ELF-VLF noise emissions at latitudes of the daytime polar cusp

Details ELF-VLF noise emissions at latitudes of the daytime polar cusp ELF-VLF noise emissions at latitudes of the daytime polar cusp

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ge%26ae..31...60k&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 31, Jan.-Feb. 1991, p. 60-67. In Russian.

Physics

2

Emission Spectra, Noise Spectra, Plasmapause, Polar Cusps, Daytime, Diurnal Variations, Extremely Low Frequencies, Field Aligned Currents, Ionospheric Currents, Noise Intensity

Scientific paper

Ground-based observations and observations with the Ariel-4 satellite show that ELF noise (the polar chorus) extends from the projection of the plasmapause to the daytime polar cusp, where the noise intensity drops drastically, by 30-50 dB. At ground observatories, located near the projection of this drop, the ELF-noise intensity can differ by a factor of 2-3 over distances of 250 km. Wideband irregular VLF bursts at these latitudes have a maximum of occurrence at postnoon hours and appear to be generated in the region of high-latitude field-aligned currents issuing from the ionosphere.

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