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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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. |
doi_str_mv | 10.3847/1538-4357/ac4e85 |
format | Article |
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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.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/ac4e85</identifier><language>eng</language><publisher>Philadelphia: The American Astronomical Society</publisher><subject>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</subject><ispartof>The Astrophysical journal, 2022-03, Vol.927 (1), p.95</ispartof><rights>2022. The Author(s). Published by the American Astronomical Society.</rights><rights>2022. The Author(s). Published by the American Astronomical Society. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>Attribution</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c385t-7cec85d3d43ec050aebf8b3b092c33bcd5aae2cdb67628953a8391c8c1a981103</citedby><cites>FETCH-LOGICAL-c385t-7cec85d3d43ec050aebf8b3b092c33bcd5aae2cdb67628953a8391c8c1a981103</cites><orcidid>0000-0002-6809-6219 ; 0000-0002-0675-7907 ; 0000-0003-3112-4201 ; 0000-0002-4401-0943 ; 0000-0001-5315-2890 ; 0000-0002-9621-0365 ; 0000-0001-5796-6138 ; 0000-0003-4582-7055 ; 0000-0003-1191-1558 ; 0000-0003-0420-3633 ; 0000-0002-7653-9147 ; 0000-0002-1989-3596 ; 0000-0001-6427-1596 ; 0000-0001-6286-5809 ; 0000-0001-5258-6128 ; 0000-0002-1573-7457 ; 0000-0002-6938-0166</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/ac4e85/pdf$$EPDF$$P50$$Giop$$Hfree_for_read</linktopdf><link.rule.ids>230,314,776,780,860,881,27901,27902,38867,53842</link.rule.ids><backlink>$$Uhttps://insu.hal.science/insu-03611700$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Larosa, A.</creatorcontrib><creatorcontrib>Dudok de Wit, T.</creatorcontrib><creatorcontrib>Krasnoselskikh, V.</creatorcontrib><creatorcontrib>Bale, S. D.</creatorcontrib><creatorcontrib>Agapitov, O.</creatorcontrib><creatorcontrib>Bonnell, J.</creatorcontrib><creatorcontrib>Froment, C.</creatorcontrib><creatorcontrib>Goetz, K.</creatorcontrib><creatorcontrib>Harvey, P.</creatorcontrib><creatorcontrib>Halekas, J.</creatorcontrib><creatorcontrib>Kretzschmar, M.</creatorcontrib><creatorcontrib>MacDowall, R.</creatorcontrib><creatorcontrib>Malaspina, David M.</creatorcontrib><creatorcontrib>Moncuquet, M.</creatorcontrib><creatorcontrib>Niehof, J.</creatorcontrib><creatorcontrib>Pulupa, M.</creatorcontrib><creatorcontrib>Revillet, C.</creatorcontrib><title>Langmuir-Slow Extraordinary Mode Magnetic Signature Observations with Parker Solar Probe</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><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.</description><subject>Astrophysics</subject><subject>Coils</subject><subject>Electromagnetic properties</subject><subject>Electron beams</subject><subject>Langmuir waves</subject><subject>Magnetic signatures</subject><subject>Magnetometers</subject><subject>Plasma</subject><subject>Plasma frequencies</subject><subject>Plasma physics</subject><subject>Plasma waves</subject><subject>Propagation modes</subject><subject>Radio emission</subject><subject>Refractive index</subject><subject>Refractivity</subject><subject>Sciences of the Universe</subject><subject>Solar flares</subject><subject>Solar probes</subject><subject>Solar wind</subject><subject>Space plasmas</subject><subject>Spacecraft</subject><subject>Wave propagation</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>O3W</sourceid><recordid>eNp1kMFLwzAUh4MoOKd3jwFvYl3SNG16HGM6ocPBFHYLr2m2ZW7NTNpN_3tbKvPk6fEe3-_H40PolpJHJqJkQDkTQcR4MgAVacHPUO90Okc9QkgUxCxZXKIr7zftGqZpDy0yKFe72rhgvrVHPP6qHFhXmBLcN57aQuMprEpdGYXnZlVCVTuNX3Ov3QEqY0uPj6Za4xm4D-3w3G7B4Zmzub5GF0vYen3zO_vo_Wn8NpoE2evzy2iYBYoJXgWJ0krwghUR04pwAjpfipzlJA0VY7kqOIAOVZHHSRyKlDMQLKVKKAqpoJSwPrrvetewlXtnds3j0oKRk2EmTelrSVhMaULIgTbwXQfvnf2sta_kxtaubP6TYRw1UlJO0oYiHaWc9d7p5amXEtnKlq1Z2ZqVnewm8tBFjN3_df6L_wDje4Bm</recordid><startdate>20220301</startdate><enddate>20220301</enddate><creator>Larosa, A.