Computer Science – Sound
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9921361b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A11, p. 21,361-21,374
Computer Science
Sound
8
Atmospheric Sounding, Auroral Zones, Earth Ionosphere, Electric Fields, Plasma Sheaths, Rectennas, Rocket Sounding, Whistlers, Electron Energy, Harmonic Generations, Payloads, Plasma Frequencies, Spherical Antennas
Scientific paper
Combined measurements of Langmuir or broadband whistler wave intensity and lower-frequency electric field waveforms, all at 10-microsecond time resolution, were made on several recent sounding rockets in the auroral ionosphere. It is found that Langmuir and whistler waves are partically rectified in the plasma sheaths surrounding the payload and the spheres used as antennas. This sheath rectification occurs whenever the high frequency (HF) potential across the sheath becomes of the same order as the electron temperature or higher, for wave frequencies near or above the ion plasma frequency. This rectification can introduce false low-frequency waves into measurements of electric field spectra when strong high-frequency waves are present. Second harmonic signals are also generated, although at much lower levels. The effect occurs in many different plasma conditions, primarily producing false waves at frequencies that are low enough for the antenna coupling to the plasma to be resistive.
Boehm M. H.
Carlson Carl W.
Clemmons James Hart
Ergun Robert E.
McFadden James P.
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