Nitta, Nariaki V. and Mason, Glenn M. and Wiedenbeck, Mark E. and Cohen, Christina M. S. and Krucker, Säm and Hannah, Iain G. and Shimojo, Masumi and Shibata, Kazunari (2008) Coronal jet observed by Hinode as the source of a ^3He-rich solar energetic particle event. Astrophysical Journal Letters, 675 (2). L125-L128. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090427-153824488
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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 W50°, 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.
|Additional Information:||© 2008 The American Astronomical Society. Received 2007 December 5; accepted 2008 January 22; published 2008 February 19. We thank the Hinode, ACE, Wind, RHESSI, SOHO, and TRACE instrument teams and the NGDC for making the data available and M. DeRosa for help with the PFSS extrapolations. The SXI data have been provided by the NOAA SXI project. Hinode is a Japanese mission developed and launched by ISAS/ JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in cooperation with ESA and NSC (Norway).We acknowledge use of the LASCO CME catalog generated and maintained at the CDAW Data Center by NASA and the Catholic University of America in cooperation with the Naval Research Laboratory. This work has been supported by NASA grant NNG05GD68G and NSF grant ATM-0454408.|
|Group:||Space Radiation Laboratory|
|Subject Keywords:||Sun: flares; Sun: particle emission; Sun: X-rays; gamma rays|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||07 Aug 2009 18:59|
|Last Modified:||28 Feb 2013 21:39|
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