Kinetic Scale Spectral Features of Cross Helicity and Residual Energy in the Inner Heliosphere

Abstract

In this Paper, we present the first results from the Flux Angle operation mode of the Faraday Cup instrument onboard Parker Solar Probe. The Flux Angle mode allows rapid measurements of phase space density fluctuations close to the peak of the proton velocity distribution function with a cadence of 293 Hz. This approach provides an invaluable tool for understanding kinetic scale turbulence in the solar wind and solar corona. We describe a technique to convert the phase space density fluctuations into vector velocity components and compute several turbulence parameters such as spectral index, residual energy and cross helicity during two intervals the Flux Angle mode was used in Parker Solar Probe's first encounter at 0.174 AU distance from the Sun.

arXiv commentAccepted for publication in ApJS

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Cited by in corpus (8)

• The Evolution and Role of Solar Wind Turbulence in the Inner Heliosphere
• Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum
• Inner-Heliosphere Signatures of Ion-Scale Dissipation and Nonlinear Interaction
• The Enhancement of Proton Stochastic Heating in the near-Sun Solar Wind
• Wave-particle energy transfer directly observed in an ion cyclotron wave
• Taylor microscale and effective Reynolds number near the Sun from PSP
• Four-dimensional equations for the study of electromagnetic plasma turbulence in a drift kinetic limit
• Turbulence properties and kinetic signatures of electron in Kelvin-Helmholtz waves during a geomagnetic storm