Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh51a..04h&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SH51A-04
Physics
2104 Cosmic Rays, 2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination, 7859 Transport Processes
Scientific paper
Comparisons between the energetic particle measurements made with the Low Energy Charged Particle instrument on Voyager 1 in the termination foreshock (TFS) and the heliosheath (HS) have revealed some key features, using the observational tools of intensity, anisotropy, and spectral measurements. The shape and temporal evolution of ion spectra in both the TFS and the HS are organized by total kinetic energy. This total energy dependence is a robust feature that should be predicted by models and theories. In the TFS the anisotropies are organized by energy per nucleon but the spectra are organized by total kinetic energy. In the HS there is a period with anisotropy and spectra organized by total energy. Possibly this is evidence for two different transport regimes. There is at least one component of the spectra (dubbed "third source" particles) from ~1-100 MeV that exhibits different time profiles, spectral shape, and anisotropy from either the TFS particles or anomalous cosmic rays. In addition to the intensities, anisotropies, and spectral variations there remains an important tool to try to probe the energetic particle phenomena near the termination shock. This tool is elemental composition. We will report on the composition of energetic ions in the different regions of the TFS observed by Voyager 1 and 2, and in the HS observed by Voyager 1. In particular we will examine the comparative composition in these regions and relate this to previously measured pickup ions and anomalous cosmic ray composition.
Decker Robert B.
Hill Matthew E.
Krimigis Stamatios M.
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