Statistics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh31b..03f&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH31B-03
Statistics
7509 Corona, 7513 Coronal Mass Ejections (2101), 7519 Flares, 7524 Magnetic Fields, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
To probe the magnetic causes of CMEs, we have examined three types of magnetic measures: size, twist and total nonpotentiality (or total free magnetic energy) of an active region. Total nonpotentiality is roughly the product of size times twist. For predominately bipolar active regions, we have found that total nonpotentiality measures have the strongest correlation with future CME productivity (~ 75% prediction success rate), while size and twist measures each have a weaker correlation with future CME productivity (~ 65% prediction success rate) (Falconer, Moore, &Gary, ApJ, 644, 2006). For multipolar active regions, we find that the CME-prediction success rates for total nonpotentiality and size are about the same as for bipolar active regions. We also find that the size measure correlation with CME productivity is nearly all due to the contribution of size to total nonpotentiality. We have a total nonpotentiality measure that can be obtained from a line-of-sight magnetogram of the active region and that is as strongly correlated with CME productivity as are any of our total-nonpotentiality measures from deprojected vector magnetograms. We plan to further expand our sample by using MDI magnetograms of each active region in our sample to determine its total nonpotentiality and size on each day that the active region was within 30 degrees of disk center. The resulting increase in sample size will improve our statistics and allow us to investigate whether the nonpotentiality threshold for CME production is nearly the same or significantly different for mutipolar regions than for bipolar regions. In addition, we will investigate the time rates of change of size and total nonpotentiality as additional causes of CME productivity. This work was funded by NSF through its Solar Terrestrial Research and SHINE Programs and by NASA through its LWS TR&T Program and its Solar and Heliospheric Physics SR&T Program.
Falconer David
Gary Allen
Moore Randy
No associations
LandOfFree
Probing the Magnetic Causes of CMEs: Free Magnetic Energy More Important Than Either Size Or Twist does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Probing the Magnetic Causes of CMEs: Free Magnetic Energy More Important Than Either Size Or Twist, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Probing the Magnetic Causes of CMEs: Free Magnetic Energy More Important Than Either Size Or Twist will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-968004