Four-beam measurements of ionospheric structure with the MU radar during the low-latitude auroral event of 20-23 October 1989

Details Four-beam measurements of ionospheric structure with the MU radar during the low-latitude auroral event of 20-23 October 1989 Four-beam measurements of ionospheric structure with the MU radar during the low-latitude auroral event of 20-23 October 1989

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1975o&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Nov. 1991, p. 1975-1978.

Other

7

Auroras, F Region, Ionospheric Electron Density, Magnetic Storms, Radar Measurement, Tropical Regions, Geomagnetism, Incoherent Scatter Radar, Japan, Middle Atmosphere, Upper Atmosphere

Scientific paper

The MU radar was used to observe the ionospheric F-region electron density simultaneously in four oblique beams during the geomagnetic storm of 20-23 October 1989, when the first significant auroral display over Japan since 1960 was observed. The four beams, separated by about 250 km horizontally in the F region, observed drastically different behavior, with independent and extreme changes occurring on time scales of one minute during the period of peak activity, indicating a strongly structured ionosphere streaming over the radar. Cases were observed in which, simultaneously, a deep trough was seen in one beam, densities exceeding 4 x 10 exp 6/cu cm were seen in another, and a normal ionosphere was seen in a third. During the most disturbed periods the F-layer peak height appeared to rise to 800 km altitude in one beam while it remained near 500 km in another.

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