Evolution of fast and slow shock interactions in the inner heliosphere |
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| Authors: | C -C Wu S T Wu M Dryer |
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| Institution: | (1) The Blackett Laboratory, Imperial College, London, United Kingdom;(2) Extraterrestrische Physik, Universität Kiel, Kiel, Germany;(3) Center for Space Physics, Boston University, Boston, Massachussetts, USA;(4) Dept. of Physics and IPST, University of Maryland, College Park, Maryland, USA;(5) Dept. of Atmosph., Oceanic, and Space Sciences, University of Michigan, Ann Arbor, Mich., USA;(6) Mullard Radio Astronomy Observatory, Cavendish Laboratory, Cambridge, United Kingdom;(7) Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, Germany;(8) International Space Science Institute, Bern, Switzerland;(9) Max-Planck-Institut für Extraterrestrische Physik, Garching, Germany;(10) Science Applications International Corporation, San Diego, California, USA;(11) Astrophysikalisches Institut, Potsdam, Germany;(12) NASA/Goddard Space Flight Center, Greenbelt, Maryland, USA;(13) E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC, USA;(14) Physikalisches Institut der Universität Bern, Bern, Switzerland |
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| Abstract: | We use a one-dimensional, time-dependent adaptive grid MHD code to study the interaction between fast and slow shocks in the solar wind. Our results show that: (1) a forward slow shock (FSS) can be destroyed by a forward fast shock (FFS) that overtakes it from behind; (2) two propagating FSSs can merge into a stronger FSS; (3) a strong FSS can survive by following a strong forward fast shock; and (4) the strength of a FSS is decreased by following an FFS. These simulation results reproduce an important feature of the Helios observations (Richter, 1987) where transient fast shocks were more frequently followed within a few hours by slow shock ype discontinuities rather than by fast reverse shocks. |
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