Time-dependent evolution of nonlinear MHD disturbances in the solar wind

Details Time-dependent evolution of nonlinear MHD disturbances in the solar wind Time-dependent evolution of nonlinear MHD disturbances in the solar wind

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51d1719k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH51D-1719

Physics

Plasma Physics

[2164] Interplanetary Physics / Solar Wind Plasma, [7836] Space Plasma Physics / Mhd Waves And Instabilities, [7839] Space Plasma Physics / Nonlinear Phenomena, [7851] Space Plasma Physics / Shock Waves

Scientific paper

Propagation of nonlinear MHD waves is studied in the interplanetary space. As realistic variations in the solar wind become often nonlinear, it is important to investigate time-dependent behaviors of the solar wind flucuations. We have examined how these fluctuations approximated as MHD waves are changed by steepening process and/or shock formation over a relatively long travel path. It is presented that the MHD fluctuations in the solar wind at the Lagrangian (L1) point are compared with the signals arriving at the Earth's magnetopause. The simulation results are first validated by the exact analytical solution (Lee and Kim, 2000), which showed excellent correspondence between theory and simulation. Our results suggest that the pattern of disturbances tends to significantly change during the travel path between L1 and the Earth's magnetosphere unless the amplitude is extremely low or the disturbance time-scale is very long. Our model provides the time-dependent solution at different locations in both exact theoretical and numerical ways, which can be useful in interpreting the solar wind data at the multiple locations.

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