Abstract

Observations of the electron density, electron temperature, and ion temperature were made over the height range 240–750 km vertically above Millstone Radar Observatory on July 19–21, 1963. The technique employed for these measurements is the incoherent backscatter method. The eclipse occurred on the afternoon of July 20 and caused a large rapid decrease in the electron temperature at all heights and a subsequent recovery. The ion temperature was seen to change at all heights almost equally rapidly, though by a smaller amount. These changes in temperature caused a rapid reduction in the value for the diffusive equilibrium scale height. As a consequence, ionization moved downward and the density at hmax increased, though at altitudes above 425 km it decreased. The total electron content of the region under study was about 7×1012 electrons/cm3 at the commencement of the event but had declined to about 6×1012 electrons/cm2 by the time point of last contact was reached.

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