Coronal jet observed by Hinode as the source of a ³He-rich solar energetic particle event

Nitta, N.V., Mason, G.M., Wiedenbeck, M.E., Cohen, C.M.S., Krucker, S., Hannah, I.G. , Shimojo, M. and Shibata, K. (2008) Coronal jet observed by Hinode as the source of a ³He-rich solar energetic particle event. Astrophysical Journal Letters, 675(2), L125-L128. (doi:10.1086/533438)

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Abstract

We study the solar source of the ³He-rich solar energetic particle (SEP) event observed on 2006 November 18. The SEP event showed a clear velocity dispersion at energies below 1 MeV nucleon⁻¹, indicating its solar origin. We associate the SEP event with a coronal jet in an active region at heliographic longitude of W50ẹg, as observed in soft X-rays. This jet was the only noticeable activity in full-disk X-ray images around the estimated release time of the ions. It was temporally correlated with a series of type III radio bursts detected in metric and longer wavelength ranges and was followed by a nonrelativistic electron event. The jet may be explained in terms of the model of an expanding loop reconnecting with a large-scale magnetic field, which is open to interplanetary space for the particles to be observed at 1 AU. The open field lines appear to be anchored at the boundary between the umbra and penumbra of the leading sunspot, where a brightening is observed in both soft and hard X-rays during the jet activity. Other flares in the same region possibly associated with ³He-rich SEP events were not accompanied by a jet, indicative of different origins of this type of SEP event.

Item Type:Articles
Keywords:Sun: Flares, Sun: Particle Emission, Sun: X-Rays, Gamma Rays
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hannah, Dr Iain
Authors: Nitta, N.V., Mason, G.M., Wiedenbeck, M.E., Cohen, C.M.S., Krucker, S., Hannah, I.G., Shimojo, M., and Shibata, K.
Subjects:Q Science > QB Astronomy
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Astrophysical Journal Letters
ISSN:2041-8205
ISSN (Online):2041-8213
Published Online:19 February 2008

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
465931Solar, stellar and cosmological plasmas: a synthesis of data, modelling and theory.Declan DiverScience & Technologies Facilities Council (STFC)ST/F002149/1P&A - PHYSICS & ASTRONOMY