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Multipoint connectivity analysis of the May 2007 solar energetic particle events

Chollet, E. E. and Mewaldt, R. A. and Cummings, A. C. and Gosling, J. T. and Haggerty, D. K. and Hu, Q. and Larson, D. and Lavraud, B. and Leske, R. A. and Opitz, A. and Roelof, E. C. and Russell, C. T. and Sauvaud, J.‐A. (2010) Multipoint connectivity analysis of the May 2007 solar energetic particle events. Journal of Geophysical Research A, 115 . Art. No. A12106. ISSN 0148-0227. doi:10.1029/2010JA015552.

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In May of 2007, the STEREO Ahead and Behind spacecraft, along with the ACE spacecraft situated between the two STEREO spacecraft, observed two small solar energetic particle (SEP) events. STEREO-A and -B observed nearly identical time profiles in the 19 May event, but in the 23 May event, the protons arrived significantly earlier at STEREO-A than at STEREO-B and the time-intensity profiles were markedly different. We present SEP anisotropy, suprathermal electron pitch angle and solar wind data to demonstrate distortion in the magnetic field topology produced by the passage of multiple interplanetary coronal mass ejections on 22 and 23 May, causing the two spacecraft to magnetically connect to different points back at the Sun. This pair of events illustrates the power of multipoint observations in detailed interpretation of complex events, since only a small shift in observer location results in different magnetic field line connections and different SEP time-intensity profiles.

Item Type:Article
Related URLs:
Mewaldt, R. A.0000-0003-2178-9111
Cummings, A. C.0000-0002-3840-7696
Haggerty, D. K.0000-0001-6395-8943
Leske, R. A.0000-0002-0156-2414
Roelof, E. C.0000-0002-2270-0652
Russell, C. T.0000-0003-1639-8298
Additional Information:© 2010 American Geophysical Union. Received 12 April 2010; revised 14 September 2010; accepted 30 September 2010; published 11 December 2010. This work was supported by NASA under grants NAS5‐03131, NNX08AI11G, NNX07AN45G and by UC Berkeley under contract SA4889‐26309. We thank the STEREO/PLASTIC and ACE/SWICS teams for the use of their data. Philippa Browning thanks Tycho von Rosenvinge and another reviewer for their assistance in evaluating this paper.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
UC BerkeleySA4889-26309
Subject Keywords:Solar Physics, Astrophysics, and Astronomy: Energetic particles; Solar Physics, Astrophysics, and Astronomy: Coronal mass ejections; Space Weather: Space radiation environment; Space Plasma Physics: Charged particle motion and acceleration
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2011-05
Record Number:CaltechAUTHORS:20110118-090120711
Persistent URL:
Official Citation:Chollet, E. E., et al. (2010), Multipoint connectivity analysis of the May 2007 solar energetic particle events, J. Geophys. Res., 115, A12106, doi:10.1029/2010JA015552
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21773
Deposited By: Tony Diaz
Deposited On:31 Jan 2011 23:41
Last Modified:09 Nov 2021 16:00

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