HR: 0830h
AN: SH51C-04    [Abstracts]
TI: Photospheric sources of very fast coronal mass ejections
AU: * Yurchyshyn, V
EM: vayur@bbso.njit.edu
AF: Big Bear Solar Observatory, 40386 North Shore Lane, Big Bear City, CA 92314 United States
AU: Yashiro, S
EM: yashiro@cdaw.gsfc.nasa.gov
AF: Catholic University of America, Washington, DC 20064,
AU: Gopalswamy, N
EM: gopals@fugee.gsfc.nasa.gov
AF: Laboratory for Extraterrestrial Physics, NASA/GSFC, Greenbelt, MD,
AB: 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.
UR: http://www.bbso.njit.edu/~vayur/
DE: 2722 Forecasting
DE: 2788 Storms and substorms
DE: 7513 Coronal mass ejections
DE: 7519 Flares
DE: 7524 Magnetic fields
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2005 Joint Assembly