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A Transition to Fast Flows and Its Effects on the Magnetic Fields and Cosmic Rays Observed by Voyager 2 near 70 AU

Burlaga, L. F. and Ness, N. F. and Wang, C. and Richardson, J. D. and McDonald, F. B. and Stone, E. C. (2005) A Transition to Fast Flows and Its Effects on the Magnetic Fields and Cosmic Rays Observed by Voyager 2 near 70 AU. Astrophysical Journal, 618 (2). pp. 1074-1078. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20140827-092747905

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Abstract

A shocklike transition at 2003.37 from quasi-periodic flows to increasingly fast flows was observed by Voyager 2 (V2) near 70 AU. The transition was related to the appearance of coronal holes near the solar equatorial plane on Carrington rotation (CR) ≈1994. Several important features (two cycles of quasi-periodic variations in V and B, a shock, a merged interaction region (MIR) with strong magnetic fields in a region with increasing speed, and a second shock that was related to the 2003 October 29-30 events at 1 AU) were observed by V2 from 2002.8 to 2004.4. A one-dimensional multifluid MHD model shows that these features at V2 evolved from the flows observed by ACE at 1 AU. The model also shows that the features propagated through the heliosphere out to 95 AU. The changes in the magnetic field associated with the features at V2 caused changes in the cosmic-ray intensity (CRI) of particles more energetic than 70 MeV nucleon^(-1). The quasi-periodic variations were related to variations in CRI, but they produced no appreciable net decrease in the CRI. Both the first shock and the MIR produced a steplike decrease in the CRI at V2.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://iopscience.iop.org/0004-637X/618/2/1074PublisherArticle
http://dx.doi.org/10.1086/426105DOIArticle
Additional Information:© 2005 American Astronomical Society. Received 2004 May 31; accepted 2004 September 21. N. F. Ness was partially supported by JPL Contract 959167. J. D. Richardson and C. Wang were partially supported by NASA under JPL contract 959203 to MIT and NASA grant NAG5-11623. C. Wang was also supported in part by NNSFC 40204009 from China. We thank S. Kramer and T. McClanahan for support in processing the magnetic field data, and M. Acunã for his continued assistance in evaluating the measurements. The ACE plasma and magnetic field data used in this work were obtained from the ACE Science Center. The ACE magnetic field data were provided by C. Smith and N. Ness. The ACE plasma data were provided by R. Skoug and D. McComas.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
JPL959167
NASA959203
NASANAG5-11623
Natural National Science Foundation of China (NNSFC)40204009
Subject Keywords: cosmic rays; interplanetary medium
Record Number:CaltechAUTHORS:20140827-092747905
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140827-092747905
Official Citation:A Transition to Fast Flows and Its Effects on the Magnetic Fields and Cosmic Rays Observed by Voyager 2 near 70 AU L. F. Burlaga et al. 2005 ApJ 618 1074
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48971
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:27 Aug 2014 17:34
Last Modified:28 Aug 2014 20:22

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