Intense low‐frequency chorus waves observed by Van Allen Probes: Fine structures and potential effect on radiation belt electrons
Frequency distribution is a vital factor in determining the contribution of whistler mode chorus to radiation belt electron dynamics. Chorus is usually considered to occur in the frequency range 0.1–0.8fce_eq (with the equatorial electron gyrofrequency fce_eq). We here report an event of intense low...
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| Veröffentlicht in: | Geophysical research letters 2016-02, Vol.43 (3), p.967-977 |
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| container_title | Geophysical research letters |
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| creator | Gao, Zhonglei Su, Zhenpeng Zhu, Hui Xiao, Fuliang Zheng, Huinan Wang, Yuming Shen, Chao Wang, Shui |
| description | Frequency distribution is a vital factor in determining the contribution of whistler mode chorus to radiation belt electron dynamics. Chorus is usually considered to occur in the frequency range 0.1–0.8fce_eq (with the equatorial electron gyrofrequency fce_eq). We here report an event of intense low‐frequency chorus with nearly half of wave power distributed below 0.1fce_eq observed by Van Allen Probe A on 27 August 2014. This emission propagated quasi‐parallel to the magnetic field and exhibited hiss‐like signatures most of the time. The low‐frequency chorus can produce the rapid loss of low‐energy (∼0.1 MeV) electrons, different from the normal chorus. For high‐energy (≥0.5 MeV) electrons, the low‐frequency chorus can yield comparable momentum diffusion to that of the normal chorus but much stronger (up to 2 orders of magnitude) pitch angle diffusion near the loss cone.
Key Points
Intense low‐frequency chorus observed by Van Allen Probes
Low‐frequency chorus exhibited hiss‐like signatures most of the time
Low‐frequency and normal chorus waves have different electron diffusion rates |
| doi_str_mv | 10.1002/2016GL067687 |
| format | Article |
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Key Points
Intense low‐frequency chorus observed by Van Allen Probes
Low‐frequency chorus exhibited hiss‐like signatures most of the time
Low‐frequency and normal chorus waves have different electron diffusion rates</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1002/2016GL067687</identifier><language>eng</language><publisher>Washington: John Wiley & Sons, Inc</publisher><subject>Chorus waves ; cyclotron resonance ; Diffusion ; Electric power distribution ; Electrons ; Fine structure ; Frequency distribution ; Frequency ranges ; Geophysics ; Gyrofrequency ; hiss‐like band ; low‐frequency chorus ; Magnetic field ; Magnetic fields ; Momentum ; Pitch (inclination) ; Pitch angle ; Radiation ; radiation belt ; Radiation belt electrons ; Radiation belts ; rising tones ; Signatures ; Van Allen Probes ; Wave power</subject><ispartof>Geophysical research letters, 2016-02, Vol.43 (3), p.967-977</ispartof><rights>2016. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c6440-5211e5f7765a41a4ed260ae7390092137d6538795c1ce7ab62675859fb1260603</citedby><cites>FETCH-LOGICAL-c6440-5211e5f7765a41a4ed260ae7390092137d6538795c1ce7ab62675859fb1260603</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2016GL067687$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2016GL067687$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,1427,11493,27901,27902,45550,45551,46384,46443,46808,46867</link.rule.ids></links><search><creatorcontrib>Gao, Zhonglei</creatorcontrib><creatorcontrib>Su, Zhenpeng</creatorcontrib><creatorcontrib>Zhu, Hui</creatorcontrib><creatorcontrib>Xiao, Fuliang</creatorcontrib><creatorcontrib>Zheng, Huinan</creatorcontrib><creatorcontrib>Wang, Yuming</creatorcontrib><creatorcontrib>Shen, Chao</creatorcontrib><creatorcontrib>Wang, Shui</creatorcontrib><title>Intense low‐frequency chorus waves observed by Van Allen Probes: Fine structures and potential effect on radiation belt electrons</title><title>Geophysical research letters</title><description>Frequency distribution is a vital factor in determining the contribution of whistler mode chorus to radiation belt electron dynamics. Chorus is usually considered to occur in the frequency range 0.1–0.8fce_eq (with the equatorial electron gyrofrequency fce_eq). We here report an event of intense low‐frequency chorus with nearly half of wave power distributed below 0.1fce_eq observed by Van Allen Probe A on 27 August 2014. This emission propagated quasi‐parallel to the magnetic field and exhibited hiss‐like signatures most of the time. The low‐frequency chorus can produce the rapid loss of low‐energy (∼0.1 MeV) electrons, different from the normal chorus. For high‐energy (≥0.5 MeV) electrons, the low‐frequency chorus can yield comparable momentum diffusion to that of the normal chorus but much stronger (up to 2 orders of magnitude) pitch angle diffusion near the loss cone.
