The Bastille day Shocks and Merged Interaction Region |
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| Authors: | Whang YC Burlaga LF Ness NF Smith CW |
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| Institution: | (1) Catholic University of America, Washington, DC, 20064, U.S.A.;(2) NASA Goddard Space Flight Center, Greenbelt, MD, 20771, U.S.A.;(3) Bartol Research Institute, University of Delaware, Newark, DE, 19716, U.S.A. |
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| Abstract: | Near 1 AU the solar wind structure associated with the solar flare of 14 July 2000 (Bastille Day) consisted of a large high-speed
stream of 15 July and five nearby small streams during a 10-day period. At the leading edge of the large high-speed stream,
in less than 6 hours, the flow speed increased from 600 km s−1 to 1100 km s−1, the magnetic field intensity increased from 10 nT to 60 nT, and an interaction region was identified. The interaction region
was bounded between the pair of a forward shock F and a reverse shock R. Additional forward shocks were also identified at the leading edge of each of the five smaller streams. This paper presents
a magnetohydrodynamics (MHD) simulation using ACE plasma and magnetic field data near 1 AU as input to study the radial evolution
of the Bastille Day solar wind event. The two shocks, F and R, propagated in opposite directions away from each other in the solar wind frame and interacted with neighboring shocks and
streams; the spatial and temporal extent of the interaction region continued to increase with the heliocentric distance. The
solar wind was restructured from a series of streams at 1 AU to a huge merged interaction region (MIR) extending over a period
of 12 days at 5.5 AU. Throughout the interior of the MIR bounded by the shock pair F and R the magnetic field intensity was a few times stronger than that outside the MIR. The simulation shows how merging of shocks,
collision of shocks, and formation of new shocks contributed to the evolution process. |
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