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Wave-particle energy transfer directly observed in an ion cyclotron wave

Abstract : The first studies with Parker Solar Probe (PSP) data have made significant progress toward the understanding of the fundamental properties of ion cyclotron waves in the inner heliosphere. The survey mode particle measurements of PSP, however, did not make it possible to measure the coupling between electromagnetic fields and particles on the time scale of the wave periods. In this work, we present a novel approach to study wave-particle energy exchange with PSP. We use the Flux Angle operation mode of the Solar Probe Cup in conjunction with the electric field measurements and present a case study when the Flux Angle mode measured the direct interaction of the proton velocity distribution with an ion cyclotron wave. We show that there is a remarkably good correlation between the high frequency (>0.6 Hz) fluctuations of the kinetic energy flux and Poynting flux and develop a technique to quantify the net energy flux transfer from fields to particles.
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https://hal-insu.archives-ouvertes.fr/insu-03560084
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Submitted on : Monday, February 7, 2022 - 1:04:40 PM
Last modification on : Tuesday, May 10, 2022 - 3:24:57 PM

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D. Vech, M. Martinović, K. G. Klein, D. Malaspina, J. C. Kasper, et al.. Wave-particle energy transfer directly observed in an ion cyclotron wave. American Geophysical Union, 2020, Online, France. 18 pp. ⟨insu-03560084⟩

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