Physics – Plasma Physics
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106.6043m&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue A4, p. 6043-6058
Physics
Plasma Physics
6
Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Waves And Instabilities
Scientific paper
We report the results of an investigation of waves observed by the Polar spacecraft at high altitudes and latitudes and at frequencies just above the cyclotron frequency. These observations are made frequently when the spacecraft is over the polar cap as well as near the dayside cusp and near the nightside auroral region, and observations are made for ratios of plasma frequency to cyclotron frequency, fp/fc~1. Using the six-channel high-frequency waveform receiver (HFWR) on board the spacecraft, which can provide three-axis electric and three-axis magnetic field measurements, we attempt to identify the wavemode of these emissions and investigate possible source mechanisms including low-energy electron beams. We further observe electromagnetic emission associated with upper hybrid waves near and within the plasmasphere. This emission is consistent with both Z and O modes.
Gurnett Donald A.
Menietti Douglas J.
Pickett Jolene S.
Scudder Jack D.
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