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James A. Van Allen journal, October 1955-March 1958
Page 37
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Receiver simply a vertical antenna and a "straightforward" audio amplifier of available gain 80 db. ["400 c/sec to" corrected to] 400 c/sec to 10 kc/sec. Frequencies sweep downward ([inclinarily?]) several octaves in several seconds. [sketch/picture] sketch of short whistlers, long whistlers, lightning, geomagnetic axis, lightning Order of magnitude of occurrence several/minute. --------------------------- Electron density at two earth radii ~400/cm cubed. (estimate) Very high! --->
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Receiver simply a vertical antenna and a "straightforward" audio amplifier of available gain 80 db. ["400 c/sec to" corrected to] 400 c/sec to 10 kc/sec. Frequencies sweep downward ([inclinarily?]) several octaves in several seconds. [sketch/picture] sketch of short whistlers, long whistlers, lightning, geomagnetic axis, lightning Order of magnitude of occurrence several/minute. --------------------------- Electron density at two earth radii ~400/cm cubed. (estimate) Very high! --->
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