On the problem of geoeffectiveness of sporadic phenomena on the sun

Details On the problem of geoeffectiveness of sporadic phenomena on the sun On the problem of geoeffectiveness of sporadic phenomena on the sun

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36.1015e&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 36, Oct. 1988, p. 1015-1023.

Physics

14

Bow Waves, Current Sheets, Geomagnetism, Solar Terrestrial Interactions, Sudden Storm Commencements, Filaments, Shock Waves, Solar Flares, Sunspots, Time Dependence, Wind Velocity

Scientific paper

It is shown that storm sudden commencements (SSCs) are caused mainly by flares of importance 2F and higher (i.e., powerful flares) and active filaments (AF). A correlation between the variation of the total number of SSCs plus their part associated with powerful flares, covering a 1-year period, and the variation of Wolf numbers over a cycle of solar activity, is found, as well as an anticorrelation of the variation of the parts of SSCs which are produced by active filaments. It is shown that shock waves that are triggered by flares and AFs propagate preferentially along the heliospheric current sheet (HCS); this seems to be caused by a violation of the conditions for excitation of a bow shock by a transient beyond the confines of the HCS.

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