Combined stereo/Rhessi study of coronal mass ejection acceleration and particle acceleration in solar flares

Temmer, M., Veronig, A.N., Kontar, E.P. , Krucker, S. and Vrsnak, B. (2010) Combined stereo/Rhessi study of coronal mass ejection acceleration and particle acceleration in solar flares. Astrophysical Journal, 712(2), pp. 1410-1420. (doi: 10.1088/0004-637X/712/2/1410)

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Using the potential of two unprecedented missions, Solar Terrestrial Relations Observatory (STEREO) and Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI), we study three well-observed fast coronal mass ejections (CMEs) that occurred close to the limb together with their associated high-energy flare emissions in terms of RHESSI hard X-ray (HXR) spectra and flux evolution. From STEREO/EUVI and STEREO/COR1 data, the full CME kinematics of the impulsive acceleration phase up to ~4 R ☉ is measured with a high time cadence of ≤2.5 minutes. For deriving CME velocity and acceleration, we apply and test a new algorithm based on regularization methods. The CME maximum acceleration is achieved at heights h ≤ 0.4 R ☉, and the peak velocity at h ≤ 2.1 R ☉ (in one case, as small as 0.5 R ☉). We find that the CME acceleration profile and the flare energy release as evidenced in the RHESSI HXR flux evolve in a synchronized manner. These results support the "standard" flare/CME model which is characterized by a feedback relationship between the large-scale CME acceleration process and the energy release in the associated flare.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Kontar, Professor Eduard
Authors: Temmer, M., Veronig, A.N., Kontar, E.P., Krucker, S., and Vrsnak, B.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Astrophysical Journal
Published Online:15 March 2010
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
398461Acceleration, propagation and emission of energetic particles from the sun to the earthEduard KontarParticle Physics & Astronomy Research Council (PPARC)PP/C001656/1Physics and Astronomy
465931Solar, stellar and cosmological plasmas: a synthesis of data, modelling and theory.Declan DiverScience & Technologies Facilities Council (STFC)ST/F002149/1Physics and Astronomy