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

Abstract

Context. 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. Aims. We present a novel approach to study wave-particle energy exchange with PSP. Methods. 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. Results. Our results suggest that the energy transfer from fields to particles on the timescale of a cyclotron period is equal to approximately 3-6% of the electromagnetic energy flux. This rate is consistent with the hypothesis that the ion cyclotron wave was locally generated in the solar wind.

arXiv commentAccepted in Astronomy and Astrophysics

References in corpus (19)

• Double-slit photoelectron interference in strong-field ionization of the neon dimer
• Magnetic fluctuation power near proton temperature anisotropy instability thresholds in the solar wind
• The multi-scale nature of the solar wind
• The Solar Probe Cup on Parker Solar Probe
• Ion Scale Electromagnetic Waves in the Inner Heliosphere
• Parker Solar Probe observations of proton beams simultaneous with ion-scale waves
• Proton Temperature Anisotropy Variations in Inner Heliosphere Estimated with First Parker Solar Probe Observations
• Predicted Impacts of Proton Temperature Anisotropy on Solar Wind Turbulence
• Diagnosing collisionless energy transfer using field-particle correlations: gyrokinetic turbulence
• Instabilities Driven by the Drift and Temperature Anisotropy of Alpha Particles in the Solar Wind
• A Majority of Solar Wind Intervals Support Ion-Driven Instabilities
• Limits on Alpha Particle Temperature Anisotropy and Differential Flow from Kinetic Instabilities: Solar Wind Observations
• A Parallel-Propagating Alfvénic Ion-Beam Instability in the High-Beta Solar Wind
• Frame Dependence of the Electric Field Spectrum of Solar Wind Turbulence
• Parallel-propagating Fluctuations at Proton-kinetic Scales in the Solar Wind are Dominated by Kinetic Instabilities
• Diagnosing collisionless energy transfer using field-particle correlations: Alfven-Ion Cyclotron Turbulence
• The Radial Dependence of Proton-scale Magnetic Spectral Break in Slow Solar Wind during PSP Encounter 2
• The Electromagnetic Signature of Outward Propagating Ion-Scale Waves
• Kinetic Scale Spectral Features of Cross Helicity and Residual Energy in the Inner Heliosphere

Cited by in corpus (7)

• Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum
• The In Situ Signature of Cyclotron Resonant Heating
• The Radial Distribution of Ion-scale Waves in the Inner Heliosphere
• Modeling ion beams, kinetic instabilities, and waves observed by the Parker Solar Probe near perihelia
• Ion-Driven Instabilities in the Inner Heliosphere II: Classification and Multi-Dimensional Mapping
• Modeling hot, anisotropic ion beams in the solar wind motivated by the Parker Solar Probe observations near perihelia
• Growth of Outward Propagating Fast-Magnetosonic/Whistler Waves in the Inner Heliosphere Observed by Parker Solar Probe