Ionospheric Footprints of Detached Magnetotail Interchange Heads
Pritchett and Coroniti (2011, https://doi.org/10.1029/2011GL047527, 2013, https://doi.org/10.1029/2012JA018143) have predicted that the kinetic ballooning/interchange instability (BICI) can provoke reconnection onsets that lead to detached azimuthally thin earthward intrusions (heads) of depleted pl...
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| Veröffentlicht in: | Geophysical research letters 2019-07, Vol.46 (13), p.7237-7247 |
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| creator | Panov, E. V. Baumjohann, W. Nakamura, R. Pritchett, P. L. Weygand, J. M. Kubyshkina, M. V. |
| description | Pritchett and Coroniti (2011, https://doi.org/10.1029/2011GL047527, 2013, https://doi.org/10.1029/2012JA018143) have predicted that the kinetic ballooning/interchange instability (BICI) can provoke reconnection onsets that lead to detached azimuthally thin earthward intrusions (heads) of depleted plasma tubes when
βeq⩽ 100. Such detached BICI heads would be seen as localized earthward‐propagating dipolarization fronts. Using Time History of Events and Macroscale Interactions during Substorms observations in the plasma sheet at XGSM≈−11RE and conjugate All‐Sky Imager and magnetometer networks observations on the ground, we show four examples when prominent dipolarization fronts with moderate earthward flows were observed amidst azimuthally drifting interchange heads and concurrently with the ionospheric current intensifications near Time History of Events and Macroscale Interactions during Substorms footprints and auroral bright spots originating from dimmer azimuthal beads/rays. These events support the idea that some of the BICI heads detach from the region with reversed radial gradient of BZ due to local reconnection. The detached BICI heads propagate earthward‐driving ionospheric pseudo‐breakups.
Plain Language Summary
The Earth's magnetotail periodically accumulates energy in form of the magnetic flux in the tail lobes and dumps the energy as fast earthward and tailward plasma flows, which are produced by magnetic reconnection. Yet there is no consensus on what magnetotail processes may lead to reconnection. Examples of multiprobe space observations are used to reveal the possible process that might be important for azimuthally localized reconnection in the tail that leads to pseudo‐breakups in aurora and local ionospheric current systems. The examples show the appearance of earthward‐propagating reconnection (dipolarization) fronts amidst azimuthally propagating clumps of more dipolar field lines that were produced by an instability which was predicted to lead to localized reconnection by earlier plasma computer simulations. The conjugate ground auroral and magnetic field observations support the reconnection fronts' origin hypothesis.
Key Points
Azimuthally drifting interchange heads in the near‐Earth plasma sheet may detach and propagate earthward
Detached interchange heads are seen as localized dipolarization fronts amidst azimuthally drifting interchange heads
The detachments cause ionospheric pseudo‐breakups with local current system and auroral |
| doi_str_mv | 10.1029/2019GL083070 |
| format | Article |
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βeq⩽ 100. Such detached BICI heads would be seen as localized earthward‐propagating dipolarization fronts. Using Time History of Events and Macroscale Interactions during Substorms observations in the plasma sheet at XGSM≈−11RE and conjugate All‐Sky Imager and magnetometer networks observations on the ground, we show four examples when prominent dipolarization fronts with moderate earthward flows were observed amidst azimuthally drifting interchange heads and concurrently with the ionospheric current intensifications near Time History of Events and Macroscale Interactions during Substorms footprints and auroral bright spots originating from dimmer azimuthal beads/rays. These events support the idea that some of the BICI heads detach from the region with reversed radial gradient of BZ due to local reconnection. The detached BICI heads propagate earthward‐driving ionospheric pseudo‐breakups.
Plain Language Summary
The Earth's magnetotail periodically accumulates energy in form of the magnetic flux in the tail lobes and dumps the energy as fast earthward and tailward plasma flows, which are produced by magnetic reconnection. Yet there is no consensus on what magnetotail processes may lead to reconnection. Examples of multiprobe space observations are used to reveal the possible process that might be important for azimuthally localized reconnection in the tail that leads to pseudo‐breakups in aurora and local ionospheric current systems. The examples show the appearance of earthward‐propagating reconnection (dipolarization) fronts amidst azimuthally propagating clumps of more dipolar field lines that were produced by an instability which was predicted to lead to localized reconnection by earlier plasma computer simulations. The conjugate ground auroral and magnetic field observations support the reconnection fronts' origin hypothesis.
