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Title: Geomagnetic disturbances associated with disappearing solar filaments
Authors: Sastri, J. H
Ramesh, K. B
Rao, J. V. S. V
Keywords: Geomagnetism;Magnetic Disturbances,;Solar Terrestrial Interactions;Solar Wind;Filaments;Interplanetary Medium;Space Plasmas;Tables (Data);Time Lag
Issue Date: Jul-1985
Publisher: Springer
Citation: Solar Physics, Vol. 98, No. 1, pp. 177 - 192
Abstract: To gain insight into the origin of enhanced geomagnetic activity that is recently reported to follow the 'disparition brusque' (DB) of quiescent solar filaments, a study is made of the interplanetary plasma and magnetic field data at 1 AU, in relation to DBs over the period of January 1967 through March 1978. The investigation revealed that the 'minor' and 'major' geomagnetic disturbances that manifested within 8 days of DBs almost invariably occurred (in 28 out of the 30 events studied) in association with the passage at earth of high-speed streams in the solar wind. A majority of the streams (19 out of the 28 streams) exhibited a 27-day recurrence pattern, and, thus, the associated enhancement in geomagnetic activity (and apparently followed DBs). The date of transit of the high-speed stream at earth seems to control the delay time of the geomagnetic disturbance, rather than the size of the filament. A systematic spatial relationship between DBs and the potential solar sources of the high-speed streams (coronal holes and flares) does not appear to be present. The results point out the relevance, and prominent role of, recurrent and transient high-speed structures in the solar wind in the enhancement of geomagnetic activity that accompanies DBs.
ISSN: 0038-0938
Appears in Collections:IIAP Publications

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