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Abstract
Context. During solar flares a large number of charged particles are accelerated to high energies, but the exact mechanism responsible for this is, so far, still unclear. Acceleration in collapsing magnetic traps is one of the mechanisms proposed.
Aims. In the present paper we want to extend previous 2D models for collapsing magnetic traps to 3D models and to 2D models with shear flow.
Methods. We use analytic solutions of the kinematic magnetohydrodynamic (MHD) equations to construct the models. Particle orbits are calculated using the guiding centre approximation.
Results. We present a general theoretical framework for constructing kinematic MHD models of collapsing magnetic traps in 3D and in 2D with shear flow. A few illustrative examples of collapsing trap models are presented, together with some preliminary studies of particle orbits. For these example orbits, the energy increases roughly by a factor of 5 or 6, which is consistent with the energy increase found in previous 2D models.
Original language  English 

Pages (fromto)  14611468 
Number of pages  8 
Journal  Astronomy & Astrophysics 
Volume  508 
Issue number  3 
DOIs  
Publication status  Published  Dec 2009 
Keywords
 Sun: corona
 Sun: flares
 Sun: activity
 Sun: magnetic fields
 Sun: Xrays, gamma rays
 SOLARFLARE/CME EVENTS
 FIELD LINE SHRINKAGE
 TEST PARTICLE ORBITS
 ELECTRON ACCELERATION
 GEOSYNCHRONOUS OBSERVATIONS
 CHARGEDPARTICLES
 ENERGY PARTITION
 RECONNECTION
 SIMULATIONS
 INJECTIONS
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 2 Finished


Solar&Magnetospheric Plasma Theory PP/E1: Solar and Magnetospheric Plasma Theory
Neukirch, T., Hood, A. W., Parnell, C. E., Priest, E., Roberts, B. & Wright, A. N.
1/04/07 → 31/03/12
Project: Standard