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Solar Wind Electric Fields in the Ion Cyclotron Frequency Range

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arxiv physics/0602179 v1 pith:75ZN77YV submitted 2006-02-26 physics.space-ph

Solar Wind Electric Fields in the Ion Cyclotron Frequency Range

classification physics.space-ph
keywords electricfieldsfluctuationsfrequencymagneticsolarwindcyclotron
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Measurements of fluctuations of electric fields in the frequency range from a fraction of one Hz to 12.5 Hz are presented, and corrected for the Lorentz transformation of magnetic fluctuations to give the electric fields in the plasma frame. The electric fields are large enough to provide the dominant force on the ions of the solar wind in the region near the ion cyclotron frequency of protons, larger than the force due to magnetic fluctuations. They provide sufficient velocity space diffusion or heating to counteract conservation of magnetic moment in the expanding solar wind to maintain nearly isotropic velocity distributions.

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