Solar magnetic polarity dependency of geomagnetic storm seasonal occurrence

Details Solar magnetic polarity dependency of geomagnetic storm seasonal occurrence Solar magnetic polarity dependency of geomagnetic storm seasonal occurrence

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11606101o&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A6, CiteID A06101

Astronomy and Astrophysics

Astrophysics

1

Magnetospheric Physics: Magnetic Storms And Substorms (4305, 7954), Solar Physics, Astrophysics, And Astronomy: Solar Activity Cycle (2162), Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Interplanetary Physics: Interplanetary Magnetic Fields, Space Weather: Magnetic Storms (2788)

Scientific paper

For nearly a century it has been known that the tendency for geomagnetic activity is, on average, higher at the equinoxes than at the solstices. Previous studies on semiannual geomagnetic activity were performed mainly for geomagnetic indices such as am, aa, U, and AL. Thus, we need to understand the seasonal variation of geomagnetic activity defined by the Dst index over the long term. It is also necessary to test the solar magnetic polarity dependence of geomagnetic activity. This paper is a statistical analysis of the geomagnetic storms defined by the Dst index. Our storm data consists of two sets of storm data for 5 years at each solar minimum during the four solar cycles (19-22) from 1962 through 1998 for two of each solar magnetic polarity. The storms are divided into two groups defined by Dst index (Dst(min) < -50 nT, ∣Dst∣ > 70 nT; Dst(min) < -50 nT, ∣Dst∣ > 90 nT). Monthly occurrences of these storms are compared. Storms of ∣Dst∣ > 90 nT and of ∣Dst∣ > 70 nT occurred 153 and 238 times, respectively, during the testing periods. Storms occurred more frequently during the spring and fall seasons for all solar cycle minima, regardless of solar magnetic polarity.

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