Journal article
Anticorrelation between the Bulk Speed and the Electron Temperature in the Pristine Solar Wind: First Results from the Parker Solar Probe and Comparison with Helios
The Astrophysical journal. Supplement series, Vol.246(2), p.62
02/01/2020
DOI: 10.3847/1538-4365/ab61fc
Abstract
We discuss the solar wind electron temperatures T-e as measured in the nascent solar wind by Parker Solar Probe during its first perihelion pass. The measurements have been obtained by fitting the high-frequency part of quasithermal noise spectra recorded by the Radio Frequency Spectrometer. In addition we compare these measurements with those obtained by the electrostatic analyzer discussed in Halekas et al. These first electron observations show an anticorrelation between T-e and the wind bulk speed V: this anticorrelation is most likely the remnant of the wellknown mapping observed at 1 au and beyond between the fast wind and its coronal hole sources, where electrons are observed to be cooler than in the quiet corona. We also revisit Helios electron temperature measurements and show, for the first time, that an in situ (T-e, V) anticorrelation is well observed at 0.3 au but disappears as the wind expands, evolves, and mixes with different electron temperature gradients for different wind speeds.
Details
- Title: Subtitle
- Anticorrelation between the Bulk Speed and the Electron Temperature in the Pristine Solar Wind: First Results from the Parker Solar Probe and Comparison with Helios
- Creators
- P. Harvey - University of California, BerkeleyK. Issautier - Université Paris CitéJ. Kasper - Smithsonian Astrophysical ObservatoryK. Korreck - Smithsonian Astrophysical ObservatoryV. Krishna Jagarlamudi - Université Paris CitéN. Lahmiti - Université Paris CitéD. Larson - University of California, BerkeleyA. Lecacheux - Université Paris CitéR. Livi - University of California, BerkeleyR. Macdowall - Goddard Space Flight CenterD. Malaspina - Laboratory for Atmospheric and Space PhysicsM. Martinović - University of ArizonaM. Maksimovic - Université Paris CitéN. Meyer-Vernet - Laboratoire d’études spatiales et d’instrumentation en astrophysiqueS. Bale - University of California, BerkeleyM. Moncuquet - Université Paris CitéM. Pulupa - University of California, BerkeleyL. Berčič - Université Paris CitéJ. Bonnell - University of California, BerkeleyC. Salem - University of California, BerkeleyA. Case - Smithsonian Astrophysical ObservatoryM. Stevens - Smithsonian Astrophysical ObservatoryThierry Dudok de Wit - Laboratoire de Physique et Chimie de l'Environnement et de l'EspaceŠ. Štverák - Institute of Atmospheric PhysicsK. Goetz - University of MinnesotaM. Velli - University of California, Los AngelesJ. Halekas - University of IowaP. Whittlesey - University of California, Berkeley
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal. Supplement series, Vol.246(2), p.62
- DOI
- 10.3847/1538-4365/ab61fc
- ISSN
- 0067-0049
- eISSN
- 1538-4365
- Publisher
- American Astronomical Society
- Language
- English
- Date published
- 02/01/2020
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984429023902771
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