Auroral hiss on the ground at L approximately equal to 4

Details Auroral hiss on the ground at L approximately equal to 4 Auroral hiss on the ground at L approximately equal to 4

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2387m&link_type=abstract

Journal of Geophysical Research, vol. 82, June 1, 1977, p. 2387-2390.

Physics

Auroral Absorption, Auroral Zones, Ground Stations, Hiss, Radio Reception, Solar Activity Effects, Diurnal Variations, Ionospheric Propagation, Polar Cap Absorption, Sunspots, Whistlers

Scientific paper

Auroral hiss is rarely detected at subauroral-zone ground stations, but during the 4-month period January to April 1976 it became very prevalent in the wide-band audio-frequency synoptic whistler records at Farewell, Alaska (L = 4.2). A possible reason for this is that in the normal reduction and retreat of auroral zone effects to higher latitudes at sunspot minimum the reduction in the particle precipitation which causes auroral absorption is greater than that in the softer precipitation which causes auroral hiss. The occurrence of auroral hiss at Farewell showed, at 21 hours LMT (local magnetic time), the same strong diurnal peak found at auroral zone and polar cap stations. The low-frequency cutoff of auroral hiss on the ground is also discussed.

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