Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh23d..01b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH23D-01
Physics
[2109] Interplanetary Physics / Discontinuities, [2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [2134] Interplanetary Physics / Interplanetary Magnetic Fields, [2159] Interplanetary Physics / Plasma Waves And Turbulence
Scientific paper
This paper describes observations of the magnetic field strength B and the magnetic polarity measured by Voyager (V1) in the heliosheath, including the most recent results obtained during 2009 between 108.5 and 112.1 AU and their relationship to earlier results. A large negative magnetic polarity sector was observed during 2009 DOY 43 - 183. A positive polarity sector of comparable size was observed during 2009 DOY 255 - 364. We offer the hypothesis that the observation of the two sectors is the result of a displacement of the wavy heliospheric current sheet (HCS) to the position of V1, produced by the northward component of flow in the heliosheath. The large size of the sectors is caused by the slow radial motion of the flow observed by V1 in the heliosheath. Multiple crossings of the HCS occurred in data gaps between the 2 sectors. Two crossings of the HCS were observed directly. They were thin, and a minimum variance analysis suggests that the component to B normal to the HCS was consistent with zero. The distribution of B during 2009 was lognormal, in contrast to the Gaussian distributions observed by V1 in the heliosheath prior to 2009. The large-scale fluctuations of B, described by the distribution of increments of daily averages of B have a Tsallis distribution with q =1.6. The large-scale fluctuations of B observed by V1 during 2009 have a multifractal spectrum with the same parameters that V1 observed during 2005 close to the termination shock at 94 AU. These results suggest that the large-scale magnetic fluctuations of B are in a metastable equilibrium state in the heliosheath between 94 AU and 112 AU.
Burlaga Leonard Francis
Ness Norman F.
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