Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3519107l&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 19, CiteID L19107
Physics
6
Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Discontinuities (7811)
Scientific paper
In August 2007, Voyager 2 reached the termination shock and entered the heliosheath at a distance of about 83.6 AU. Due to the variations of the solar wind dynamic pressure or waves on the shock front, the termination shock moved back and forth, and Voyager 2 crossed the termination shock multiple times. We use the best fit solution of the Monte-Carlo method to define the upstream and downstream conditions and determine the properties of termination shock, such as the shock normal, speed, and strength. For the crossings on DOY 243.819-243.875(shock 1) and DOY 243.99-244.012(shock 2), the termination shock moved almost in the radial direction. The shock is nearly perpendicular, and the angle between the shock normal and the solar wind magnetic field is about 70°. In the case of the first crossing, the termination shock moved away from the Sun with a speed of about 100 km s-1, whereas the termination shock moved toward Sun with a speed of about 30 km s-1 for the second crossing. The density ratios of the termination shock are 2.2 and 1.6, respectively. For both crossing events, the flow is found to be still supersonic with respect to the thermal ions downstream of the termination shock, probably due to the fact that most of the solar wind energy is transferred to the pickup ions.
Li Handong
Richardson John D.
Wang Chenjie
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