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Passage of a large interplanetary shock from the inner heliosphere to the heliospheric termination shock and beyond: Its effects on cosmic rays at Voyagers 1 and 2

Webber, W. R. and Cummings, A. C. and McDonald, F. B. and Stone, E. C. and Heikkila, B. and Lal, N. (2007) Passage of a large interplanetary shock from the inner heliosphere to the heliospheric termination shock and beyond: Its effects on cosmic rays at Voyagers 1 and 2. Geophysical Research Letters, 34 (20). Art. No. L20107. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20140908-091625580

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Abstract

Using data from the charged particle telescopes on V1 and V2 we have followed the progress of a large interplanetary shock as it passes V2 at a distance of 79 AU at about 2006.16, then later crosses the heliospheric termination shock finally reaching V1 at a distance ∼100 AU. A decrease ∼15% is observed in the V2 >70 MeV rate starting at 2006.19 and three smaller decreases starting at 2006.29, 2006.50 and 2006.86 are observed at V1. From the timing of the first two decreases at V1 we are able to determine that the average shock speed slows down at the termination shock from ∼600 km s^(−1) to 210–270 km s^(−1). Decreases of ∼30–50% in anomalous He and galactic H are observed at V2 when the shock passes this location inside the termination shock. Smaller decreases are observed for both of these components when the weakened interplanetary shock passes V1 at 2006.50. These results define the extent and magnitude of solar modulation effects on cosmic rays caused by transients both inside and beyond the termination shock.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://onlinelibrary.wiley.com/doi/10.1029/2007GL031339/abstractPublisherArticle
http://dx.doi.org/10.1029/2007GL031339DOIArticle
ORCID:
AuthorORCID
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2007 by the American Geophysical Union. Received 16 July 2007; revised 21 August 2007; accepted 19 September 2007; published 25 October 2007.
Issue or Number:20
Record Number:CaltechAUTHORS:20140908-091625580
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140908-091625580
Official Citation:Webber, W. R., A. C. Cummings, F. B. McDonald, E. C. Stone, B. Heikkila, and N. Lal (2007), Passage of a large interplanetary shock from the inner heliosphere to the heliospheric termination shock and beyond: Its effects on cosmic rays at Voyagers 1 and 2, Geophys. Res. Lett., 34, L20107, doi:10.1029/2007GL031339.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49317
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:08 Sep 2014 17:35
Last Modified:20 Feb 2020 14:33

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