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

Author
Keywords
Abstract
<p>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\textquoterights first encounter at 0.174 au distance from the Sun.</p>
Year of Publication
2020
Journal
The Astrophysical Journal Supplement Series
Volume
246
Number
Number of Pages
52
Date Published
02/2020
URL
https://iopscience.iop.org/article/10.3847/1538-4365/ab60a2
DOI
10.3847/1538-4365/ab60a2