Parker Solar Probe Evidence for the Absence of Whistlers Close to the Sun to Scatter Strahl and to Regulate Heat Flux

C. Cattell; A. Breneman; J. Dombeck; E. Hanson; M. Johnson; J. Halekas; S. D. Bale; T Dudok de Wit; K. Goetz; K. Goodrich; D. Malaspina; M. Pulupa; T. Case; J. C. Kasper; D. Larson; M. Stevens; P. Whittlesey

doi:10.3847/2041-8213/ac4015

Back

Parker Solar Probe Evidence for the Absence of Whistlers Close to the Sun to Scatter Strahl and to Regulate Heat Flux

Journal article

Open access

Peer reviewed

Parker Solar Probe Evidence for the Absence of Whistlers Close to the Sun to Scatter Strahl and to Regulate Heat Flux

C. Cattell, A. Breneman, J. Dombeck, E. Hanson, M. Johnson, J. Halekas, S. D. Bale, T Dudok de Wit, K. Goetz, K. Goodrich, …

Astrophysical journal. Letters, Vol.924(2), p.L33

01/01/2022

DOI: 10.3847/2041-8213/ac4015

Files and links (1)

url

https://doi.org/10.3847/2041-8213/ac4015View

Published (Version of record) Open Access

Abstract

Using the Parker Solar Probe FIELDS bandpass-filter data and SWEAP electron data from Encounters 1 through 9, we show statistical properties of narrowband whistlers from similar to 16 R (s) to similar to 130 R (s), and compare wave occurrence to electron properties including beta, temperature anisotropy, and heat flux. Whistlers are very rarely observed inside similar to 28 R (s) (similar to 0.13 au). Outside 28 R (s), they occur within a narrow range of parallel electron beta from similar to 1 to 10, and with a beta-heat flux occurrence consistent with the whistler heat flux fan instability. Because electron distributions inside similar to 30 R (s) display signatures of the ambipolar electric field, the lack of whistlers suggests that the modification of the electron distribution function associated with the ambipolar electric field or changes in other plasma properties must result in lower instability limits for the other modes (including the observed solitary waves and ion acoustic waves) that are observed close to the Sun. The lack of narrowband whistler-mode waves close to the Sun and in regions of either low (<0.1) or high (>10) beta is also significant for the understanding and modeling of the evolution of flare-accelerated electrons and the regulation of heat flux in astrophysical settings including other stellar winds, the interstellar medium, accretion disks, and the intragalaxy cluster medium.

Physical Sciences

Astronomy & Astrophysics

Science & Technology

Details

Title: Subtitle: Parker Solar Probe Evidence for the Absence of Whistlers Close to the Sun to Scatter Strahl and to Regulate Heat Flux
Creators: C. Cattell - University of Minnesota
A. Breneman - Goddard Space Flight Center
J. Dombeck - University of Minnesota
E. Hanson - University of Minnesota
M. Johnson - University of Minnesota
J. Halekas - University of Iowa
S. D. Bale - University of California, Berkeley
T Dudok de Wit - Université d'Orléans
K. Goetz - University of Minnesota
K. Goodrich - West Virginia University
D. Malaspina - Laboratory for Atmospheric and Space Physics
M. Pulupa - University of California, Berkeley
T. Case - Smithsonian Astrophysical Observatory
J. C. Kasper - 1366 Technologies (United States)
D. Larson - University of California, Berkeley
M. Stevens - Smithsonian Astrophysical Observatory
P. Whittlesey - University of California, Berkeley
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.924(2), p.L33
DOI: 10.3847/2041-8213/ac4015
ISSN: 2041-8205
eISSN: 2041-8213
Publisher: IOP Publishing Ltd
Number of pages: 10
Grant note: CNES; Centre National D'etudes Spatiales NNN06AA01C / NASA; National Aeronautics & Space Administration (NASA)
Language: English
Date published: 01/01/2022
Academic Unit: Physics and Astronomy
Record Identifier: 9984429015002771

Metrics

3 Record Views

32 Times Cited - Web of Science

See more details