Fast plasma flows in the translunar magnetotail

Physics

Scientific paper

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Cislunar Space, Geomagnetic Tail, Magnetohydrodynamic Flow, Plasma Interactions, Space Plasmas, Bursts, Fine Structure, Flow Velocity, Geomagnetism, Ion Density (Concentration), Ion Temperature, Lunar Orbits, Magnetic Fields

Scientific paper

Unusual, high-speed, antisunward bursts of plasma have been discovered to occur persistently in the translunar magnetotail. Faster, cooler, and less dense than the plasma flows usually found in the translunar magnetotail, these bursts suggest that small-scale magnetic merging occurs regularly in the plasma sheet. Calculations which assume that the measured particle energy spectra are flowing hydrogen Maxwellians indicate that the bursts have bulk speeds of 250 to 700 km/sec ion temperatures of 20 to 100 eV, and ion densities of 0.001 to 0.01/cu cm. Most bursts occur within one hour of changes in the tail magnetic field that suggest the passage of the moon near magnetic bubbles. Bursts do not seem to be fundamentally caused by strong solar or geomagnetic activity. Rather, the bursts seem to result from the transfer of magnetic field energy to mantle plasma in the translunar magnetotail.

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