Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1285m&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A10, pp. SMP 8-1, CiteID 1285, DOI 10.1029/2001JA009223
Physics
5
Magnetospheric Physics: Solar Wind Interactions With Unmagnetized Bodies, Ionosphere: Planetary Ionospheres (5435, 5729, 6026, 6027, 6028), Planetary Sciences: Magnetic Fields And Magnetism, Magnetospheric Physics: Magnetosheath
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 the nightside auroral region and for ratios of gyrofrequency to plasma frequency, fp/fg ~ 1. We investigate the role of electron beams with E<~1 keV in the generation of these waves. Observed plasma parameters are used as input to a modification of the Waves in Homogeneous, Anisotropic Multi-component Plasmas (WHAMP) computer code to place constraints on the free energy source and growth of these waves. We conclude these waves are an indicator of the presence of low-energy electron beams and a cold electron component (E<~0.2 eV) in regions with fp/fg<~1.
Gurnett Donald A.
Menietti Douglas J.
Pickett Jolene S.
Santolik Ondrej
Scudder Jack D.
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