Langmuir-Slow Extraordinary Mode Magnetic Signature Observations with Parker Solar Probe

A. Larosa; T. Dudok de Wit; V. Krasnoselskikh; S. D. Bale; O. Agapitov; J. Bonnell; C. Froment; K. Goetz; P. Harvey; J. Halekas; M. Kretzschmar; R. MacDowall; David M. Malaspina; M. Moncuquet; J. Niehof; M. Pulupa; C. Revillet

doi:10.3847/1538-4357/ac4e85

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Langmuir-Slow Extraordinary Mode Magnetic Signature Observations with Parker Solar Probe

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Langmuir-Slow Extraordinary Mode Magnetic Signature Observations with Parker Solar Probe

A. Larosa, T. Dudok de Wit, V. Krasnoselskikh, S. D. Bale, O. Agapitov, J. Bonnell, C. Froment, K. Goetz, P. Harvey, J. Halekas, …

The Astrophysical journal, Vol.927(1), p.95

03/01/2022

DOI: 10.3847/1538-4357/ac4e85

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Abstract

Radio emission from interplanetary shocks, planetary foreshocks, and some solar flares occurs in the so-called "plasma emission" framework. The generally accepted scenario begins with electrostatic Langmuir waves that are driven by a suprathermal electron beam on the Landau resonance. These Langmuir waves then mode-convert to freely propagating electromagnetic emissions at the local plasma frequency f ( pe ) and/or its harmonic 2f ( pe ). However, the details of the physics of mode conversion are unclear, and so far the magnetic component of the plasma waves has not been definitively measured. Several spacecraft have measured quasi-monochromatic Langmuir or slow extraordinary modes (sometimes called z-modes) in the solar wind. These coherent waves are expected to have a weak magnetic component, which has never been observed in an unambiguous way. Here we report on the direct measurement of the magnetic signature of these waves using the Search Coil Magnetometer sensor of the Parker Solar Probe/FIELDS instrument. Using simulations of wave propagation in an inhomogeneous plasma, we show that the appearance of the magnetic component of the slow extraordinary mode is highly influenced by the presence of density inhomogeneities that occasionally cause the refractive index to drop to low values where the wave has strong electromagnetic properties.

Astronomy & Astrophysics

Physical Sciences

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Details

Title: Subtitle: Langmuir-Slow Extraordinary Mode Magnetic Signature Observations with Parker Solar Probe
Creators: A. Larosa - Université d'Orléans
T. Dudok de Wit - CNRS, CNES, LPC2E, 3A Ave Rech Sci, Orleans, France
V. Krasnoselskikh - University of California, Berkeley
S. D. Bale - University of California, Berkeley
O. Agapitov - University of California, Berkeley
J. Bonnell - University of California, Berkeley
C. Froment - Université d'Orléans
K. Goetz - University of Minnesota
P. Harvey - University of California, Berkeley
J. Halekas - University of Iowa
M. Kretzschmar - Université d'Orléans
R. MacDowall - Goddard Space Flight Center
David M. Malaspina - University of Colorado Boulder
M. Moncuquet - Observatoire de Paris
J. Niehof - University of New Hampshire
M. Pulupa - University of California, Berkeley
C. Revillet - Université d'Orléans
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.927(1), p.95
DOI: 10.3847/1538-4357/ac4e85
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: IOP Publishing Ltd
Number of pages: 8
Grant note: 1914670 / NSF; National Science Foundation (NSF) NNN06AA01C / Johns Hopkins Applied Physics Laboratory as part of NASA's Living with a Star (LWS) program 80NSSC20K0697; 80NSSC21K1770 / NASA; National Aeronautics & Space Administration (NASA) 80NSSC20K0218; 80NNSC19K0848; 80NSSC22K0417 / NASA Living with a Star (LWS) program; National Aeronautics & Space Administration (NASA)
Language: English
Date published: 03/01/2022
Academic Unit: Physics and Astronomy
Record Identifier: 9984428805302771

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