Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62.1437v&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 16, p. 1437-1448.
Physics
20
Scientific paper
Recent multiwavelength observations, modelling results and theoretical developments indicate the importance of twisted magnetic configurations in solar active regions (ARs) in the initiation of coronal mass ejections (CMEs). Through multiwavelength analysis of a few representative events we make an attempt to provide constraints for CME models. The two events presented here in detail start with the expansion of sigmoids (S- or inverse S-shaped loops) observed in soft X-rays. Both events (on 25 October /1994 and 14 October /1995) occurred before the launch of the SOHO spacecraft, but indirect evidences (i.e. signatures of an outward propagation traced up to /~20 solar radii and an associated magnetic cloud) suggest that both of them were related to CMEs. We show evidence that sigmoids are the coronal manifestations of twisted magnetic flux tubes, which start expanding presumably due to a loss of equilibrium. It is noteworthy that the analysed CMEs occurred in a complex (not simply bipolar) magnetic environment and in all cases we found evidences of the interaction (magnetic reconnection) with the surrounding fields. We propose a scenario for sigmoid expansion related CME events and suggest that twisted magnetic configurations are good candidates for being source regions of CMEs.
Aulanier Guillaume
Démoulin Pascal
Lopez-Fuentes M.
Mandrini Cristina Hemilse
Manoharan Periasamy K.
No associations
LandOfFree
Initiation of CMEs: the role of magnetic 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 Initiation of CMEs: the role of magnetic twist, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Initiation of CMEs: the role of magnetic twist will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1613478