Relations Among Sunspots, CMEs and Geomagnetic Storms in Solar Cycle 23

Details Relations Among Sunspots, CMEs and Geomagnetic Storms in Solar Cycle 23 Relations Among Sunspots, CMEs and Geomagnetic Storms in Solar Cycle 23

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jass...26....9r&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 26, no. 1, 009-024

Astronomy and Astrophysics

Astronomy

Solar--Terrestrial Relations, North--South Asymmetry, Coronal Mass Ejections (Cmes), Solar Activity

Scientific paper

We compare the relation among the annual distribution of sunspots, coronal mass ejections (CMEs) and geomagnetic storms and North-South asymmetry during solar cycle 23. For this purpose, we calculate correlation coefficients between (i) annual distribution and N-S asymmetry of CMEs - sunspots (ii) distribution of CMEs - occurrence number of geomagnetic storms (iii) distribution of sunspots - occurrence number of geomagnetic storms. We find that (i) the annual distribution of total CMEs has good correlation with distribution of annual average of sunspots but poor correlation with N-S asymmetry of sunspots, N-S asymmetry of CMEs has good correlation with N-S asymmetry of sunspots, (ii) total and N-S asymmetry of CMEs have poor correlation with occurrence number of geomagnetic storms, it's, however, well correlated with the classified groups of CMEs (Ap, Dst and aa indices vs. fast CMEs(v>1000 kms^{-1}), Dst index vs. Halo CMEs), and (iii) sunspot numbers and area are correlated with occurrence number of geomagnetic storms. We conclude that annual distribution of CMEs and sunspots have well correlated with geomagnetic storms, N-S asymmetry of CMEs and sunspots have poor correlated with the geomagnetic storms.

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