Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa11a0300n&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA11A-0300
Physics
7513 Coronal Mass Ejections (2101)
Scientific paper
Some intense geomagnetic storm activities during the past four solar cycles, 1957-2001 have been analyzed. It was discovered that these selected geomagnetic storm events analyzed, have stronger intensity during the maximum solar activity cycle and the intensity is weaker during the minimum solar activity. It is evident from our results that the yearly intense geomagnetic storm, strongly correlate with the 11-year sunspot cycle. The monthly variations of sunspots during the maximum and minimum solar activity depict no strong correlation between the two phases. It was suggested that most of these geomagnetic storms analyzed were associated with Coronal Mass Ejections (CMEs). It is also noted that variation of large storm events depicts a kind of variation which peaks around June and September for maximum solar activity and peaks around same June and October for minimum solar activity. It was concluded that solar and geomagnetic activities are very important factors in planning and managing space missions.
Isikwue B. C.
Nneka F. N.
Okoro E. C.
Okpala K. C.
Onwuneme S. E.
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