Ionospheric disturbance and radio noise increase associated with the low-latitude aurora on 21 October 1989

Details Ionospheric disturbance and radio noise increase associated with the low-latitude aurora on 21 October 1989 Ionospheric disturbance and radio noise increase associated with the low-latitude aurora on 21 October 1989

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13...66m&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 13, no. 1, p. 66-75

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1

Auroras, F Region, Ionospheric Disturbances, Ionospheric Noise, Magnetic Disturbances, Radio Attenuation, Radio Stars, Interferometry, Japan, Plasma Waves, Radiometers

Scientific paper

Low-latitude red auroral displays were seen from the northern part of Japan on 21 October 1989. In association with this auroral event a sudden disappearance of the fringe pattern of Cas A and Cyg A, i.e. a radio star fadeout (RSF) phenomenon, was observed at 49.5 MHz with a phase-switched interferometer having a baseline of about 70 m at Tsuge, Japan. An enhancement of radio noise was also observed with a 29.98 MHz radiometer at Tsuge. The RSF occurred in the premidnight sector, being coincident with a poleward expansion of the equatorial anomaly.The small-scale ionospheric electron density irregularities causing the RSF were probably produced in association with the drift motion of the structured F-region plasma that was detected by radar observations at Shigaraki, located about 15 km west of the Tsuge station. The radio noise increase was presumably due to some radio emission related to the development of the longitudinal asymmetry of the geomagnetic disturbance field. Another radio noise increase event associated with the low-latitude aurora on 30 March 1990 is also presented.

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