Volume 462, Number 3, February II 2007
|Page(s)||1121 - 1126|
|Published online||03 November 2006|
Magnetic properties of flare-CME productive active regions and CME speed*
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China e-mail: firstname.lastname@example.org
2 Sternberg Astronomical Institute (SAI), Moscow State University, Moscow 119899, Russia
Accepted: 17 September 2006
Aims.We study the properties of magnetic field of flare-coronal-mass-ejection (flare-CME) productive active regions and their statistic correlations with CME speed.
Methods.We used a sample of 86 flare-CMEs in 55 solar active regions. Four measures, including the tilt angle (Tilt), total flux (Ft), length of the strong-field and strong-gradient main neutral line (Lsg) and effective distance (dE), are used to quantify the properties of the magnetic field of flare-CME productive active regions.
Results.The results are as follows: (1) for CMEs initiating in active regions, fast CMEs tend to initiate in active regions with large Ft or large dE. (2) In flare-associated CMEs, faster CMEs tend to be accompanied by more intense flares. (3) The parameters dE, Lsg and Ft correlate well with one another, especially Ft and Lsg. (4) The occurrence of 11 slow CMEs and 1 fast CME in β type regions with Lsg far below the threshold reminds us of some exceptions to be considered when Lsg with the threshold is used to predict the CME productivity of active regions.
Key words: Sun: activity / Sun: magnetic fields / Sun: coronal mass ejections (CMEs) / Sun: flares
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.