Association of fire-hose instability and geomagnetic activity in the plasma sheet.

Physics

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Earth Magnetosphere: Plasma

Scientific paper

During maximum solar activity years (1978 - 79) and at low geomagnetic activity, the temperature of the plasma sheet (PS) in the tail region of Earth's magnetosphere is found to be decreasing. The heating of the PS ions can occur both adiabatically and non-adiabatically. The strong ion heating associated with substorm-onset occurs in a non-adiabatic fashion with a strong increase of specific entropy, and this heating is found to be localized since both low and high entropy plasmas are present in the PS. During high activity periods, the PS was found to be surviving against particle loss and heat transport. The chaotic behaviour of the PS during the selected substorm events is also discussed.

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