Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415393k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15393-15397. Research supported by the U.S. Navy.
Physics
22
Ducts, Plasma Density, Plasma Frequencies, Plasmasphere, Wave Amplification, Whistlers, Atmospheric Ionization, Geomagnetism, Ogo-A
Scientific paper
Strong enhancements of whistler mode hiss emissions have been observed to correlate with plasma density enhancements in the outer plasmasphere between L = 4 and L = 6. This indicates that these density enhancements are acting as whistler mode wave ducts. The plasma density is determined from a narrow-band line near the plasma frequency. The hiss emissions generally occur below 2 kHz. The ducts consist of density enhancements of more than 40 percent. Density gradients on the sides of the ducts range from 0.10 to 0.24 el/cu cm per km. The half width of each duct is typically 250 km. The wave intensity maximizes about 15 km from the center of the duct toward the outside, i.e., the side with a negative density gradient with increasing distance. The wave intensity near the center of a duct is an order of magnitude higher than the wave intensity at the density minimum between ducts.
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