Physical Origin of Short Scale Plasma Structures in the Auroral F Region
The E⃗×B⃗ drift instability in the auroral F region of the ionosphere is known to create long scale finger like plasma structures in the presence of a density inhomogeneity and an ambient electric field. These structures elongate mainly along the density inhomogeneity direction. In situ measurements...
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Veröffentlicht in: | Journal of geophysical research. Space physics 2021-03, Vol.126 (3), p.n/a, Article 2020 |
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description | The E⃗×B⃗ drift instability in the auroral F region of the ionosphere is known to create long scale finger like plasma structures in the presence of a density inhomogeneity and an ambient electric field. These structures elongate mainly along the density inhomogeneity direction. In situ measurements as well as scattering experiments have also revealed the existence of small scale structures in this region. The authors propose that such structures are created due to the breakup of the long scale structures on account of their differential stretching from sheared electric fields. Using heuristic physical arguments and dimensional analysis the authors derive a general criterion for the onset of such breakups. The analytic results are validated from numerical simulations of the full set of basic nonlinear equations describing the instability and should prove useful in the prediction and interpretation of the spread F in the high latitude region.
Key Points
The E⃗×B⃗ drift instability in the auroral F region of the earth's ionosphere creates long scale finger like structures. These structures elongate mainly along the density inhomogeneity direction and occasionally break into small scale structures
Using heuristic physical arguments and dimensional analysis The authors derive a general criterion for the onset of such breakups
The criterion is validated using numerical simulations |
doi_str_mv | 10.1029/2020JA028422 |
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Key Points
The E⃗×B⃗ drift instability in the auroral F region of the earth's ionosphere creates long scale finger like structures. These structures elongate mainly along the density inhomogeneity direction and occasionally break into small scale structures
Using heuristic physical arguments and dimensional analysis The authors derive a general criterion for the onset of such breakups
The criterion is validated using numerical simulations</description><identifier>ISSN: 2169-9380</identifier><identifier>EISSN: 2169-9402</identifier><identifier>DOI: 10.1029/2020JA028422</identifier><language>eng</language><publisher>WASHINGTON: Amer Geophysical Union</publisher><subject>Astronomy & Astrophysics ; Density ; Dimensional analysis ; Electric fields ; Elongated structure ; F region ; In situ measurement ; Inhomogeneity ; Ionosphere ; Mathematical analysis ; Nonlinear equations ; Numerical simulations ; Physical Sciences ; Science & Technology ; Spread F</subject><ispartof>Journal of geophysical research. Space physics, 2021-03, Vol.126 (3), p.n/a, Article 2020</ispartof><rights>2021. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>true</woscitedreferencessubscribed><woscitedreferencescount>4</woscitedreferencescount><woscitedreferencesoriginalsourcerecordid>wos000636288800040</woscitedreferencesoriginalsourcerecordid><citedby>FETCH-LOGICAL-c3075-7cb8469127c9d8f51bafd197b6448815d0c06388e84f2542717b110b62cd5fb93</citedby><cites>FETCH-LOGICAL-c3075-7cb8469127c9d8f51bafd197b6448815d0c06388e84f2542717b110b62cd5fb93</cites><orcidid>0000-0003-2507-3727 ; 0000-0001-9878-4330</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2020JA028422$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2020JA028422$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,27924,27925,45574,45575,46409,46833</link.rule.ids></links><search><creatorcontrib>Bisai, N.</creatorcontrib><creatorcontrib>Sen, A.</creatorcontrib><title>Physical Origin of Short Scale Plasma Structures in the Auroral F Region</title><title>Journal of geophysical research. Space physics</title><addtitle>J GEOPHYS RES-SPACE</addtitle><description>The E⃗×B⃗ drift instability in the auroral F region of the ionosphere is known to create long scale finger like plasma structures in the presence of a density inhomogeneity and an ambient electric field. These structures elongate mainly along the density inhomogeneity direction. In situ measurements as well as scattering experiments have also revealed the existence of small scale structures in this region. The authors propose that such structures are created due to the breakup of the long scale structures on account of their differential stretching from sheared electric fields. Using heuristic physical arguments and dimensional analysis the authors derive a general criterion for the onset of such breakups. The analytic results are validated from numerical simulations of the full set of basic nonlinear equations describing the instability and should prove useful in the prediction and interpretation of the spread F in the high latitude region.
