Possible Kelvin-Helmholtz waves driven by reconnection accelerated flows

Physics

Scientific paper

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Geomagnetism, Kelvin-Helmholtz Instability, Magnetic Field Reconnection, Plasma Acceleration, Space Plasmas, Fine Structure, Magnetic Signatures, Magnetopause, Signal Analysis

Scientific paper

New observations of highly steepened magnetic signals within the dayside magnetopause current layer, having a period of about 5 seconds are reported. These signals are embedded within a reconnection region, and it is suggested that they may be Kelvin-Helmholtz waves driven unstable by the velocity shear associated with reconnection accelerated flows. It is due to the low magnetic field strength and consequent high Alfven Mach number that the signals are confined to the magnetopause. The data presented consist of high-time-resolution magnetic-field and plasma measurements from the AMPTE-UKS satellite.

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