Physics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.5867w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, May 1, 1986, p. 5867-5872. NASA-USAF-supported research.
Physics
59
Filaments, Interplanetary Medium, Magnetic Clouds, Magnetic Effects, Solar Corona, Stellar Mass Ejection, Plasma Clouds, Solar X-Rays, Statistical Analysis, Temporal Distribution
Scientific paper
Evidence is presented that an interplanetary magnetic cloud preceding an interaction region, observed at earth on January 24, 1974, is associated with the eruptive filament of disparition brusque (DB) near central meridian on January 18. The DB was also associated with a long-decay soft X ray transient and a long-duration gradual-rise-and-fall radio burst. To assess whether magnetic clouds are generally associated with DBs, results from statistical testing of the relation of 33 magnetic clouds (and 33 control samples without magnetic clouds) to disappearing filaments near central meridian (approximately less than 45 deg central meridian distance) are presented. The hypothesis that magnetic cloud are the 1-AU counterparts of either eruptive filaments or the coronal mass ejections which probably accompany them is supported. The major result is that disappearing filaments occur more frequently on the days when magnetic clouds are launched than on control days, a result obtained with greater than 99 pct confidence. There is a suggestion that clouds following shocks, probably launched at times of solar flares, are not as strongly associated with disappearing filaments as are clouds launched less violently.
Hildner Ernest
Wilson Ryan M.
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