Voyager 2 observations related to the October-November 2003 solar events

Creators: Burlaga, L. F.; Ness, N. F.; Stone, E. C.; McDonald, F. B.; Richardson, J. D.

Abstract

A transient flow system observed at 1 AU from October 24–November 7, 2003 (consisting of several shocks, ejecta and possibly other flows) moved away from the Sun for ≈180 days to 73 AU, where Voyager 2 (V2) observed a large Merged Interaction Region (MIR) associated with a fast (560 km/s) stream that followed a forward shock and moved past V2 for ≈1.5 solar rotations. The MIR and stream were associated with a large decrease in the cosmic ray intensity and an exceptionally large enhancement in the flux of ≈2.5 MeV protons. The speed and the cosmic ray profiles observed by V2 were very simple, resembling the profiles of a shock/sheath/ejecta flow and a Forbush decrease, respectively, at 1 AU, but rescaled by a factor by a factor of ≈10. The onset of the MIR-associated decrease in the cosmic ray intensity occurred 10 days after the shock, lasting several days, with a full recovery ≈70 days after the onset.

Additional Information

© 2005 by the American Geophysical Union. Received 13 September 2004; revised 29 October 2004; accepted 4 November 2004; published 12 January 2005. N. F. Ness was partially supported by JPL Contract #959167. J. D. Richardson was partially supported by NASA under JPL contract 959203 from JPL to MIT and NASA Grant NAG5-11623. We thank S. Kramer and T. McClanahan for support in processing the magnetic field data, and M. Acuña for his continued assistance in evaluating the measurements. F. McDonald was supported by NASA Grant # 910819-8143.

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