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The relativistic solar particle event of 2005 January 20: prompt and delayed particle acceleration View all abstracts by submitter

Alexander Hillaris   Submitted: 2014-06-10 13:46

The highest energies of solar energetic nucleons detected in space or through gamma-ray emission in the solar atmosphere are in the GeV range. Where and how the particles are accelerated is still controversial. We search for observational evidence on the acceleration region(s) by comparing the timing of relativistic protons detected at Earth and radiative signatures in the solar atmosphere. To this end a detailed comparison is undertaken of the double-peaked time profile of relativistic protons, derived from the worldwide network of neutron monitors during the large particle event of 2005 January 20, with UV imaging and radio petrography over a broad frequency band from the low corona to interplanetary space. We show that both relativistic proton releases to interplanetary space were accompanied by distinct episodes of energy release and electron acceleration in the corona traced by the radio emission and by brightenings of UV kernels in the low solar atmosphere. The timing of electromagnetic emissions and relativistic protons suggests that the first proton peak was related to the acceleration of gamma-ray emitting protons during the impulsive flare phase, as shown before. The second proton peak occurred together with signatures of magnetic restructuring in the corona after the CME passage. We attribute the acceleration to reconnection and possibly turbulence in large-scale coronal loops. While type II radio emission was observed in the high corona, there is no evidence of a temporal relationship with the relativistic proton acceleration.

Authors: Klein, K.-L.; Masson, S.; Bouratzis, C.; Grechnev, V.; Hillaris, A.; Preka-Papadema, P
Projects: None

Publication Status: Submitted to A&A
Last Modified: 2014-06-11 09:55
Go to main E-Print page  The 17 January 2005 Complex Solar Radio Event Associated with Interacting Fast Coronal Mass Ejections  Fine Structure of Metric Type-IV Radio Bursts Observed with the ARTEMIS-IV Radio Spectrograph: Association with Flares and Coronal Mass Ejections  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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