Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh14a..01r&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH14A-01
Physics
2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 2152 Pickup Ions, 2164 Solar Wind Plasma
Scientific paper
Voyager 2 has explored the heliosheath for more than a year. We now have enough data to look at statistical comparisons of the heliosheath with planetary magnetosheaths and compare the heliosheath data with that in the upstream solar wind. We find that the temperature distributions in the heliosheath are much broader than those in the solar wind. If the scatter in the temperatures results from differences in heating due to shock motion, then shock speeds of -100 to 100 km/s fit the observations. Fluctuations in the heliosheath are much larger than those seen in planetary magnetospheres, implying rapid temporal changes of the shock movement or structure. A significant number of spectra in the heliosheath have very cold temperatures suggesting this plasma was relatively unaffected by the shock. We show longer scale temporal events in the sheath which may be driven by solar wind changes. One unique 5-day event showed substantially higher density, temperature, and speeds than the ambient sheath plasma and we speculate on its origin.
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