VLF goniometer observations at halley bay, Antarctica-II. Magnetospheric structure deduced from whistler observations

Details VLF goniometer observations at halley bay, Antarctica-II. Magnetospheric structure deduced from whistler observations VLF goniometer observations at halley bay, Antarctica-II. Magnetospheric structure deduced from whistler observations

Jun 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21..913s&link_type=abstract

Planetary and Space Science, Volume 21, Issue 6, p. 913-914.

Physics

3

Scientific paper

On 26 July 1967, a magnetically quiet day (Σ Kp = 12-) with high whistler activity at Halley Bay, it was found possible, by measurement of whistler nose-frequency and dispersion and the bearings of the whistler exit points, to make a detailed study of the magnetospheric structure associated with the whistler ducts. During the period 0509-2305 UT most of the exit points of whistlers inside the plasmasphere were situated along a strip about 100km wide passing through Halley Bay in an azimuthal direction 30°E of N between 57° and 62° invariant latitude. A mechanism which can give rise to such a well-defined locus which co-rotates with the Earth is not clear. Nevertheless, it does appear that the locus coincides with the contour of solar zenith angle 102° at 1800 UT 25 July. This was also the time of occurrence of a sub-storm and it is suggested that the magnetospheric structure was initiated by proton precipitation along the solar zenith angle 102° contour. At mid-day knee-whistlers observed outside the plasmapause had exit points which were closely aligned along an L-shell at an invariant latitude of 62.5°. They exhibited a marked variation (~ 3:1) in electron tube content over about 12° of invariant longitude and a drift of about 8 msec-1 to lower L-shells. Throughout the period of observation the plasmapause lay about 2° polewards of the mean position found by Carpenter (1968) for moderately disturbed days.

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