Kinetic-scale Spectral Features of Cross Helicity and Residual Energy in the Inner Heliosphere - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Supplement Year : 2020

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

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Phyllis L Whittlesey
  • Function : Author
  • PersonId : 1068579
Roberto Livi
David Malaspina
Marc Pulupa
John Bonnell
Peter Harvey
Keith Goetz
Robert Macdowall

Abstract

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.
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Dates and versions

insu-02942545 , version 1 (18-09-2020)

Licence

Attribution - NoDerivatives - CC BY 4.0

Identifiers

Cite

Daniel Vech, Justin C. Kasper, Kristopher G. Klein, Jia Huang, Michael L. Stevens, et al.. Kinetic-scale Spectral Features of Cross Helicity and Residual Energy in the Inner Heliosphere. The Astrophysical Journal Supplement, 2020, 246 (2), pp.52. ⟨10.3847/1538-4365/ab60a2⟩. ⟨insu-02942545⟩
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