K-9 M-40号機による電離層光電子の測定

概要

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Photoelectrons of the energy between 3 and 30 eV in the ionosphere were measured by the electron spectrometer aboard the sounding rocket, K-9 M-40, flown from Uchinoura, Japan, on September 20, 1972, 1400 JST. The electron spectrometer, surrounded by a high-permeability metal, was composed of a collimator, a hemispherical electrostatic analyzer, and a channel electron multiplier. The experiment was successful only between the altitudes of 160 and 315 km in the ascent of the rocket. The obtained energy spectra of photoelectrons, however, show some interesting fine structures, such as a hump or a shoulder between 6 and 7 eV, and a few humps between 22 and 27 eV which were interpreted as peaks reflecting primary photoelectrons through the ionization of atomic oxygen and molecular nitrogen by He II 304 Å of solar XUV.
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