Core Electron Heating By Triggered Ion Acoustic Waves In The Solar Wind

Forrest Mozer; Stuart Bale; Cynthia Cattell; Jasper Halekas; Ivan Vasko; Jae Verniero; Paul Kellogg

doi:10.3847/2041-8213/ac5520

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Core Electron Heating By Triggered Ion Acoustic Waves In The Solar Wind

Journal article

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Peer reviewed

Core Electron Heating By Triggered Ion Acoustic Waves In The Solar Wind

Forrest Mozer, Stuart Bale, Cynthia Cattell, Jasper Halekas, Ivan Vasko, Jae Verniero and Paul Kellogg

The Astrophysical journal. Letters, Vol.927(1), L15

03/01/2022

DOI: 10.3847/2041-8213/ac5520

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Abstract

Perihelion passes on Parker Solar Probe orbits six through nine have been studied to show that solar wind core electrons emerged from 15 solar radii with a temperature of 55 plus or minus 5 eV, independent of the solar wind speed which varied from 300 to 800 km/sec. After leaving 15 solar radii and in the absence of triggered ion acoustic waves at greater distances, the core electron temperature varied with radial distance, R, in solar radii, as 1900R-4/3 electron volts because of cooling produced by the adiabatic expansion. The coefficient, 1900, reproduces the minimum core electron perpendicular temperature observed during the 25 days of observation. In the presence of triggered ion acoustic waves, the core electrons were isotropically heated as much as a factor of two above the minimum temperature, 1900R-4/3 eV. Triggered ion acoustic waves were the only waves observed in coincidence with the electron core heating. They are the dominant wave mode at frequencies greater than 100 Hz at solar distances between 15 and 30 solar radii.

Acoustics

Charged particles

Electron energy

Heating

Ion acoustic waves

Perihelions

Solar probes

Solar wind

Thermal expansion

Wind speed

Details

Title: Subtitle: Core Electron Heating By Triggered Ion Acoustic Waves In The Solar Wind
Creators: Forrest Mozer - University of California, Berkeley
Stuart Bale - University of California, Berkeley
Cynthia Cattell - University of Minnesota
Jasper Halekas - University of Iowa
Ivan Vasko - University of California, Berkeley
Jae Verniero - Goddard Space Flight Center
Paul Kellogg - University of Minnesota
Resource Type: Journal article
Publication Details: The Astrophysical journal. Letters, Vol.927(1), L15
DOI: 10.3847/2041-8213/ac5520
ISSN: 2041-8205
eISSN: 2041-8213
Publisher: American Astronomical Society; Ithaca
Grant note: DOI: 10.13039/100006198, name: NASA ∣ Goddard Space Flight Center, award: NNN06AA01C
Language: English
Date published: 03/01/2022
Academic Unit: Physics and Astronomy
Record Identifier: 9984428785902771

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