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	Author	Klein K-L, Masson S, Bouratzis C, Grechnev V, Hillaris A, Preka-Papadema P,
	Title	The relativistic solar particle event of 2005 January 20: origin of delayed particle acceleration			Type	Journal Article
	Year	2014	Publication	Astronomy & Astrophysics	Abbreviated Journal	0004-6361
	Volume	572	Issue		Pages	A4-A4
	Keywords
	Abstract	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 during the particularly well observed 2005 Jan 20 event. This investigation focusses on the post-impulsive flare phase, where a second peak was observed in the relativistic proton time profile by neutron monitors. This time profile is compared in detail with UV imaging and radio spectrography over a broad frequency band from the low corona to interplanetary space.It is shown that the late relativistic proton release to interplanetary space was accompanied by a distinct new episode of energy release and electron acceleration in the corona traced by the radio emission and by brightenings of UV kernels. These signatures are interpreted in terms of magnetic restructuring in the corona after the CME passage. We attribute the delayed relativistic proton acceleration to magnetic reconnection and possibly turbulence in large- scale coronal loops. While type II radio emission was observed in the high corona, no evidence of a temporal relationship with the relativistic proton acceleration was found.
	Programme	227
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	Address
	Corporate Author				Thesis
	Publisher	EDP Sciences	Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0004-6361	ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	yes
	Call Number				Serial	5829
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