Occurrence Pattern of Geomagnetic Storms During the Recent Four Solar Cycles (P3)

Details Occurrence Pattern of Geomagnetic Storms During the Recent Four Solar Cycles (P3) Occurrence Pattern of Geomagnetic Storms During the Recent Four Solar Cycles (P3)

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..95a&link_type=abstract

2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe

Astronomy and Astrophysics

Astrophysics

Scientific paper

Powerful and unsteady magnetic field spewing away from the active regions of the Sun is known to produce remarkable transient interplanetary disturbances and geomagnetic storms. Long-term trend with 11-year cycle is known to be the dominant periodicity in the sunspots, which are areas of strong magnetic field and tend to influence the geomagnetic activity. Due to the abrupt release of magnetic energy associated with these spots, large geomagnetic storms are experienced at the earth following the earth- directed coronal mass ejections (CMEs) of huge bubbles of plasma and magnetic field, emanating from the solar corona. The immediate manifestation of the interplanetary shocks is seen on the ground magnetic records as an abrupt increase in the northward component of the earth’s magnetic field. Subsequently, the processes of energy transfer from the solar wind to the magnetosphere-ionosphere system under favorable interplanetary conditions give rise to the main phase of the geomagnetic storm. Measurements of the geomagnetic field variations from low latitudes form highly reliable base to understand the energy influx through the Sun- Earth interactive processes. In contrast to the systematic linear trend seen in the sunspot activity and the storm occurrence pattern observed during the period 1900 to 1965, for almost 7 solar cycles, geomagnetic activity has exhibited multiple peak signatures during the recent cycles. Though the configuration of the interplanetary magnetic field is a dominant part of the coupling process, storm manifestation is not a simple phenomenon. Highly modulating features observed in the storm development pattern during the solar cycles 20-23 will be discussed on the basis of the observed geomagnetic field variations recorded at equatorial and low latitude locations in India and the possible influences of solar wind and interplanetary characteristics.

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