A comparison of solar activity during the decline of several solar cycles

Details A comparison of solar activity during the decline of several solar cycles A comparison of solar activity during the decline of several solar cycles

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16r..27s&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 16, no. 9, p. (9)27-(9)36

Computer Science

4

Comparison, Solar Activity, Solar Cycles, Sun, Geomagnetism, Interplanetary Space, Periodic Variations, Planetary Magnetospheres, Solar Terrestrial Interactions, Sunspot Cycle

Scientific paper

This review summarizes the general characteristics of solar activity during the declining part of solar cycles and compares the behavior of the Sun during several last cycles. Different characteristics of solar activity are considered and tentative reasons for their different behavior in different cycles are suggested. The activity decline is usually very irregular, characterized by quiet periods interrupted by temporary bursts of activity. These bursts can be quite impressive: actually, as a rule, the most outstanding events of solar activity do not occur at the cycle maximum, but shortly before it, or a few years later. The duration of quiet periods between activity enhancements increases as the cycle declines, but even close to the solar minimum one may still encouter quite interesting flare events. From the point of view of solar-terrestrial relations, these late events are particularly favorable, because their effects in interplanetary space and in planetary magnetospheres can be followed much easier than during high solar activity: one can uniquely ascribe the observed consequencies in space to their isolated sources on the Sun.

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