Formation of the Bastille Day Merged Interaction Region

Details Formation of the Bastille Day Merged Interaction Region Formation of the Bastille Day Merged Interaction Region

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh21b..06w&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH21B-06

Other

2109 Discontinuities, 2134 Interplanetary Magnetic Fields, 2139 Interplanetary Shocks, 2164 Solar Wind Plasma

Scientific paper

We present a simulation study for the radial evolution of the large solar wind stream associated with the flare of July 14, 2000 (Bastille day). An interaction region bounded between a forward-reverse shock pair first formed near 1 AU at the leading edge of the large stream; the interaction region continued to interact with the solar wind structures and other shocks identified at the leading edges of nearby streams to form a merged interaction region (MIR). The model treats shocks as surfaces of zero thickness, and the Rankine-Hugoniot relations are used to calculate the jump conditions at all shocks. The simulation shows how merging of shocks, collision of shocks, and formation of new shocks contributed to the evolution process. The solar wind was restructured from a series of large and small streams at 1 AU to a huge MIR outside 5 AU. The magnetic field structure outside 5 AU bore no resemblance to the parent structure at 1 AU; the magnetic field had relatively small variation throughout the interior of the MIR, and the field intensity was a few times stronger than that outside the MIR. This MIR can act as a barrier to the propagation of galactic cosmic rays. Possible Voyager 2 observation of this MIR at 63 AU in January 2001 has been reported by Burlaga et al. [2001] and by Wang et al. [2001].

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