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Multi‐Scale Observation of Magnetotail Reconnection Onset: 2. Microscopic Dynamics.

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Title: Multi‐Scale Observation of Magnetotail Reconnection Onset: 2. Microscopic Dynamics.
Authors: Genestreti, Kevin J.1 (AUTHOR) kevin.genestreti@swri.org, Farrugia, Charles J.2 (AUTHOR), Lu, San3,4 (AUTHOR), Vines, Sarah K.5 (AUTHOR), Reiff, Patricia H.6 (AUTHOR), Phan, Tai7 (AUTHOR), Baker, Daniel N.8 (AUTHOR), Leonard, Trevor W.8,9,10 (AUTHOR), Burch, James L.11 (AUTHOR), Bingham, Samuel T.5 (AUTHOR), Cohen, Ian J.5 (AUTHOR), Shuster, Jason R.12,13 (AUTHOR), Gershman, Daniel J.12 (AUTHOR), Mouikis, Christopher G.2 (AUTHOR), Rogers, Anthony J.2 (AUTHOR), Torbert, Roy B.1,2 (AUTHOR), Trattner, Karlheinz J.8 (AUTHOR), Webster, James M.6,11 (AUTHOR), Chen, Li‐Jen12 (AUTHOR), Giles, Barbara L.12 (AUTHOR)
Source: Journal of Geophysical Research. Space Physics. Nov2023, Vol. 128 Issue 11, p1-10. 10p.
Subject Terms: Current sheets, Magnetic reconnection, Wind pressure, Electric fields, Magnetic fields, Solar wind, Latitude, Mouth protectors
Abstract: We analyze the local dynamics of magnetotail reconnection onset using Magnetospheric Multiscale (MMS) data. In conjunction with MMS, the macroscopic dynamics of this event were captured by a number of other ground and space‐based observatories, as is reported in a companion paper. We find that the local dynamics of the onset were characterized by the rapid thinning of the cross‐tail current sheet below the ion inertial scale, accompanied by the growth of flapping waves and the subsequent onset of electron tearing. Multiple kinetic‐scale magnetic islands were detected coincident with the growth of an initially sub‐Alfvénic, demagnetized tailward ion exhaust. The onset and rapid enhancement of parallel electron inflow at the exhaust boundary was a remote signature of the intensification of reconnection Earthward of the spacecraft. Two secondary reconnection sites are found embedded within the exhaust from a primary X‐line. The primary X‐line was designated as such on the basis that (a) while multiple jet reversals were observed in the current sheet, only one reversal of the electron inflow was observed at the high‐latitude exhaust boundary, (b) the reconnection electric field was roughly five times larger at the primary X‐line than the secondary X‐lines, and (c) energetic electron fluxes increased and transitioned from anti‐field‐aligned to isotropic during the primary X‐line crossing, indicating a change in magnetic topology. The results are consistent with the idea that a primary X‐line mediates the reconnection of lobe magnetic field lines and accelerates electrons more efficiently than its secondary X‐line counterparts. Key Points: Magnetotail reconnection onset was triggered by electron tearing during a solar wind pressure pulseOnset was characterized by the rapid collapse of the current sheet thickness and kinetic‐scale flux rope formationA primary X‐line was established within minutes of the onset [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Multi‐Scale Observation of Magnetotail Reconnection Onset: 2. Microscopic Dynamics.
