Cosmic ray modulatin and merged interaction regions

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1985ICRC____4__396B.pdf (429.96 KB)

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https://ui.adsabs.harvard.edu/abs/1985ICRC....4..396B/abstract

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http://hdl.handle.net/11603/30529

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UMBC Goddard Planetary Heliophysics Institute (GPHI)

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https://orcid.org/0000-0002-5317-988X

Date

1985-08

Type of Work

conference papers and proceedings
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Citation of Original Publication

Burlaga, L. F., M. L. Goldstein, and F. B. McDonald. “Cosmic Ray Modulatin and Merged Interaction Regions” 19th Intern. Cosmic Ray Conf. 4 (August 1, 1985): 396–99. https://ui.adsabs.harvard.edu/abs/1985ICRC....4..396B/abstract.

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This is a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

Beyond several AU, interactions among shocks and streams give rise to merged interaction regions in which the magnetic field is turbulent. The integral intensity of . 75 MeV/Nuc cosmic rays at Voyager is generally observed to decrease when a merged interaction region moves past the spacecraft and to increase during the passage of a rarefaction region. When the separation between interaction regions is relatively large, the cosmic ray intensity tends to increase on a scale of a few months. This was the case at Voyager 1 from July 1, 1983 to May 1, 1984, when the spacecraft moved from 16.7 to 19.6 AU. Changes in cosmic ray intensity were related to the magnetic field strength in a simple way. It is estimated that the diffusion coefficient in merged interaction regions at this distance is similar to 0.6 x 10 to the 22nd power sq cm/s.