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

Daniel Vech, Daniel Vech, Justin C. Kasper, Justin C. Kasper, Kristopher G. Klein, Jia Huang, Michael L. Stevens, Christopher H.K. Chen, Anthony W. Case, Kelly Korreck, Stuart D. Bale, Trevor A. Bowen, Phyllis L. Whittlesey, Roberto Livi, Davin E. Larson, David Malaspina, Marc Pulupa, John Bonnell, Peter Harvey, Keith GoetzThierry Dudok De Wit, Robert MacDowall

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


In this work, we present the first results from the flux angle (FA) operation mode of the Faraday Cup instrument on board the Parker Solar Probe (PSP). The FA 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 when the FA mode was used in PSP's first encounter at 0.174 au distance from the Sun.

Original languageEnglish (US)
Article number52
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - Feb 2020

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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