Key Points
Azimuthally drifting interchange heads in the near‐Earth plasma sheet may detach and propagate earthward
Detached interchange heads are seen as localized dipolarization fronts amidst azimuthally drifting interchange heads
The detachments cause ionospheric pseudo‐breakups with local current system and auroral bright spots originating from azimuthal beads/rays</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1029/2019GL083070</identifier><language>eng</language><publisher>Washington: John Wiley & Sons, Inc</publisher><subject>auroral substorms ; Auroras ; ballooning/interchange instability ; Beads ; Bright spots ; Clumps ; Computer simulation ; Conjugates ; Detaching ; dipolarization front ; Earth ; Footprints ; Fronts ; Instability ; ionosphere ; Ionospheric currents ; Ionospheric propagation ; Magnetic field ; Magnetic fields ; Magnetic flux ; Magnetic reconnection ; Magnetometers ; Magnetotails ; Mathematical models ; Plasma ; pseudo‐breakup ; reconnection ; Stability ; Tubes</subject><ispartof>Geophysical research letters, 2019-07, Vol.46 (13), p.7237-7247</ispartof><rights>2019. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4102-a035e47a8a337cf85a2670f8f76b3af6332d00a72c51d2c6fc58120de885bfa13</citedby><cites>FETCH-LOGICAL-c4102-a035e47a8a337cf85a2670f8f76b3af6332d00a72c51d2c6fc58120de885bfa13</cites><orcidid>0000-0002-2620-9211 ; 0000-0003-3609-235X ; 0000-0001-6271-0110 ; 0000-0003-2085-1171 ; 0000-0001-5897-9547 ; 0000-0001-7996-2277</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%2F2019GL083070$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2019GL083070$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,777,781,1412,1428,11495,27905,27906,45555,45556,46390,46449,46814,46873</link.rule.ids></links><search><creatorcontrib>Panov, E. V.</creatorcontrib><creatorcontrib>Baumjohann, W.</creatorcontrib><creatorcontrib>Nakamura, R.</creatorcontrib><creatorcontrib>Pritchett, P. L.</creatorcontrib><creatorcontrib>Weygand, J. M.</creatorcontrib><creatorcontrib>Kubyshkina, M. V.</creatorcontrib><title>Ionospheric Footprints of Detached Magnetotail Interchange Heads</title><title>Geophysical research letters</title><description>Pritchett and Coroniti (2011, https://doi.org/10.1029/2011GL047527, 2013, https://doi.org/10.1029/2012JA018143) have predicted that the kinetic ballooning/interchange instability (BICI) can provoke reconnection onsets that lead to detached azimuthally thin earthward intrusions (heads) of depleted plasma tubes when
βeq⩽ 100. Such detached BICI heads would be seen as localized earthward‐propagating dipolarization fronts. Using Time History of Events and Macroscale Interactions during Substorms observations in the plasma sheet at XGSM≈−11RE and conjugate All‐Sky Imager and magnetometer networks observations on the ground, we show four examples when prominent dipolarization fronts with moderate earthward flows were observed amidst azimuthally drifting interchange heads and concurrently with the ionospheric current intensifications near Time History of Events and Macroscale Interactions during Substorms footprints and auroral bright spots originating from dimmer azimuthal beads/rays. These events support the idea that some of the BICI heads detach from the region with reversed radial gradient of BZ due to local reconnection. The detached BICI heads propagate earthward‐driving ionospheric pseudo‐breakups.
Plain Language Summary
The Earth's magnetotail periodically accumulates energy in form of the magnetic flux in the tail lobes and dumps the energy as fast earthward and tailward plasma flows, which are produced by magnetic reconnection. Yet there is no consensus on what magnetotail processes may lead to reconnection. Examples of multiprobe space observations are used to reveal the possible process that might be important for azimuthally localized reconnection in the tail that leads to pseudo‐breakups in aurora and local ionospheric current systems. The examples show the appearance of earthward‐propagating reconnection (dipolarization) fronts amidst azimuthally propagating clumps of more dipolar field lines that were produced by an instability which was predicted to lead to localized reconnection by earlier plasma computer simulations. The conjugate ground auroral and magnetic field observations support the reconnection fronts' origin hypothesis.
