Computer Science – Sound
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2193m&link_type=abstract
Journal of Geophysical Research, vol. 81, May 1, 1976, p. 2193-2199.
Computer Science
Sound
5
Electron Beams, Plasma Waves, Plasma-Particle Interactions, Whistlers, Electron Guns, Frequency Response, Particle Motion, Pitch (Inclination), Rocket Sounding, Wave Propagation
Scientific paper
Observations of whistler-mode waves associated with beams of electrons injected into the ionosphere are reported. The measurements are from the plasma-wave experiments carried on the Electron Echo 2 sounding rocket launched on September 24, 1972. Over 2000 electron injections were made with durations of 8 ms and 64 ms and pitch angles from 0 to 180 deg. The electric field receivers carried on the ejected nose cone observed strong whistler waves in the range from less than 100 kHz up to the electron cyclotron frequency of 1400 kHz. The whistler characteristics fall into four distinct types depending on pitch angle and gun energy. Both frequency and amplitude showed strong dependence on time from the start of the pulse and pitch angle. Cases of enhancement at the leading edge of a gun pulse, growth during a pulse, and echoes after the end of a pulse were all observed.
Cartwright D. G.
Kellogg Paul J.
Monson Steven J.
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