Key Points
Intense low‐frequency chorus observed by Van Allen Probes
Low‐frequency chorus exhibited hiss‐like signatures most of the time
Low‐frequency and normal chorus waves have different electron diffusion rates</description><subject>Chorus waves</subject><subject>cyclotron resonance</subject><subject>Diffusion</subject><subject>Electric power distribution</subject><subject>Electrons</subject><subject>Fine structure</subject><subject>Frequency distribution</subject><subject>Frequency ranges</subject><subject>Geophysics</subject><subject>Gyrofrequency</subject><subject>hiss‐like band</subject><subject>low‐frequency chorus</subject><subject>Magnetic field</subject><subject>Magnetic fields</subject><subject>Momentum</subject><subject>Pitch (inclination)</subject><subject>Pitch angle</subject><subject>Radiation</subject><subject>radiation belt</subject><subject>Radiation belt electrons</subject><subject>Radiation belts</subject><subject>rising tones</subject><subject>Signatures</subject><subject>Van Allen Probes</subject><subject>Wave power</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqN0c-KFDEQBvAgCo6jNx8g4MWDs1YlnT_tbVnc2YUBRdRrk05XYy_ZZEy6d5ib4Av4jD6JkfEgHhZPKcKPKj4-xp4jnCGAeC0A9XYH2mhrHrAVtk2zsQDmIVsBtHUWRj9mT0q5AQAJElfs-3WcKRbiIR1-fvsxZvq6UPRH7r-kvBR-cHdUeOoL5TsaeH_kn13k5yFQ5O9z6qm84ZdTJF7mvPh5yVW7OPB9qmvnyQVO40h-5iny7IbJzVOdegozp1D_c4rlKXs0ulDo2Z93zT5dvv14cbXZvdteX5zvNl43DWyUQCQ1GqOVa9A1NAgNjoxsaziB0gxaSWta5dGTcb0W2iir2rHHCjXINXt52rvPqaYsc3c7FU8huEhpKR1asFJbgep_KDStgnp2zV78Q2_SkmMN0glpQLeI9l6FtS5lDUhT1auT8jmVkmns9nm6dfnYIXS_K-7-rrhyceKHKdDxXtttP-yUbOuVX7MxpnQ</recordid><startdate>20160216</startdate><enddate>20160216</enddate><creator>Gao, Zhonglei</creator><creator>Su, Zhenpeng</creator><creator>Zhu, Hui</creator><creator>Xiao, Fuliang</creator><creator>Zheng, Huinan</creator><creator>Wang, Yuming</creator><creator>Shen, Chao</creator><creator>Wang, Shui</creator><general>John Wiley & Sons, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>7UA</scope><scope>C1K</scope></search><sort><creationdate>20160216</creationdate><title>Intense low‐frequency chorus waves observed by Van Allen Probes: Fine structures and potential effect on radiation belt electrons</title><author>Gao, Zhonglei ; Su, Zhenpeng ; Zhu, Hui ; Xiao, Fuliang ; Zheng, Huinan ; Wang, Yuming ; Shen, Chao ; Wang, Shui</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c6440-5211e5f7765a41a4ed260ae7390092137d6538795c1ce7ab62675859fb1260603</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Chorus waves</topic><topic>cyclotron resonance</topic><topic>Diffusion</topic><topic>Electric power distribution</topic><topic>Electrons</topic><topic>Fine structure</topic><topic>Frequency distribution</topic><topic>Frequency ranges</topic><topic>Geophysics</topic><topic>Gyrofrequency</topic><topic>hiss‐like band</topic><topic>low‐frequency chorus</topic><topic>Magnetic field</topic><topic>Magnetic fields</topic><topic>Momentum</topic><topic>Pitch (inclination)</topic><topic>Pitch angle</topic><topic>Radiation</topic><topic>radiation belt</topic><topic>Radiation belt electrons</topic><topic>Radiation belts</topic><topic>rising tones</topic><topic>Signatures</topic><topic>Van Allen Probes</topic><topic>Wave power</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gao, Zhonglei</creatorcontrib><creatorcontrib>Su, Zhenpeng</creatorcontrib><creatorcontrib>Zhu, Hui</creatorcontrib><creatorcontrib>Xiao, Fuliang</creatorcontrib><creatorcontrib>Zheng, Huinan</creatorcontrib><creatorcontrib>Wang, Yuming</creatorcontrib><creatorcontrib>Shen, Chao</creatorcontrib><creatorcontrib>Wang, Shui</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gao, Zhonglei</au><au>Su, Zhenpeng</au><au>Zhu, Hui</au><au>Xiao, Fuliang</au><au>Zheng, Huinan</au><au>Wang, Yuming</au><au>Shen, Chao</au><au>Wang, Shui</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Intense low‐frequency chorus waves observed by Van Allen Probes: Fine structures and potential effect on radiation belt electrons</atitle><jtitle>Geophysical research letters</jtitle><date>2016-02-16</date><risdate>2016</risdate><volume>43</volume><issue>3</issue><spage>967</spage><epage>977</epage><pages>967-977</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>Frequency distribution is a vital factor in determining the contribution of whistler mode chorus to radiation belt electron dynamics. Chorus is usually considered to occur in the frequency range 0.1–0.8fce_eq (with the equatorial electron gyrofrequency fce_eq). We here report an event of intense low‐frequency chorus with nearly half of wave power distributed below 0.1fce_eq observed by Van Allen Probe A on 27 August 2014. This emission propagated quasi‐parallel to the magnetic field and exhibited hiss‐like signatures most of the time. The low‐frequency chorus can produce the rapid loss of low‐energy (∼0.1 MeV) electrons, different from the normal chorus. For high‐energy (≥0.5 MeV) electrons, the low‐frequency chorus can yield comparable momentum diffusion to that of the normal chorus but much stronger (up to 2 orders of magnitude) pitch angle diffusion near the loss cone.
Key Points
Intense low‐frequency chorus observed by Van Allen Probes
Low‐frequency chorus exhibited hiss‐like signatures most of the time
Low‐frequency and normal chorus waves have different electron diffusion rates</abstract><cop>Washington</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/2016GL067687</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Chorus waves cyclotron resonance Diffusion Electric power distribution Electrons Fine structure Frequency distribution Frequency ranges Geophysics Gyrofrequency hiss‐like band low‐frequency chorus Magnetic field Magnetic fields Momentum Pitch (inclination) Pitch angle Radiation radiation belt Radiation belt electrons Radiation belts rising tones Signatures Van Allen Probes Wave power |
| title | Intense low‐frequency chorus waves observed by Van Allen Probes: Fine structures and potential effect on radiation belt electrons |
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