Abstract
Rocket (Underwood and Muney, 1967) and satellite observations of 2–8 Å X-ray emissions indicate that the solar eclipse of May 20, 1966, occurred during a period in which the Sun was moderately active. The Goddard Space Flight Center conducted a series of small sounding rocket experiments to measure the ionospheric D-region electron density profile during successive stages of the eclipse. Compared to the uneclipsed profile, an order of magnitude reduction is observed in the D-region profile obtained near totality. From the electron density measurements together with the X-ray spectral data of Underwood and Muney it is concluded that on May 20, 1966, 2–8 Å X-rays were not the dominant source of D-region ionization below approximately 80 km.
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