Key Points
Azimuthally drifting interchange heads in the near‐Earth plasma sheet may detach and propagate earthward
Detached interchange heads are seen as localized dipolarization fronts amidst azimuthally drifting interchange heads
The detachments cause ionospheric pseudo‐breakups with local current system and auroral bright spots originating from azimuthal beads/rays</description><subject>auroral substorms</subject><subject>Auroras</subject><subject>ballooning/interchange instability</subject><subject>Beads</subject><subject>Bright spots</subject><subject>Clumps</subject><subject>Computer simulation</subject><subject>Conjugates</subject><subject>Detaching</subject><subject>dipolarization front</subject><subject>Earth</subject><subject>Footprints</subject><subject>Fronts</subject><subject>Instability</subject><subject>ionosphere</subject><subject>Ionospheric currents</subject><subject>Ionospheric propagation</subject><subject>Magnetic field</subject><subject>Magnetic fields</subject><subject>Magnetic flux</subject><subject>Magnetic reconnection</subject><subject>Magnetometers</subject><subject>Magnetotails</subject><subject>Mathematical models</subject><subject>Plasma</subject><subject>pseudo‐breakup</subject><subject>reconnection</subject><subject>Stability</subject><subject>Tubes</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp9kEtPwzAQhC0EEuVx4wdE4kpgvU5i5wYq9CEFISE4R1vHblOVuNiuUP89RuXAidPO4dPM7DB2xeGWA9Z3CLyeNqAESDhiI14XRa4A5DEbAdRJo6xO2VkIawAQIPiI3c_d4MJ2ZXyvs4lzcev7IYbM2ezRRNIr02XPtBxMdJH6TTYfovF6RcPSZDNDXbhgJ5Y2wVz-3nP2Pnl6G8_y5mU6Hz80uS5St5xAlKaQpEgIqa0qCSsJVllZLQTZSgjsAEiiLnmHurK6VByhM0qVC0tcnLPrg-_Wu8-dCbFdu50fUmSLWGHKKAATdXOgtHcheGPb9M8H-X3Lof3ZqP27UcLxgH_1G7P_l22nr01Zc4HiG76RZmA</recordid><startdate>20190716</startdate><enddate>20190716</enddate><creator>Panov, E. V.</creator><creator>Baumjohann, W.</creator><creator>Nakamura, R.</creator><creator>Pritchett, P. L.</creator><creator>Weygand, J. M.</creator><creator>Kubyshkina, M. V.</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><orcidid>https://orcid.org/0000-0002-2620-9211</orcidid><orcidid>https://orcid.org/0000-0003-3609-235X</orcidid><orcidid>https://orcid.org/0000-0001-6271-0110</orcidid><orcidid>https://orcid.org/0000-0003-2085-1171</orcidid><orcidid>https://orcid.org/0000-0001-5897-9547</orcidid><orcidid>https://orcid.org/0000-0001-7996-2277</orcidid></search><sort><creationdate>20190716</creationdate><title>Ionospheric Footprints of Detached Magnetotail Interchange Heads</title><author>Panov, E. V. ; Baumjohann, W. ; Nakamura, R. ; Pritchett, P. L. ; Weygand, J. M. ; Kubyshkina, M. V.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4102-a035e47a8a337cf85a2670f8f76b3af6332d00a72c51d2c6fc58120de885bfa13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>auroral substorms</topic><topic>Auroras</topic><topic>ballooning/interchange instability</topic><topic>Beads</topic><topic>Bright spots</topic><topic>Clumps</topic><topic>Computer simulation</topic><topic>Conjugates</topic><topic>Detaching</topic><topic>dipolarization front</topic><topic>Earth</topic><topic>Footprints</topic><topic>Fronts</topic><topic>Instability</topic><topic>ionosphere</topic><topic>Ionospheric currents</topic><topic>Ionospheric propagation</topic><topic>Magnetic field</topic><topic>Magnetic fields</topic><topic>Magnetic flux</topic><topic>Magnetic reconnection</topic><topic>Magnetometers</topic><topic>Magnetotails</topic><topic>Mathematical models</topic><topic>Plasma</topic><topic>pseudo‐breakup</topic><topic>reconnection</topic><topic>Stability</topic><topic>Tubes</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Panov, E. V.</creatorcontrib><creatorcontrib>Baumjohann, W.</creatorcontrib><creatorcontrib>Nakamura, R.</creatorcontrib><creatorcontrib>Pritchett, P. L.</creatorcontrib><creatorcontrib>Weygand, J. M.</creatorcontrib><creatorcontrib>Kubyshkina, M. V.</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><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Panov, E. V.</au><au>Baumjohann, W.