Physics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.2183s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A2, p. 2183-2190
Physics
4
Earth Ionosphere, Extremely Low Frequencies, Magnetic Signals, Magnetosheath, Midlatitude Atmosphere, Whistlers, Daytime, Lightning, Magnetosphere-Ionosphere Coupling, Polar Cusps
Scientific paper
Narrow-band, whistlerlike magnetic events distinguished by nearly monochromatic signals decreasing in frequency with time have been observed for the first time at midlatitudes in the ELF band. Measurements performed during September 3 to October 5, 1985 at Table Mountain, California (34.4 deg N, 117.7 deg W), show that the frequency and dispersion characteristics of these events are similar to events detected at auroral latitudes (Heacock, 1974), including a narrow-band magnetic signal monotonically decreasing in frequency from 120 to 60 Hz over a 40 s interval with a mean center frequency of approximately 90 Hz. No echoes were observed. Maximum amplitudes of the magnetic signals ranged from just above the approximately 1 pT Hz(exp -1/2) floor of the ambient background to roughly 20 pT Hz(exp -1/2). The polarization was predominantly linear in the geographic east-west direction. The midlatitude ELF whistlers reported here have a significantly lower average daily rate of occurrence than those reported for auroral latitudes. However, as with the high-latitude events, they displayed an occurrence rate that is maximum during local daytime. Following Heacock (1974), it is suggested that a possible source for these events is whistler mode lion roars occurring in field-aligned ducts of enhanced cold plasma densities in the distant magnetosheath.
Ehring D. A.
Sentman Davis D.
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