Band-limited ELF emission burst (auroral roar)

Details Band-limited ELF emission burst (auroral roar) Band-limited ELF emission burst (auroral roar)

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.3531s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, April 1, 1985, p. 3531-3535.

Computer Science

Sound

12

Annual Variations, Auroral Spectroscopy, Auroras, Extremely Low Radio Frequencies, Magnetic Storms, Radio Emission, Antarctic Regions, Diurnal Variations, Spectral Bands, Winter

Scientific paper

A new type band-limited ELF emission burst which is closely associated with impulsive auroral hiss and auroral breakup is identified on the ground at Syowa Station (L = 6.1) in Antarctica. The ELF emissions have a center frequency of 100-350 Hz and a duration of 10-150 s, in which band-limited structures are found in frequency-time displays. In many cases the band-limited structures show falling tone with time. Most of the emissions are observed at the onset of the substorm expansion phase for the limited magnetic local time of 1700-2400 MLT and in the austral winter season of June-August. The new band-limited ELF emission burst is termed 'ELF auroral roar' because it is observed with a roaring sound through an audio speaker.

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