Key Points
The E⃗×B⃗ drift instability in the auroral F region of the earth's ionosphere creates long scale finger like structures. These structures elongate mainly along the density inhomogeneity direction and occasionally break into small scale structures
Using heuristic physical arguments and dimensional analysis The authors derive a general criterion for the onset of such breakups
The criterion is validated using numerical simulations</description><subject>Astronomy & Astrophysics</subject><subject>Density</subject><subject>Dimensional analysis</subject><subject>Electric fields</subject><subject>Elongated structure</subject><subject>F region</subject><subject>In situ measurement</subject><subject>Inhomogeneity</subject><subject>Ionosphere</subject><subject>Mathematical analysis</subject><subject>Nonlinear equations</subject><subject>Numerical simulations</subject><subject>Physical Sciences</subject><subject>Science & Technology</subject><subject>Spread F</subject><issn>2169-9380</issn><issn>2169-9402</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>HGBXW</sourceid><recordid>eNqNkF1LwzAUhosoOObu_AEBL7WanDRtclmK2xyDjU2vS5umW0bXzKRF9u-NbIpX4rk5h8Pzno83CG4JfiQYxBNgwLMUA48ALoIBkFiEIsJw-V1Tjq-DkXM77IP7FmGDYLrcHp2WRYMWVm90i0yN1ltjO7T2TYWWTeH2BVp3tpddb5VDnum2CqW9NdbLxmilNtq0N8FVXTROjc55GLyNn1-zaThfTF6ydB5KihMWJrLkkV8NiRQVrxkpi7oiIinjKOKcsApLHFPOFY9qYBEkJCkJwWUMsmJ1KegwuDvNPVjz3ivX5TvT29avzIFhAQBCUE89nChpjXNW1fnB6n1hjznB-Zdd-W-7PM5P-IcqTe2kVq1UPxJvV0xj4Jz7KsKZ7orOf5yZvu289P7_Uk_TM60bdfzzqHw2WaUsppTRTw45iTQ</recordid><startdate>202103</startdate><enddate>202103</enddate><creator>Bisai, N.</creator><creator>Sen, A.</creator><general>Amer Geophysical Union</general><general>Blackwell Publishing Ltd</general><scope>BLEPL</scope><scope>DTL</scope><scope>HGBXW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0003-2507-3727</orcidid><orcidid>https://orcid.org/0000-0001-9878-4330</orcidid></search><sort><creationdate>202103</creationdate><title>Physical Origin of Short Scale Plasma Structures in the Auroral F Region</title><author>Bisai, N. ; Sen, A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3075-7cb8469127c9d8f51bafd197b6448815d0c06388e84f2542717b110b62cd5fb93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Astronomy & Astrophysics</topic><topic>Density</topic><topic>Dimensional analysis</topic><topic>Electric fields</topic><topic>Elongated structure</topic><topic>F region</topic><topic>In situ measurement</topic><topic>Inhomogeneity</topic><topic>Ionosphere</topic><topic>Mathematical analysis</topic><topic>Nonlinear equations</topic><topic>Numerical simulations</topic><topic>Physical Sciences</topic><topic>Science & Technology</topic><topic>Spread F</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bisai, N.</creatorcontrib><creatorcontrib>Sen, A.</creatorcontrib><collection>Web of Science Core Collection</collection><collection>Science Citation Index Expanded</collection><collection>Web of Science - Science Citation Index Expanded - 2021</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of geophysical research. Space physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bisai, N.</au><au>Sen, A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Physical Origin of Short Scale Plasma Structures in the Auroral F Region</atitle><jtitle>Journal of geophysical research. Space physics</jtitle><stitle>J GEOPHYS RES-SPACE</stitle><date>2021-03</date><risdate>2021</risdate><volume>126</volume><issue>3</issue><epage>n/a</epage><artnum>2020</artnum><issn>2169-9380</issn><eissn>2169-9402</eissn><abstract>The E⃗×B⃗ drift instability in the auroral F region of the ionosphere is known to create long scale finger like plasma structures in the presence of a density inhomogeneity and an ambient electric field. These structures elongate mainly along the density inhomogeneity direction. In situ measurements as well as scattering experiments have also revealed the existence of small scale structures in this region. The authors propose that such structures are created due to the breakup of the long scale structures on account of their differential stretching from sheared electric fields. Using heuristic physical arguments and dimensional analysis the authors derive a general criterion for the onset of such breakups. The analytic results are validated from numerical simulations of the full set of basic nonlinear equations describing the instability and should prove useful in the prediction and interpretation of the spread F in the high latitude region.
Key Points
The E⃗×B⃗ drift instability in the auroral F region of the earth's ionosphere creates long scale finger like structures. These structures elongate mainly along the density inhomogeneity direction and occasionally break into small scale structures
Using heuristic physical arguments and dimensional analysis The authors derive a general criterion for the onset of such breakups
The criterion is validated using numerical simulations</abstract><cop>WASHINGTON</cop><pub>Amer Geophysical Union</pub><doi>10.1029/2020JA028422</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0003-2507-3727</orcidid><orcidid>https://orcid.org/0000-0001-9878-4330</orcidid></addata></record> |
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subjects | Astronomy & Astrophysics Density Dimensional analysis Electric fields Elongated structure F region In situ measurement Inhomogeneity Ionosphere Mathematical analysis Nonlinear equations Numerical simulations Physical Sciences Science & Technology Spread F |
title | Physical Origin of Short Scale Plasma Structures in the Auroral F Region |
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