Chollet, E. E. and Giacalone, J. and Skoug, R. M. and Steinberg, J. T. and Gosling, J. T. (2009) Spatial Offsets of Interplanetary Ion and Electron Source Regions. Astrophysical Journal, 705 (2). pp. 1492-1495. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20091111-092752453
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Observations of impulsive solar energetic particles provide unique insight into the process of particle acceleration in the solar atmosphere. X-ray and γ-ray observations of precipitating particles from solar flares have shown offsets between the ion and the electron emission. We present Advanced Composition Explorer (ACE) observations of interplanetary energetic ion and suprathermal electron events with intensity variations related to connection or lack thereof to the particle source. These results indicate an offset between the acceleration regions of ions and electrons of the same order of magnitude as that observed in the γ-ray events. However, if the particle event originates at the magnetic footpoints of an interplanetary coronal mass ejection, the ACE observations do not exhibit this offset, suggesting that different magnetic geometry or acceleration processes may be present in those regions.
|Additional Information:||© 2009 The American Astronomical Society. Received 2009 July 16; accepted 2009 September 29; published 2009 October 22. Much of this work was performed at the University of Arizona, as part of the first author’s doctoral work. This work was supported, in part, by the NSF under grant ATM0447354.|
|Subject Keywords:||acceleration of particles; interplanetary medium; Sun: magnetic fields; Sun: particle emission|
|Official Citation:||Spatial Offsets of Interplanetary Ion and Electron Source Regions E. E. Chollet, J. Giacalone, R. M. Skoug, J. T. Steinberg, and J. T. Gosling 2009 ApJ 705 1492-1495 doi: 10.1088/0004-637X/705/2/1492|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||16 Nov 2009 17:26|
|Last Modified:||26 Dec 2012 11:33|
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