HR: 14:55h
AN: SH22B-06    [PDF]
TI: Photospheric Sources of Very Fast ($>$1100 km/s) CMEs Between 1999 and 2001
AU: * Yurchyshyn, V
EM: vayur@bbso.njit.edu
AF: Big Bear Solar Observatory, 40386 North Shore Lane, Big Bear City, CA 92314 United States
AB: We identified photospheric sources for 39 very fast (faster then 1100 km/s) front-side coronal mass ejections, which occurred 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. We distinguished three different groups of active regions which are responsible for very fast CMEs: 1) Complex delta spots (delta spots with a Mt. Wilson classification of beta gamma). This group of active regions (21 events) can be represented by active regions 9393 and 9415 and 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 can be represented by active regions 8375 and 9236 and 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 (active regions 9046 and 9085). In this presentation we will discuss in detail the evolution and the type of the magnetic structures which are responsible for very fast CMEs originating from delta-configurations.
UR: http://www.bbso.njit.edu/~vayur/results.html
DE: 7513 Coronal mass ejections
DE: 7519 Flares
DE: 7524 Magnetic fields
DE: 7529 Photosphere
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting