Evolution of fast and slow shock interactions in the inner heliosphere |
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| Authors: | C -C Wu S T Wu and M Dryer |
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| Institution: | (1) CSPAR/The University of Alabama in Huntsville, 35899 Huntsville, AL, U.S.A.;(2) NOAA Space Environment Center, R/E/SE, 325 Broadway, 80303 Boulder, CO, U.S.A.;(3) CSPAR/The University of Alabama in Huntsville, 35899 Huntsville, AL, U.S.A. |
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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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