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On the Temporal Relationship Between Coronal Mass Ejections and Flares View all abstracts by submitter

Jie Zhang   Submitted: 2000-12-21 14:26

The temporal relationship between coronal mass ejections (CMEs) and associated solar flares is of great importance to understand the origin of CMEs, but has been difficult to study due to the nature of CME detection. In this paper, we investigate this issue using LASCO (Large-Angle and Spectrometric Coronagraph) and EIT (Extreme-ultraviolet Imaging Telescope) observations combined with GOES (Geosynchronous Operational Environmental Satellites) soft X-ray observations. We present four well-observed events whose source regions are close to the limb such that we are able to directly measure the CMEs' initial evolution in the low coronal (sim 1-3 Rsun); this height range was not available in previous space-based coronagraph observations. The velocity profiles of the CMEs show that the kinematic evolution of a typical CME can be described in a three-phase scenario: the initiation phase, impulsive acceleration phase and propagation phase. The initiation phase is characterized by a slow ascension with a speed less than 80 km s-1 for a period of tens of minutes. The initiation phase always occurs before the onset of the associated flare. Following the initiation phase, the CME display an impulsive acceleration phase which coincides very well with the rise phase of the flare lasting for a few to tens of minutes. The acceleration of CMEs ceases near the time of the soft X-ray flare peak. The CMEs then undergo a propagation phase which The CMEs then undergo a propagation phase which is characterized by a constant speed or slowly decreasing in speed. Three of the four CMEs studied have an initiation phase. The acceleration rate in the impulsive phase of these three CMEs is in the range of 100 - 500 { m m s-2}. One CME (on Nov. 6, 1997, associated with an X9.4 flare) does not show an initiation phase. It has an extremely large acceleration rate of 7300 { m m s-2}. The possible causes of CME initiation and acceleration in connection with flares are explored.

Authors: Zhang, J., Dere, K.P., Howard, R.A., Kundu, M.R, White, S.M.
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Publication Status: ApJ, submitted, Dec . 2000
Last Modified: 2000-12-21 15:50
Go to main E-Print page  Plasmoid-Induced-Reconnection and Fractal Reconnection  High-sensitivity observations of solar flare decimeter radiation  Edit Entry  Download Preprint  Delete Entry 

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