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

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...

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Veröffentlicht in:The Astrophysical journal 2022-03, Vol.927 (1), p.95
Hauptverfasser: Larosa, A., Dudok de Wit, T., Krasnoselskikh, V., Bale, S. D., Agapitov, O., Bonnell, J., Froment, C., Goetz, K., Harvey, P., Halekas, J., Kretzschmar, M., MacDowall, R., Malaspina, David M., Moncuquet, M., Niehof, J., Pulupa, M., Revillet, C.
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container_issue 1
container_start_page 95
container_title The Astrophysical journal
container_volume 927
creator Larosa, A.
Dudok de Wit, T.
Krasnoselskikh, V.
Bale, S. D.
Agapitov, O.
Bonnell, J.
Froment, C.
Goetz, K.
Harvey, P.
Halekas, J.
Kretzschmar, M.
MacDowall, R.
Malaspina, David M.
Moncuquet, M.
Niehof, J.
Pulupa, M.
Revillet, C.
description 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 2 f 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.
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subjects Astrophysics
Coils
Electromagnetic properties
Electron beams
Langmuir waves
Magnetic signatures
Magnetometers
Plasma
Plasma frequencies
Plasma physics
Plasma waves
Propagation modes
Radio emission
Refractive index
Refractivity
Sciences of the Universe
Solar flares
Solar probes
Solar wind
Space plasmas
Spacecraft
Wave propagation
title Langmuir-Slow Extraordinary Mode Magnetic Signature Observations with Parker Solar Probe
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