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

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

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh42a..07b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH42A-07

Physics

2104 Cosmic Rays, 2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma

Scientific paper

A transition from quasi-periodic flows to increasingly fast flows was observed by Voyager 2 (V2) near 70 AU from 2002.8 to 2004.4. The transition was related to the appearance of coronal holes near the solar equatorial plane on Carrington Rotation (CR)1994. Voyager 2 observed several important features (two cycles of quasi-periodic variations in V and B, a shock at 2003.37, a Merged Interaction Region (MIR) with strong magnetic fields in a region with increasing speed, and a shock at 2004.33. A 1-D multi-fluid MHD model (Wang, C., and J. Richardson, J. Geophys. Res., 106(A12) 29,401-29,408, 2001) shows that these features at V2 evolved from the flows observed by ACE at 1 AU. The changes in the cosmic ray intensity (CRI) greater than 70 MeV/n were related to the magnetic field strength at V2. The quasi-periodic variations were related to variations in CRI, but they produced no appreciable net decrease in the CRI. The first shock and the MIR produced a step-like decrease in the CRI at V2 during 2003. The shock observed by V2 at 2004.33 was followed by a MIR and a fast stream. These events were related to a system of transient flows associated with the October - November 2003 events at 1 AU, and they caused a large decrease in the cosmic ray intensity and a large enhancement of 2.5 MeV protons observed by V2.

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