Solar and geomagnetic disturbances during the declining phase of recent solar cycles

Details Solar and geomagnetic disturbances during the declining phase of recent solar cycles Solar and geomagnetic disturbances during the declining phase of recent solar cycles

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16...57w&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 16, no. 9, p. (9)57-(9)69

Computer Science

11

Coronal Holes, Geomagnetism, Magnetic Disturbances, Solar Cycles, Current Sheets, Heliosphere, Long Term Effects, Shock Waves, Stellar Mass Ejection

Scientific paper

On average, the distribution of geomagnetic disturbances over the solar activity cycle exhibits two peaks. It is commonly thought that these peaks represent two components of geomagnetic activity that have very different solar and heliospheric sources. A peak near solar maximum is associated with transient solar activity and a later peak during the declining phase is attributed to recurrent high speed streams from coronal holes. Coronal mass ejections (CMEs) are now considered to be the most important phenomenon associated with the first peak. However, the influence of such transient disturbances may also extend into the declining phase. It is becoming apparent that the coronal streamer belt and its extension as the heliospheric current sheet plays a major role in both kinds of geoactivity. For example, streamers are the source of many, if not most CMEs. During the declining phase, corotating stream interaction regions (CIRs) cause the strongest recurrent geomagnetic activity, often because CMEs cluster there. CIRs arise from interactions at the boundaries between streamers (slow wind) and coronal holes (fast wind). These aspects of geomagnetic disturbances during the declining phases of cycles are reviewed with emphasis on comparison of the present solar cycle with the previous two cycles.

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