Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31b1538t&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM31B-1538
Physics
[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2790] Magnetospheric Physics / Substorms
Scientific paper
The annual variation of the substorm activity during a complete solar cycle, from year 1993 to 2003, is examined. Almost 6,000 substorms were identified by an automated search engine. To examine the long-term (annual and solar cycle) variability in the substorm occurrence rate, we form a measure called the substorm number. The substorm number and peak amplitude is found to only weakly follow the solar activity measured by the sunspot number. During the years of sunspot maxima in solar cycle 23, the northern hemisphere auroral region was only moderately active. The largest substorm numbers and peak amplitudes were found during the declining solar cycle when the interplanetary high-speed streams hit the Earth. We find that the substorms last longer during the least active season (i.e. summer months). Furthermore, the substorm number and peak amplitude show much larger values for winter than for summer, which may be partly due to the fact that the maximum southward component of the interplanetary magnetic field Bsouth occurs in February and minimum in June.
Partamies N. J.
Pulkkinen Tuija I.
Snekvik K.
Tanskanen Eija I.
Viljanen Ari
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