Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002basi...30..859k&link_type=abstract
Bulletin of the Astronomical Society of India, vol. 30, p.859-870
Astronomy and Astrophysics
Astronomy
3
Gmss, Sunspot Cycle, Solar Flares, Apdfs, Heliolatitude/Longitude. Horizontal Component Of Earth Magnetic Field (H)
Scientific paper
The effect of solar features on geospheric conditions leading to ninety nine geomagnetic storms (GMSs) with H400nT and Ap20 have been investigated using interplanetary magnetic field (IMF), solar wind plasma (SWP) and solar geophysical data (SGD) during the period 1979-99. H, X-ray solar o o flares occured within lower latitudinal zone i.e., 30 N-0-30 S, are associated with maximum number of o o GMSs. Further, 91.7% of total APDFs occured within helio-latitudinal range 30 N-030 S are associated with GMSs. No significant correlation between magnitude of GMSs is associated with different properties of H, X-ray solar flares and APDFs i.e, NOAA region, location (helio-longitude/latitude), duration and area of solar events. It is observed statistically that 77.2%, 62.8% and 68.5% GMSs are associated with H, X-ray solar flares and APDFs respectively. It is observed that coronal mass ejection (CMEs) related storm sudden commencements (SSCs) are not always associated with high speed solar wind streams (HSSWS). Associated solar activity of CME events near the Sun are eruptive prominences, long duration solar events, impulsive X-ray events, optical flares, type II and IV radio burst leading to SSCs. The travel time between the explosation on the solar disc and maximum geomagnetic activity has been observed in the range 53-114 Hrs.
Kumar Santosh
Pratap Yadav Mahendra
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