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Transverse eV ion heating by random electric field fluctuations in the plasmasphere

Abstract : Charged particle acceleration in the Earth inner magnetosphere is believed to be mainly due to thelocal resonant wave-particle interaction or particle transport processes. However, the Van AllenProbes have recently provided interesting evidence of a relatively slow transverse heating of eVions at distances about 2–3 Earth radii during quiet times. Waves that are able to resonantly interactwith such very cold ions are generally rare in this region of space, called the plasmasphere. Thus,non-resonant wave-particle interactions are expected to play an important role in the observed ionheating. We demonstrate that stochastic heating by random transverse electric field fluctuations ofwhistler (and possibly electromagnetic ion cyclotron) waves could explain this weak and slowtransverse heating ofHþandOþions in the inner magnetosphere. The essential element of the pro-posed model of ion heating is the presence of trains of random whistler (hiss) wave packets, withsignificant amplitude modulations produced by strong wave damping, rapid wave growth, or asuperposition of wave packets of different frequencies, phases, and amplitudes. Such characteristicscorrespond to measured characteristics of hiss waves in this region. Using test particle simulationswith typical wave and plasma parameters, we demonstrate that the corresponding stochastic trans-verse ion heating reaches 0.07–0.2 eV/h for protons and 0.007–0.015 eV/h forOþions. This globaltemperature increase of the Maxwellian ion population from an initialTi0:3 eV could potentiallyexplain the observations
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Submitted on : Thursday, September 3, 2020 - 10:58:35 AM
Last modification on : Wednesday, September 23, 2020 - 4:38:18 AM

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A.V. Artemyev, Didier Mourenas, O.V. Agapitov, L. Blum. Transverse eV ion heating by random electric field fluctuations in the plasmasphere. Physics of Plasmas, American Institute of Physics, 2017, 24 (2), pp.022903. ⟨10.1063/1.4976713⟩. ⟨insu-02928088⟩

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