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Voyager observations of galactic and anomalous cosmic rays in the helioshealth

McDonald, F. B. and Webber, W. R. and Stone, E. C. and Cummings, A. C. and Heikkila, B. C. and Lal, N. (2006) Voyager observations of galactic and anomalous cosmic rays in the helioshealth. In: PHYSICS OF THE INNER HELIOSHEATH: Voyager Observations, Theory, and Future Prospects; 5th Annual IGPP International Astrophysics Conference. AIP Conference Proceedings. No.858. American Institute of Physics , Melville, NY, pp. 79-85. ISBN 978-0-7354-0355-0.

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Anomalous cosmic rays display large temporal variations at the time and location where Voyager 1 (V1) crossed the heliospheric termination shock (2004.86) (94AU, 34°N). On a short time scale (3 months) there was a large decrease produced by a series of merged interaction regions (MIR), the first of which was associated with the intense Oct./Nov. 2003 solar events. On a longer time scale there is a remarkable correlation between changes in the galactic cosmic ray (GCR) intensity and those of 10–56 MeV/n ACR He and 30–56 MeV H extending over a 4.3 year period with the GCRs exhibiting their expected behavior over this part of the 11 and 22 year solar activity and heliomagnetic cycle. The relative changes in the ACR and GCR are the same for both the short term and long term variations. The comparative V1/V2 ACR and GCR spectra in the foreshock and heliosheath indicate that at this time most of the higher energy ACRs are not being accelerated near V1 but must have their source region elsewhere — possibly near the equatorial region of the TS as was suggested in our first paper on the TS crossing (1).

Item Type:Book Section
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Stone, E. C.0000-0002-2010-5462
Cummings, A. C.0000-0002-3840-7696
Additional Information:© 2006 American Institute of Physics.
Group:Space Radiation Laboratory
Subject Keywords:Galactic Cosmic Rays, Anomalous Cosmic Rays, Termination Shock, Heliosheath, Voyager
Series Name:AIP Conference Proceedings
Issue or Number:858
Classification Code:PACS: 96.50.S-, 96.50.Ek, 98.70.Sa
Record Number:CaltechAUTHORS:MCDaipcp06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6298
Deposited By: Archive Administrator
Deposited On:01 Dec 2006
Last Modified:20 Feb 2020 14:33

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