrons from the conjugate hemisphere. Photoelectrons are observed in the altitude range of 120–260 km. The observed flux in the energy range of 2–30 eV is relatively constant above about 200 km, but decreased below that altitude. The flux of 5-eV energy electrons above 200 km altitude is about 10 7 el. cm −1sec −1eV −1. Higher energy electrons were also observed and it is possible that the energy content of these observed fluxes of conjugate point photoelectrons is sufficient to maintain the observed electron densities and temperatures during the total eclipse.
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