Initiation and Evolution of CMEs from Helmet Streamers

Details Initiation and Evolution of CMEs from Helmet Streamers Initiation and Evolution of CMEs from Helmet Streamers

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh31a..04l&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH31A-04

Physics

2164 Solar Wind Plasma, 7509 Corona, 7513 Coronal Mass Ejections (2101), 7524 Magnetic Fields

Scientific paper

A traditional picture for CME eruptions is that the closed magnetic fields underneath a helmet streamer are destabilized to produce a CME. At the tip of the streamer belt is the heliospheric plasma sheet (HPS) which is characterized by slow, dense and cold solar wind. An important point, missed by early CME observations, is that CMEs disrupting the streamer belt and moving through the HPS would be distorted into a concave-outward shape by the interaction with the HPS. For the first time, the interaction between CMEs and the preexisting HPS is clearly imaged by SECCHI and LASCO from the Sun out to several tens of solar radii. The 31 December 2007 CME first appears as a bulge swelling from the base of a streamer and pushing EUV plumes aside, consistent with the traditional scenario for CME initiation; the CME then quickly becomes concave-outward owing to the interaction with the preexisting HPS. The streamer reforms after the CME but seems a little displaced. A similar picture is observed for the 5 September 2005 CME. The CME source regions are underneath the streamer belt as revealed by the PFSS modeled coronal fields; an MHD model using the observed photospheric magnetic fields as input gives a bi-modal ambient solar wind, consistent with the observed concave-outward shape. We also discuss deflection flows ahead of the CMEs and how CMEs regulate the global field configuration of the Sun based on the observations. These results are important for understanding the complete picture of CME initiation and propagation.

Affiliated with

Also associated with

No associations

Rating

Initiation and Evolution of CMEs from Helmet Streamers 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 and Evolution of CMEs from Helmet Streamers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Initiation and Evolution of CMEs from Helmet Streamers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1399394