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Suppression of Active-Region CME Production by the Presence of Other Active RegionsFrom the SOHO mission s data base of MDI full-disk magnetograms spanning solar cycle 23, we have obtained a set of ~40,000 magnetograms of ~1,300 active regions, tracking each active region across the 30 degree central solar disk. Each active region magnetogram is cropped from the full-disk magnetogram by an automated code. The cadence is 96 minutes. From each active-region magnetogram, we have measured two whole-active-region magnetic quantities: (1) the magnetic size of the active region (the active region s total magnetic flux), and (2) a gauge of the active region s free magnetic energy (part of the free energy is released in the production of a flare and/or CME eruption). From NOAA Flare/CME catalogs, we have obtained the event (Flare/CME/SEP event) production history of each active region. Using all these data, we find that for each type of eruptive event, an active region s expected rate of event production increases as a power law of our gauge of active-region free magnetic energy. We have also found that, among active regions having nearly the same free energy, the rate of the CME production is less when there are many other active regions on the disk than when there are few or none, but there is no significant discernible suppression of the rate of flare production. This indicates that the presence of other active regions somehow tends to inhibit an active region s flare-producing magnetic explosions from becoming CMEs, contrary to the expectation from the breakout model for the production of CMEs.
Document ID
20090034284
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Falconer, David
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Moore, Ron
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Barghouty, Abdulnasser
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Khazanov, Igor
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 24, 2013
Publication Date
August 3, 2009
Subject Category
Solar Physics
Report/Patent Number
M09-0532
Meeting Information
Meeting: SHINE Workshop 2009
Location: Wolfville
Country: Canada
Start Date: August 3, 2009
End Date: August 7, 2009
Sponsors: National Science Foundation
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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