Kinetic‐Scale Turbulence in the Venusian Magnetosheath

T. Dudok de Wit; K. Goetz; K. Goodrich; J. Gruesbeck; J. Halekas; P. R. Harvey; G. G. Howes; J. C. Kasper; K. Korreck; D. Larson; R. Livi; R. J. MacDowall; D. M. Malaspina; T. A. Bowen; S. D. Bale; A. Mallet; R. Bandyopadhyay; M. D. McManus; J. W. Bonnell; B. Page; M. Pulupa; A. Case; A. Chasapis; N. Raouafi; C. H. K. Chen; M. L. Stevens; S. Curry; P. Whittlesey

doi:10.1029/2020GL090783

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Kinetic‐Scale Turbulence in the Venusian Magnetosheath

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Kinetic‐Scale Turbulence in the Venusian Magnetosheath

T. Dudok de Wit, K. Goetz, K. Goodrich, J. Gruesbeck, J. Halekas, P. R. Harvey, G. G. Howes, J. C. Kasper, K. Korreck, D. Larson, …

Geophysical research letters, Vol.48(2), e2020GL090783

01/28/2021

DOI: 10.1029/2020GL090783

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Abstract

While not specifically designed as a planetary mission, NASA's Parker Solar Probe (PSP) mission uses a series of Venus gravity assists (VGAs) in order to reduce its perihelion distance. These orbital maneuvers provide the opportunity for direct measurements of the Venus plasma environment at high cadence. We present first observations of kinetic scale turbulence in the Venus magnetosheath from the first two VGAs. In VGA1, PSP observed a quasi‐parallel shock, β ∼ 1 magnetosheath plasma, and a kinetic range scaling of k−2.9. VGA2 was characterized by a quasi‐perpendicular shock with β ∼ 10, and a steep k−3.4 spectral scaling. Temperature anisotropy measurements from VGA2 suggest an active mirror mode instability. Significant coherent waves are present in both encounters at sub‐ion and electron scales. Using conditioning techniques to exclude these electromagnetic wave events suggests the presence of developed sub‐ion kinetic turbulence in both magnetosheath encounters. Key Points Observations from Parker Solar Probe reveal kinetic scale turbulence in the Venus magnetosheath Differences in kinetic range spectral indices between flyby‐encounters are possibly due to shock geometry and kinetic plasma instabilities

Turbulence

Instability

kinetic

plasma

PSP

Venus

Details

Title: Subtitle: Kinetic‐Scale Turbulence in the Venusian Magnetosheath
Creators: T. Dudok de Wit - Université d'Orléans
K. Goetz - University of Minnesota
K. Goodrich - University of California, Berkeley
J. Gruesbeck - Goddard Space Flight Center
J. Halekas - University of Iowa
P. R. Harvey - University of California
G. G. Howes - University of Iowa
J. C. Kasper - University of Michigan–Ann Arbor
K. Korreck - Smithsonian Astrophysical Observatory
D. Larson - University of California, Berkeley
R. Livi - University of California, Berkeley
R. J. MacDowall - Goddard Space Flight Center
T. A. Bowen - University of California
D. M. Malaspina - Laboratory for Atmospheric and Space Physics
S. D. Bale - University of California, Berkeley
A. Mallet - University of California, Berkeley
R. Bandyopadhyay - Princeton University
M. D. McManus - University of California, Berkeley
J. W. Bonnell - University of California, Berkeley
B. Page - University of California, Berkeley
M. Pulupa - University of California, Berkeley
A. Case - Smithsonian Astrophysical Observatory
A. Chasapis - Laboratory for Atmospheric and Space Physics
N. Raouafi - Johns Hopkins University Applied Physics Laboratory
C. H. K. Chen - Queen Mary University of London
M. L. Stevens - Smithsonian Astrophysical Observatory
S. Curry - University of California, Berkeley
P. Whittlesey - University of California, Berkeley
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.48(2), e2020GL090783
DOI: 10.1029/2020GL090783
ISSN: 0094-8276
eISSN: 1944-8007
Number of pages: 12
Grant note: NASA (NNN06AA01C)
Language: English
Date published: 01/28/2021
Academic Unit: Physics and Astronomy
Record Identifier: 9984428785502771

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