Phase delays in transverse disturbances in the earth's magnetosheath

Physics

Scientific paper

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Earth Magnetosphere, International Sun Earth Explorers, Magnetic Disturbances, Magnetohydrodynamic Waves, Magnetosheath, Wave Propagation, Magnetic Fields, Shock Waves, Solar Wind, Wave Fronts

Scientific paper

A transverse magnetic disturbance in the afternoon sector of the earth's magnetosheath is analyzed using ISEE 1 and 2 data. It is noted that the disturbance is not unlike a linearly polarized Alfven wave with a high degree of spatial coherence in the signal at ISEE 1 and 2 which were 890 km apart. A cross-spectral technique is used to determine that points of common phase arrive at the two spacecraft with clearly discernible time difference. It is noted that the time delays at the two spacecraft are consistent with wave vectors having a substantial component across the ambient field and along the local inward shock normal. It is suggested that the direction of propagation implies transmission of wave fronts from the quasi-perpendicular bow shock toward the magnetopause and that this result may have important consequences for the control of magnetospheric processes by shock-generated magnetosheath waves and places significant restraints on the nature of the wave source.

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