Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh31b..04h&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH31B-04
Physics
2104 Cosmic Rays, 2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination
Scientific paper
Voyager 1 (V1) traveled from the termination foreshock (TFS) into the heliosheath (HS) by crossing the termination shock (TS) on 16 December 2004. Likewise, Voyager 2 (V2) made this transition on 1 September 2007. Now with two encounters at very different regions of the TS, we will compare the anisotropy and composition of 30 keV- -1 MeV and 1--50 MeV/nuc particles, seeking the common and peculiar features of the TFS and HS regions at the two Voyager locations, ~100AU apart. The Voyager 1 spectra in both the TFS and HS are organized by total energy. The anisotropy in the TFS is however velocity dependent and directed along -T (in spacecraft RTN- coordinates) while, by contrast, during a rare period of non-negligible anisotropy in the HS from 6--26 March 2005, the anisotropy was organized by total energy, peaked at ~20 MeV, and directed in the +T direction. This may indicate that the TFS is nearly scatter free while the HS is a high-scattering region at V1. At V2 from January to August 2007, before the TS crossing, it appears that below ~0.5-MeV the anisotropies are predominantly in the +T direction and above they are in the -T direction. We are so far unable to distinguish between total energy and velocity dependence in the V2 data, but the reversal of the anisotropy at a particular energy may be related to the reflection of upstream and transmission of downstream particles. We will continue our analysis of the V2 data and report on the comparison between the anisotropies and composition at the positions of V1 and V2.
Decker Robert B.
Hamilton Douglas C.
Hill Matthew E.
Krimigis Stamatios M.
Roelof Edmond C.
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