Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..745s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 35, June 1987, p. 745-747, 749-752.
Physics
16
Extremely Low Frequencies, Polar Regions, Radio Emission, Antarctic Regions, Auroral Zones, Hiss, Narrowband
Scientific paper
The occurrence distributions of narrow-banded ELF emissions over the southern polar region have been studied statistically. It is found that emissions mostly occurred in the evening 17-24 MLT sector and in the region of 65-75 deg invariant latitude associated with V-shaped VLF hiss emissions. The emissions are correlated with disturbed geomagnetic activity, and the occurrence region shifts to lower latitude in association with increased geomagnetic activity. It is also found that emissions maximize during austral winter season, from April to July. The emission frequencies are strongly dependent on the satellite's altitude. These results suggest that narrow-banded ELF emissions are excited in the topside ionosphere by upflowing ion or downflowing electron fluxes, and that the growth rate strongly depends on the ambient ellectron density. The relation betweenthe emissions observed by the satellite and on the ground is also discussed.
Saito Hiroki
Sato Natsuo
Yoshino Takeo
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