Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11207106b&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue A7, CiteID A07106
Physics
8
Interplanetary Physics: Heliosphere/Interstellar Medium Interactions, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836), Interplanetary Physics: Pickup Ions, Interplanetary Physics: General Or Miscellaneous
Scientific paper
Voyager 1 (V1) observed a unipolar interval in the heliosheath from day of year (DOY) 146-204, 2006, in which the magnetic field B was directed toward the Sun nearly along the spiral field direction. The direction of B was nearly constant in this interval (the 1-σ fluctuations in the hour averages and 48-s averages of the azimuthal and elevation angles being ~+/-8° and ~+/-5°, respectively). The average magnetic field strength was relatively large, B ~ 0.21 nT. The fluctuations in both the hour averages and 48-s averages of B were non-Gaussian, being skewed toward small values of B, primarily by the presence of numerous linear magnetic holes. The magnetic holes moved past V1 at a rate of the order of 2/day. The characteristics of nine magnetic holes were analyzed by fitting the magnetic field strength profiles to a Gaussian distribution. The radial extent of the magnetic holes was of the order of 650,000 km, which is ~80 RL, where RL is the Larmor radius of the pickup protons in the heliosheath. Although the magnetic holes in the heliosheath are much larger than those at 1 AU, the size in units of RL is of the same order of magnitude in the two locations, suggesting a common physical nature.
Acuña Mario Humberto
Burlaga Leonard Francis
Ness Norman F.
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