Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..487k&link_type=abstract
Geophysical Research Letters, vol. 6, June 1979, p. 487-490. Research supported by the University of Iowa
Physics
9
Electrostatic Waves, Magnetospheric Instability, Plasma Turbulence, Resonant Frequencies, International Sun Earth Explorer 1, Linear Systems, Plasmapause, Satellite-Borne Instruments, Spectral Bands
Scientific paper
Intense electrostatic waves near the upper hybrid resonance frequency (f-UHR) have recently been detected near but beyond the plasmapause between + or -50 deg magnetic latitude at all local times. The paper shows that the electrostatic waves observed with the ISEE 1 plasma wave receiver near f-UHR are in qualitative agreement with linear theory of multicyclotron harmonic emissions. The peak amplitudes and bandwidths observed are similar to those calculated for maximum spatial growth rates. Measurements on Hawkeye of similar waves suggest that the electric field polarization is also consistent with theory. For a wide range of plasma parameters, nonconvective instability or large spatial growth rates occur within the cyclotron band encompassing the cold upper hybrid frequency.
Ashour-Abdalla Maha
Burek B. J.
Frank Louis A.
Gurnett Donald A.
Kennel Charles F.
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