Thermodynamic effect of the ion sound instability in the ionosphere

Details Thermodynamic effect of the ion sound instability in the ionosphere Thermodynamic effect of the ion sound instability in the ionosphere

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.5721k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A4, p. 5721-5726

Physics

Geophysics

4

Collisionless Plasmas, Ion Acoustic Waves, Magnetic Storms, Magnetohydrodynamic Stability, Plasma Heating, Plasmasphere, Ring Currents, Thermodynamic Properties, Field Aligned Currents, Geophysics, Heat Transfer, Plasma Turbulence

Scientific paper

During geomagnetic disturbances when the ring current interacts intensely with the plasmasphere, the plasma of this region undergoes a strong heating due to an ion cyclotron instability. This is followed by the transfer of heat along geomagnetic field lines from the heating region to the ionosphere. One of the results of this process is the formation of non-isothermal region (in which T(sub e) greater than 3.4 T(sub i) at ionospheric heights) caused by a rapid cooling the H(+) ions due to their resonant charge exchange with neutral hydrogen. Heat transfer from the top of the flux tube to the ionosphere is investigated using a hydrodynamic model for the ionosphere-plasmasphere coupling. Field-aligned currents, present in the topside ionosphere, are often accompanied by ion sound turbulence. The turbulence scatters electrons, increasing the total electron collision frequency through wave-particle effects. The influence of wave-particle interactions introduces an anomalous component to the total collision frequency, which modifies substantially the heat conduction coefficient of the plasma. As a result, the plasma is heated more intensely above than below this region of ion sound turbulence.

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