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  Data: <searchLink fieldCode="AR" term="%22Genestreti%2C+Kevin+J%2E%22">Genestreti, Kevin J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> kevin.genestreti@swri.org</i><br /><searchLink fieldCode="AR" term="%22Farrugia%2C+Charles+J%2E%22">Farrugia, Charles J.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lu%2C+San%22">Lu, San</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vines%2C+Sarah+K%2E%22">Vines, Sarah K.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Reiff%2C+Patricia+H%2E%22">Reiff, Patricia H.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Phan%2C+Tai%22">Phan, Tai</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Baker%2C+Daniel+N%2E%22">Baker, Daniel N.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Leonard%2C+Trevor+W%2E%22">Leonard, Trevor W.</searchLink><relatesTo>8,9,10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Burch%2C+James+L%2E%22">Burch, James L.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bingham%2C+Samuel+T%2E%22">Bingham, Samuel T.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cohen%2C+Ian+J%2E%22">Cohen, Ian J.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shuster%2C+Jason+R%2E%22">Shuster, Jason R.</searchLink><relatesTo>12,13</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gershman%2C+Daniel+J%2E%22">Gershman, Daniel J.</searchLink><relatesTo>12</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mouikis%2C+Christopher+G%2E%22">Mouikis, Christopher G.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rogers%2C+Anthony+J%2E%22">Rogers, Anthony J.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Torbert%2C+Roy+B%2E%22">Torbert, Roy B.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Trattner%2C+Karlheinz+J%2E%22">Trattner, Karlheinz J.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Webster%2C+James+M%2E%22">Webster, James M.</searchLink><relatesTo>6,11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Li‐Jen%22">Chen, Li‐Jen</searchLink><relatesTo>12</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Giles%2C+Barbara+L%2E%22">Giles, Barbara L.</searchLink><relatesTo>12</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Nov2023, Vol. 128 Issue 11, p1-10. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Current+sheets%22">Current sheets</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+reconnection%22">Magnetic reconnection</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+pressure%22">Wind pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+fields%22">Electric fields</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+wind%22">Solar wind</searchLink><br /><searchLink fieldCode="DE" term="%22Latitude%22">Latitude</searchLink><br /><searchLink fieldCode="DE" term="%22Mouth+protectors%22">Mouth protectors</searchLink>
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  Label: Abstract
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  Data: We analyze the local dynamics of magnetotail reconnection onset using Magnetospheric Multiscale (MMS) data. In conjunction with MMS, the macroscopic dynamics of this event were captured by a number of other ground and space‐based observatories, as is reported in a companion paper. We find that the local dynamics of the onset were characterized by the rapid thinning of the cross‐tail current sheet below the ion inertial scale, accompanied by the growth of flapping waves and the subsequent onset of electron tearing. Multiple kinetic‐scale magnetic islands were detected coincident with the growth of an initially sub‐Alfvénic, demagnetized tailward ion exhaust. The onset and rapid enhancement of parallel electron inflow at the exhaust boundary was a remote signature of the intensification of reconnection Earthward of the spacecraft. Two secondary reconnection sites are found embedded within the exhaust from a primary X‐line. The primary X‐line was designated as such on the basis that (a) while multiple jet reversals were observed in the current sheet, only one reversal of the electron inflow was observed at the high‐latitude exhaust boundary, (b) the reconnection electric field was roughly five times larger at the primary X‐line than the secondary X‐lines, and (c) energetic electron fluxes increased and transitioned from anti‐field‐aligned to isotropic during the primary X‐line crossing, indicating a change in magnetic topology. The results are consistent with the idea that a primary X‐line mediates the reconnection of lobe magnetic field lines and accelerates electrons more efficiently than its secondary X‐line counterparts. Key Points: Magnetotail reconnection onset was triggered by electron tearing during a solar wind pressure pulseOnset was characterized by the rapid collapse of the current sheet thickness and kinetic‐scale flux rope formationA primary X‐line was established within minutes of the onset [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1029/2023JA031760
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        Text: English
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        PageCount: 10
        StartPage: 1
    Subjects:
      – SubjectFull: Current sheets
        Type: general
      – SubjectFull: Magnetic reconnection
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      – SubjectFull: Wind pressure
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      – SubjectFull: Latitude
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      – SubjectFull: Mouth protectors
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      – TitleFull: Multi‐Scale Observation of Magnetotail Reconnection Onset: 2. Microscopic Dynamics.
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