Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published December 11, 2010 | Published
Journal Article Open

Multipoint connectivity analysis of the May 2007 solar energetic particle events


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.

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.

Attached Files

Published - Chollet2010p12358J_Geophys_Res-Space.pdf


Files (2.3 MB)
Name Size Download all
2.3 MB Preview Download

Additional details

August 22, 2023
October 21, 2023