</au><au>Nakamura, R.</au><au>Pritchett, P. L.</au><au>Weygand, J. M.</au><au>Kubyshkina, M. V.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ionospheric Footprints of Detached Magnetotail Interchange Heads</atitle><jtitle>Geophysical research letters</jtitle><date>2019-07-16</date><risdate>2019</risdate><volume>46</volume><issue>13</issue><spage>7237</spage><epage>7247</epage><pages>7237-7247</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>Pritchett and Coroniti (2011, https://doi.org/10.1029/2011GL047527, 2013, https://doi.org/10.1029/2012JA018143) have predicted that the kinetic ballooning/interchange instability (BICI) can provoke reconnection onsets that lead to detached azimuthally thin earthward intrusions (heads) of depleted plasma tubes when
βeq⩽ 100. Such detached BICI heads would be seen as localized earthward‐propagating dipolarization fronts. Using Time History of Events and Macroscale Interactions during Substorms observations in the plasma sheet at XGSM≈−11RE and conjugate All‐Sky Imager and magnetometer networks observations on the ground, we show four examples when prominent dipolarization fronts with moderate earthward flows were observed amidst azimuthally drifting interchange heads and concurrently with the ionospheric current intensifications near Time History of Events and Macroscale Interactions during Substorms footprints and auroral bright spots originating from dimmer azimuthal beads/rays. These events support the idea that some of the BICI heads detach from the region with reversed radial gradient of BZ due to local reconnection. The detached BICI heads propagate earthward‐driving ionospheric pseudo‐breakups.
Plain Language Summary
The Earth's magnetotail periodically accumulates energy in form of the magnetic flux in the tail lobes and dumps the energy as fast earthward and tailward plasma flows, which are produced by magnetic reconnection. Yet there is no consensus on what magnetotail processes may lead to reconnection. Examples of multiprobe space observations are used to reveal the possible process that might be important for azimuthally localized reconnection in the tail that leads to pseudo‐breakups in aurora and local ionospheric current systems. The examples show the appearance of earthward‐propagating reconnection (dipolarization) fronts amidst azimuthally propagating clumps of more dipolar field lines that were produced by an instability which was predicted to lead to localized reconnection by earlier plasma computer simulations. The conjugate ground auroral and magnetic field observations support the reconnection fronts' origin hypothesis.
Key Points
Azimuthally drifting interchange heads in the near‐Earth plasma sheet may detach and propagate earthward
Detached interchange heads are seen as localized dipolarization fronts amidst azimuthally drifting interchange heads
The detachments cause ionospheric pseudo‐breakups with local current system and auroral bright spots originating from azimuthal beads/rays</abstract><cop>Washington</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1029/2019GL083070</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0002-2620-9211</orcidid><orcidid>https://orcid.org/0000-0003-3609-235X</orcidid><orcidid>https://orcid.org/0000-0001-6271-0110</orcidid><orcidid>https://orcid.org/0000-0003-2085-1171</orcidid><orcidid>https://orcid.org/0000-0001-5897-9547</orcidid><orcidid>https://orcid.org/0000-0001-7996-2277</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | auroral substorms Auroras ballooning/interchange instability Beads Bright spots Clumps Computer simulation Conjugates Detaching dipolarization front Earth Footprints Fronts Instability ionosphere Ionospheric currents Ionospheric propagation Magnetic field Magnetic fields Magnetic flux Magnetic reconnection Magnetometers Magnetotails Mathematical models Plasma pseudo‐breakup reconnection Stability Tubes |
| title | Ionospheric Footprints of Detached Magnetotail Interchange Heads |
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