Observational Evidence for Fast Mode Periodic Small-scale Shocks: A New Type of Plasma Phenomenon
We show observational evidence for a new form of collisionless shock in interplanetary space near Mars, small-scale shocks with periodic spacings. Pickup of new ionized hydrogen atoms in a magnetic field aligned with the solar wind direction causes the generation of a magnetosonic wave train through...
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| Veröffentlicht in: | Astrophysical journal. Letters 2020-12, Vol.905 (1), p.L4, Article 4 |
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| container_title | Astrophysical journal. Letters |
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| creator | Shan, Lican Tsurutani, Bruce T. Ohsawa, Yukiharu Mazelle, Christian Huang, Can Du, Aimin Ge, Yasong S. Lu, Quanming |
| description | We show observational evidence for a new form of collisionless shock in interplanetary space near Mars, small-scale shocks with periodic spacings. Pickup of new ionized hydrogen atoms in a magnetic field aligned with the solar wind direction causes the generation of a magnetosonic wave train through an ion beam instability. The waves have a frequency close to the local proton gyrofrequency. This is a similar physical process as for the formation of cometary plasma waves/turbulence. However, for the case of proton pickup near Mars, each individual magnetosonic wave cycle develops into a small-scale shock. So there is a string of fast mode shocks formed with proton gyroperiod spacings. These small-scale shocks display dissipation in the ions and dispersive whistlers. A fraction of ions trapped/reflected at the small-scale shocks are accelerated by the motional electric field. Observational results demonstrate that periodic shocks can perform the same functions as a single supercritical shock in a high-speed flow. |
| doi_str_mv | 10.3847/2041-8213/abcb02 |
| format | Article |
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Pickup of new ionized hydrogen atoms in a magnetic field aligned with the solar wind direction causes the generation of a magnetosonic wave train through an ion beam instability. The waves have a frequency close to the local proton gyrofrequency. This is a similar physical process as for the formation of cometary plasma waves/turbulence. However, for the case of proton pickup near Mars, each individual magnetosonic wave cycle develops into a small-scale shock. So there is a string of fast mode shocks formed with proton gyroperiod spacings. These small-scale shocks display dissipation in the ions and dispersive whistlers. A fraction of ions trapped/reflected at the small-scale shocks are accelerated by the motional electric field. Observational results demonstrate that periodic shocks can perform the same functions as a single supercritical shock in a high-speed flow.</description><identifier>ISSN: 2041-8205</identifier><identifier>EISSN: 2041-8213</identifier><identifier>DOI: 10.3847/2041-8213/abcb02</identifier><language>eng</language><publisher>BRISTOL: The American Astronomical Society</publisher><subject>Astronomy & Astrophysics ; Comets ; Electric fields ; Fluid dynamics ; Gyrofrequency ; Hydrogen ; Hydrogen atoms ; Interplanetary shocks ; Interplanetary space ; Ion beams ; Ions ; Magnetic fields ; Mars ; Observational studies ; Physical Sciences ; Planetary bow shocks ; Plasma waves ; Protons ; Science & Technology ; Solar coronal mass ejection shocks ; Solar magnetic field ; Solar wind ; Stellar bow shocks ; Wave packets ; Whistlers ; Wind direction</subject><ispartof>Astrophysical journal. Letters, 2020-12, Vol.905 (1), p.L4, Article 4</ispartof><rights>2020. The American Astronomical Society. All rights reserved.</rights><rights>Copyright IOP Publishing Dec 01, 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>true</woscitedreferencessubscribed><woscitedreferencescount>9</woscitedreferencescount><woscitedreferencesoriginalsourcerecordid>wos000596720200001</woscitedreferencesoriginalsourcerecordid><citedby>FETCH-LOGICAL-c380t-ce90b18ba315edbe40f1b3de677ae1aa31b37f7b943e3c801bedf94031774b33</citedby><cites>FETCH-LOGICAL-c380t-ce90b18ba315edbe40f1b3de677ae1aa31b37f7b943e3c801bedf94031774b33</cites><orcidid>0000-0003-0223-0494 ; 0000-0002-2354-9261 ; 0000-0002-4345-522X ; 0000-0003-3041-2682</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/2041-8213/abcb02/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>315,781,785,27929,27930,28253,38873,38895,53845,53872</link.rule.ids><linktorsrc>$$Uhttps://iopscience.iop.org/article/10.3847/2041-8213/abcb02$$EView_record_in_IOP_Publishing$$FView_record_in_$$GIOP_Publishing</linktorsrc></links><search><creatorcontrib>Shan, Lican</creatorcontrib><creatorcontrib>Tsurutani, Bruce T.</creatorcontrib><creatorcontrib>Ohsawa, Yukiharu</creatorcontrib><creatorcontrib>Mazelle, Christian</creatorcontrib><creatorcontrib>Huang, Can</creatorcontrib><creatorcontrib>Du, Aimin</creatorcontrib><creatorcontrib>Ge, Yasong S.</creatorcontrib><creatorcontrib>Lu, Quanming</creatorcontrib><title>Observational Evidence for Fast Mode Periodic Small-scale Shocks: A New Type of Plasma Phenomenon</title><title>Astrophysical journal. Letters</title><addtitle>APJL</addtitle><addtitle>ASTROPHYS J LETT</addtitle><addtitle>Astrophys. J. Lett</addtitle><description>We show observational evidence for a new form of collisionless shock in interplanetary space near Mars, small-scale shocks with periodic spacings. Pickup of new ionized hydrogen atoms in a magnetic field aligned with the solar wind direction causes the generation of a magnetosonic wave train through an ion beam instability. The waves have a frequency close to the local proton gyrofrequency. This is a similar physical process as for the formation of cometary plasma waves/turbulence. However, for the case of proton pickup near Mars, each individual magnetosonic wave cycle develops into a small-scale shock. So there is a string of fast mode shocks formed with proton gyroperiod spacings. These small-scale shocks display dissipation in the ions and dispersive whistlers. A fraction of ions trapped/reflected at the small-scale shocks are accelerated by the motional electric field. 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| source | Institute of Physics Open Access Journal Titles |
| subjects | Astronomy & Astrophysics Comets Electric fields Fluid dynamics Gyrofrequency Hydrogen Hydrogen atoms Interplanetary shocks Interplanetary space Ion beams Ions Magnetic fields Mars Observational studies Physical Sciences Planetary bow shocks Plasma waves Protons Science & Technology Solar coronal mass ejection shocks Solar magnetic field Solar wind Stellar bow shocks Wave packets Whistlers Wind direction |
| title | Observational Evidence for Fast Mode Periodic Small-scale Shocks: A New Type of Plasma Phenomenon |
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