The relativistic solar particle event of 2005 January 20 : a comparative analysis of neutron monitor observations and electromagnetic signatures of particle acceleration in the corona
Abstract
The origin of relativistic solar protons during large flare / CME events has not been uniquely identified so far. We perform a detailed comparative analysis of the time profiles of relativistic protons detected by the worldwide network of neutron monitors at Earth with electromagnetic signatures of particle acceleration in the solar corona. We illustrate this for the large particle event of 2005 January 20. The intensity-time profile of the relativistic protons derived from the neutron monitor data indicates two successive peaks. We find a remarkable similarity with the time profiles of radio emissions at different heights in the corona, comprising at least the rise and decay of the first peak in the proton intensities. We present the data and discuss them in terms of different scenarios of particle acceleration in the corona and of transport in the interplanetary magnetic field.
- Publication:
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37th COSPAR Scientific Assembly
- Pub Date:
- 2008
- Bibcode:
- 2008cosp...37.1539K