Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh22a..08m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH22A-08
Astronomy and Astrophysics
Astrophysics
[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7954] Space Weather / Magnetic Storms
Scientific paper
A statistical study of stream interactions and CME events from January 2007 to December 2010 which result in storm and substorm activity is presented. During this solar minimum the decrease in solar activity has resulted in less geomagnetic activity. The observed activity has been from stream interaction regions (SIRs), shocks, and some interplanetary coronal mass ejections (ICMEs). Geomagnetic activity is characterized by indices derived from ground based magnetometers and a minimum Dst threshold of -30 nT is used. For each geoeffective event, we identified CMEs in the STEREO/SECCHI coronagraphs, and SIRs in the STEREO/SECCHI Heliospheric Imagers and associated lower coronal signatures in STEREO/EUVI and SDO/AIA. Subsequent CME and/or SIR signatures were identified in ACE, WIND, THEMIS, and other in-situ data when available. CME evolution in the lower corona and properties such as acceleration, speed and width were determined along with the in-situ plasma data for ICMEs. The propagation of these structures were tracked in the STEREO Heliospheric Imagers and subsequently in-situ. Geoeffectiveness, the strength and duration of geomagnetic activity, is compared with upstream solar wind conditions. In 2007 and 2008, SIRs produce most of the storms (~75% and ~78% respectively), however the strongest storms are produced by ICME and SIR interactions in 2007 and SIRs in 2008. The number of SIR driven storms drops to just below half (~46%) in 2009, and the remaining storms result from an ICME followed by an SIR (~39% and strongest storm), and ICMEs (~16%). In 2010 the number ICME driven storms markedly increase (~50%) and produce 57% of the strongest storms, while SIR driven storms continue to decrease (36%). So far in 2011, and around half of the storms are SIR driven, but ~66% of the strongest storms are driven by ICMEs. Overall, the percentage of geoeffective SIRs (observed in-situ) from 2007-2009 was 36%, 30%, and 14%, respectively, and ICMEs were geoeffective 60%, 33%, and 42% of the time.
Mays Leila M.
Sibeck David G.
St Cyr O. C.
Xie Hehu
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