Severe ionospheric disturbances caused by the sudden response of evening subequatorial ionospheres to geomagnetic storms

Details Severe ionospheric disturbances caused by the sudden response of evening subequatorial ionospheres to geomagnetic storms Severe ionospheric disturbances caused by the sudden response of evening subequatorial ionospheres to geomagnetic storms

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8611335t&link_type=abstract

Journal of Geophysical Research, vol. 86, Dec. 1, 1981, p. 11335-11349.

Physics

32

Equatorial Atmosphere, Geomagnetism, Magnetic Storms, Scintillation, Sudden Ionospheric Disturbances, C Band, Diurnal Variations, Extremely High Frequencies, Japan, Magnetic Flux, Magnetic Signatures, Synchronous Satellites

Scientific paper

By monitoring C band beacon signals from geostationary satellites in Japan, anomalously strong ionospheric scintillations are observed several times between 1978 and 1980. It is noted that these severe scintillations occur associated with geomagnetic storms and that they accompany sudden and intense ions in ionospheric perturbations in the low-latitude region. By analyzing these phenomena, a new type of ionospheric disturbance is identified that is characterized by intensifications of equatorial anomalies and successive severe ionospheric scintillations that extend to the C band range. The events take place only during a limited local time interval after the sunset, when storm time decreases of midlatitude geomagnetic fields in the same meridian occur during the same time interval. From the viewpoint of ionospheric storms, these disturbances precede the occurrence of midlatitude negative phases and storm time depressions of equatorial anomalies to suggest that the cause of the events is different from disturbed thermospheric circulations.

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