Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh51c..04y&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SH51C-04
Other
2722 Forecasting, 2788 Storms And Substorms, 7513 Coronal Mass Ejections, 7519 Flares, 7524 Magnetic Fields
Scientific paper
We identified photospheric sources for 39 very fast (v > 1100 km/s) front-side coronal mass ejections that erupted between 1999 and 2001. For our study we used data on CMEs and their sources provided by the CME Catalog, SOHO spacecraft (LASCO, EIT, MDI), Big Bear Solar Observatory (Halpha, magnetograms), Mount Wilson Observatory (sunspot drawings) and Joint USAF/NOAA active region summary. Our results are as follows. We distinguished three different groups of active regions which are responsible for very fast CMEs: 1) Complex delta spots (21 events). This group of active regions is characterized by the presence of at least two large opposite polarity sunspots located close to each other. 2) Simple delta spots (8 events). A typical configuration of this type consists of one large twisted tadpole-shaped sunspot, surrounded by many small satellite-sunspots. 3) Extended magnetic regions, which consist of two adjacent decaying active regions or a new active region emerging inside a decaying active region.
Gopalswamy Nat
Yashiro Seiji
Yurchyshyn Vasyl
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