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Relation between the solar wind dynamic pressure at Voyager 2 and the energetic particle events at Voyager 1

Richardson, J. D. and McDonald, F. B. and Stone, E. C. and Wang, C. and Ashmall, J. (2005) Relation between the solar wind dynamic pressure at Voyager 2 and the energetic particle events at Voyager 1. Journal of Geophysical Research A, 110 (A9). Art. No. A09106. ISSN 0148-0227. doi:10.1029/2005JA011156.

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Starting in 2001, Voyager 1 observed three events characterized by enhanced fluxes of energetic particles. These events suggest that Voyager 1 made a close approach to, or a crossing of, the termination shock. Although the plasma experiment on Voyager 1 is not providing useful data, plasma data from Voyager 2 may shed light on the plasma conditions at Voyager 1. Before the first particle event, Voyagers 1 and 2 see similar particle signatures. Voyager 2 pressure and energetic particle flux profiles have similar structure. The merged interaction regions (MIRs) observed at Voyager 2 have counterparts in the Voyager 1 data. We propagate solar wind data from Voyager 2 to Voyager 1 and show that at the predicted MIR arrival times, there is always a response in the Voyager 1 particle data. These effects vary, from an increase in particle flux to a rapid turnoff of the particle event. We discuss the observed energetic particle effects and how the MIRs produce them.

Item Type:Article
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URLURL TypeDescription DOIArticle
Richardson, J. D.0000-0003-4041-7540
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2005 by the American Geophysical Union. Received 29 March 2005; revised 11 May 2005; accepted 14 June 2005; published 29 September 2005. We thank N. Ness and L. Burlaga for use of the Voyager magnetic field data and for helpful discussion. We acknowledge the use of Ulysses SWOOPS data from the NSSDC (D. McComas, principal investigator). The work at MIT was supported under NASA contract 959203 from JPL to MIT and NASA grant NAG5-11623. C. Wang was supported in part by NNSFC 40204009 and 40325010 from China. This work was also supported in part by an international collaboration team grant from the Chinese Academy of Sciences. Shadia Rifai Habbal thanks Zdenek Nemecek and another referee for their assistance in evaluating this paper.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Natural National Science Foundation of China (NNSFC)40204009
Natural National Science Foundation of China (NNSFC)40325010
Chinese Academy of SciencesUNSPECIFIED
Subject Keywords:termination shock; MIRs; solar wind
Issue or Number:A9
Record Number:CaltechAUTHORS:20140319-093212969
Persistent URL:
Official Citation:Richardson, J. D., F. B. McDonald, E. C. Stone, C. Wang, and J. Ashmall (2005), Relation between the solar wind dynamic pressure at Voyager 2 and the energetic particle events at Voyager 1, J. Geophys. Res., 110, A09106, doi:10.1029/2005JA011156
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44388
Deposited By: Tony Diaz
Deposited On:19 Mar 2014 20:47
Last Modified:10 Nov 2021 16:51

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