</creator><creator>Dudok de Wit, T.</creator><creator>Krasnoselskikh, V.</creator><creator>Bale, S. D.</creator><creator>Agapitov, O.</creator><creator>Bonnell, J.</creator><creator>Froment, C.</creator><creator>Goetz, K.</creator><creator>Harvey, P.</creator><creator>Halekas, J.</creator><creator>Kretzschmar, M.</creator><creator>MacDowall, R.</creator><creator>Malaspina, David M.</creator><creator>Moncuquet, M.</creator><creator>Niehof, J.</creator><creator>Pulupa, M.</creator><creator>Revillet, C.</creator><general>The American Astronomical Society</general><general>IOP Publishing</general><general>American Astronomical Society</general><scope>O3W</scope><scope>TSCCA</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0002-6809-6219</orcidid><orcidid>https://orcid.org/0000-0002-0675-7907</orcidid><orcidid>https://orcid.org/0000-0003-3112-4201</orcidid><orcidid>https://orcid.org/0000-0002-4401-0943</orcidid><orcidid>https://orcid.org/0000-0001-5315-2890</orcidid><orcidid>https://orcid.org/0000-0002-9621-0365</orcidid><orcidid>https://orcid.org/0000-0001-5796-6138</orcidid><orcidid>https://orcid.org/0000-0003-4582-7055</orcidid><orcidid>https://orcid.org/0000-0003-1191-1558</orcidid><orcidid>https://orcid.org/0000-0003-0420-3633</orcidid><orcidid>https://orcid.org/0000-0002-7653-9147</orcidid><orcidid>https://orcid.org/0000-0002-1989-3596</orcidid><orcidid>https://orcid.org/0000-0001-6427-1596</orcidid><orcidid>https://orcid.org/0000-0001-6286-5809</orcidid><orcidid>https://orcid.org/0000-0001-5258-6128</orcidid><orcidid>https://orcid.org/0000-0002-1573-7457</orcidid><orcidid>https://orcid.org/0000-0002-6938-0166</orcidid></search><sort><creationdate>20220301</creationdate><title>Langmuir-Slow Extraordinary Mode Magnetic Signature Observations with Parker Solar Probe</title><author>Larosa, A. ; Dudok de Wit, T. ; Krasnoselskikh, V. ; Bale, S. 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D.</au><au>Agapitov, O.</au><au>Bonnell, J.</au><au>Froment, C.</au><au>Goetz, K.</au><au>Harvey, P.</au><au>Halekas, J.</au><au>Kretzschmar, M.</au><au>MacDowall, R.</au><au>Malaspina, David M.</au><au>Moncuquet, M.</au><au>Niehof, J.</au><au>Pulupa, M.</au><au>Revillet, C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Langmuir-Slow Extraordinary Mode Magnetic Signature Observations with Parker Solar Probe</atitle><jtitle>The Astrophysical journal</jtitle><stitle>APJ</stitle><addtitle>Astrophys. J</addtitle><date>2022-03-01</date><risdate>2022</risdate><volume>927</volume><issue>1</issue><spage>95</spage><pages>95-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><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 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.</abstract><cop>Philadelphia</cop><pub>The American Astronomical Society</pub><doi>10.3847/1538-4357/ac4e85</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-6809-6219</orcidid><orcidid>https://orcid.org/0000-0002-0675-7907</orcidid><orcidid>https://orcid.org/0000-0003-3112-4201</orcidid><orcidid>https://orcid.org/0000-0002-4401-0943</orcidid><orcidid>https://orcid.org/0000-0001-5315-2890</orcidid><orcidid>https://orcid.org/0000-0002-9621-0365</orcidid><orcidid>https://orcid.org/0000-0001-5796-6138</orcidid><orcidid>https://orcid.org/0000-0003-4582-7055</orcidid><orcidid>https://orcid.org/0000-0003-1191-1558</orcidid><orcidid>https://orcid.org/0000-0003-0420-3633</orcidid><orcidid>https://orcid.org/0000-0002-7653-9147</orcidid><orcidid>https://orcid.org/0000-0002-1989-3596</orcidid><orcidid>https://orcid.org/0000-0001-6427-1596</orcidid><orcidid>https://orcid.org/0000-0001-6286-5809</orcidid><orcidid>https://orcid.org/0000-0001-5258-6128</orcidid><orcidid>https://orcid.org/0000-0002-1573-7457</orcidid><orcidid>https://orcid.org/0000-0002-6938-0166</orcidid><oa>free_for_read</oa></addata></record> |
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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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