A study of quasi-periodic ELF-VLF emissions at three Antarctic stations: Evidence for off-equatorial generation?

Details A study of quasi-periodic ELF-VLF emissions at three Antarctic stations: Evidence for off-equatorial generation? A study of quasi-periodic ELF-VLF emissions at three Antarctic stations: Evidence for off-equatorial generation?

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12..139m&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 2/3, p. 139-146

Physics

8

Extremely Low Frequencies, Geomagnetic Micropulsations, Geomagnetism, Very Low Frequencies, Vlf Emission Recorders, Antarctic Regions, Earth Magnetosphere

Scientific paper

The spatial extent and temporatl behavior of quasi-periodic (QP) intensity modulations of 0.5-2 kHz ELF-VLF signals were investigated in a comparative study of data collected at the Antarctic stations of South Pole (L = 14), Halley (L = 4), and Siple (L = 4). Frequently, the waveforms of ELF-VLF signals simultaneously received at each site were identical. Although of similar frequency structure, the waveforms of the accompanying Pc3 magnetic pulsations did not show a one-to-one association. Whereas both are dayside phenomena, QP emissions occur over a smaller range of local times, and have a maximum of occurrence later in the day closer to local noon. QP emissions are identified with the periodic modulation of the electron pitch-angle distribution by the propagation of ULF compressional fast-mode waves through a region. However, contrary to previous ideas, rising-tone emissions do not represent the frequency-time signatures of such waves. In addition to generation close to the equatorial plane, we propose an additional high-latitude source of QP emissions. These emissions are associated with regions of minimum B produced by the dayside compression of the magnetosphere close to the magnetopause. Model magnetic field calculations of these minimum-B regions as a function of magnetic local time and invariant latitude are presented.

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