Amplification and Propagation of Geomagnetic Pulsations Pc1 in the Plasmapause Region
An electromagnetic ion cyclotron instability caused by proton temperature anisotropy of ring current particles during the recovery phase of geomagnetic storms is investigated. It is confirmed that the unstable frequency bands occur mainly below the helium ion gyrofrequency. There is an optimum value of the cold helium ion density to hot proton density for the maximum growth rate. The total wave amplification values are calculated along a single propagation path through the unstable equatorial region. It is shown that the maximum amplification value occurs just inside the plasmapause region.
KeywordsGeomagnetic Storm Maximum Growth Rate Geomagnetic Pulsation Maximum Amplification Wave Amplification
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