TY - JOUR
T1 - Compressional MHD wave transport in the magnetosphere 1. Reflection and transmission across the plasmapause
AU - Lee, Dong Hun
AU - Hudson, Mary K.
AU - Kim, Kihong
AU - Lysak, Robert L.
AU - Song, Yan
PY - 2002/10
Y1 - 2002/10
N2 - Magnetohydrodynamic (MHD) wave properties in inhomogeneous plasmas such as the magnetosphere are complicated by existence of local cutoff, coupling, and dissipation. We study the transport of MHD waves when compressional waves are assumed to propagate into the plasmasphere from the outer magnetosphere. By assuming a region of the Alfven speed crest, which approximates the plasmapause region, we investigate how the initial compressional MHD wave energy is reflected, absorbed, and delivered across the plasmapause. Our results present the exact reflection, transmission, and absorption coefficients without any theoretical approximations for given frequencies and wave numbers. It is found that relatively strong absorption of compressional waves occurs where the frequency ranges from the local resonant condition to the cutoff condition at the maximum of the Alfven speed crest. We compare and discuss the behavior of compressional waves in our results with previous observations.
AB - Magnetohydrodynamic (MHD) wave properties in inhomogeneous plasmas such as the magnetosphere are complicated by existence of local cutoff, coupling, and dissipation. We study the transport of MHD waves when compressional waves are assumed to propagate into the plasmasphere from the outer magnetosphere. By assuming a region of the Alfven speed crest, which approximates the plasmapause region, we investigate how the initial compressional MHD wave energy is reflected, absorbed, and delivered across the plasmapause. Our results present the exact reflection, transmission, and absorption coefficients without any theoretical approximations for given frequencies and wave numbers. It is found that relatively strong absorption of compressional waves occurs where the frequency ranges from the local resonant condition to the cutoff condition at the maximum of the Alfven speed crest. We compare and discuss the behavior of compressional waves in our results with previous observations.
KW - 2768 magnetospheric physics: plasmasphere
KW - 2772 magnetospheric physics: plasma waves and instabilities
KW - 7827 space plasma physics: kinetic and MHD theory
KW - 7871 space plasma physics: waves and instabilities
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U2 - 10.1029/2002JA009239
DO - 10.1029/2002JA009239
M3 - Article
AN - SCOPUS:12444333448
SN - 2169-9380
VL - 107
JO - Journal of Geophysical Research: Space Physics
JF - Journal of Geophysical Research: Space Physics
IS - A10
M1 - 1307
ER -