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The Occurrence and Prevalence of Magnetic Reconnection in the Kelvin‐Helmholtz Instability Under Various Solar Wind Conditions.

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Title: The Occurrence and Prevalence of Magnetic Reconnection in the Kelvin‐Helmholtz Instability Under Various Solar Wind Conditions.
Authors: Wilder, F. D.1 (AUTHOR) rederick.wilder@uta.edu, King, A.1 (AUTHOR), Gove, D.2 (AUTHOR), Eriksson, S.2 (AUTHOR), Ahmadi, N.2 (AUTHOR), Workman, T. L.1 (AUTHOR), Ergun, R. E.2 (AUTHOR), Burch, J. L.3 (AUTHOR), Torbert, R. B.4 (AUTHOR), Giles, B. L.5 (AUTHOR), Strangeway, R. J.6 (AUTHOR)
Source: Journal of Geophysical Research. Space Physics. Oct2023, Vol. 128 Issue 10, p1-11. 11p.
Subject Terms: Kelvin-Helmholtz instability, Magnetic reconnection, Solar wind, Interplanetary magnetic fields, Current sheets, Magnetic flux density
Company/Entity: United States. National Aeronautics & Space Administration
People: Helmholtz, Hermann von, 1821-1894
Abstract: As the shocked solar wind flows past the flank magnetopause, surface waves can form and roll up into flow vortices. This is known as the Kelvin–Helmholtz Instability, which is thought to be an important mechanism whereby energy and momentum are transferred from the solar wind into the magnetosphere. One mechanism whereby this can occur is magnetic reconnection in the equatorial plane on compressed current sheets between vortices. In 2015, the NASA Magnetospheric Multiscale (MMS) mission observed this form of in‐plane reconnection during a KHI event in the post‐noon sector of the dayside magnetopause. We use data from MMS to investigate 12 KHI events at different positions along the magnetospheric flanks. For each event, we identify periodic compressed current sheets and perform Walén tests for each to identify reconnection jets. We then investigate the fraction of current sheets that exhibit reconnection signatures, and refer to it as the "event ratio." Results show that the event ratio decreases for events further down the magnetospheric flanks. Additionally, we investigate solar wind parameters during each event and find that the event ratio increases with an increasing northward component of the interplanetary magnetic field. Key Points: 12 Kelvin‐Helmholtz events observed by MMS are investigatedWe determine the fraction of current sheets where magnetic reconnection occursThe fraction of currents sheets with reconnection signatures correlates with northward interplanetary magnetic field strength [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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Header DbId: 8gh
DbLabel: GreenFILE
An: 173281992
AccessLevel: 6
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PubTypeId: academicJournal
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  Data: The Occurrence and Prevalence of Magnetic Reconnection in the Kelvin‐Helmholtz Instability Under Various Solar Wind Conditions.
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  Data: <searchLink fieldCode="AR" term="%22Wilder%2C+F%2E+D%2E%22">Wilder, F. D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rederick.wilder@uta.edu</i><br /><searchLink fieldCode="AR" term="%22King%2C+A%2E%22">King, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gove%2C+D%2E%22">Gove, D.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Eriksson%2C+S%2E%22">Eriksson, S.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ahmadi%2C+N%2E%22">Ahmadi, N.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Workman%2C+T%2E+L%2E%22">Workman, T. L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ergun%2C+R%2E+E%2E%22">Ergun, R. E.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Burch%2C+J%2E+L%2E%22">Burch, J. L.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Torbert%2C+R%2E+B%2E%22">Torbert, R. B.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Giles%2C+B%2E+L%2E%22">Giles, B. L.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Strangeway%2C+R%2E+J%2E%22">Strangeway, R. J.</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: As the shocked solar wind flows past the flank magnetopause, surface waves can form and roll up into flow vortices. This is known as the Kelvin–Helmholtz Instability, which is thought to be an important mechanism whereby energy and momentum are transferred from the solar wind into the magnetosphere. One mechanism whereby this can occur is magnetic reconnection in the equatorial plane on compressed current sheets between vortices. In 2015, the NASA Magnetospheric Multiscale (MMS) mission observed this form of in‐plane reconnection during a KHI event in the post‐noon sector of the dayside magnetopause. We use data from MMS to investigate 12 KHI events at different positions along the magnetospheric flanks. For each event, we identify periodic compressed current sheets and perform Walén tests for each to identify reconnection jets. We then investigate the fraction of current sheets that exhibit reconnection signatures, and refer to it as the "event ratio." Results show that the event ratio decreases for events further down the magnetospheric flanks. Additionally, we investigate solar wind parameters during each event and find that the event ratio increases with an increasing northward component of the interplanetary magnetic field. Key Points: 12 Kelvin‐Helmholtz events observed by MMS are investigatedWe determine the fraction of current sheets where magnetic reconnection occursThe fraction of currents sheets with reconnection signatures correlates with northward interplanetary magnetic field strength [ABSTRACT FROM AUTHOR]
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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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      – Type: doi
        Value: 10.1029/2023JA031583
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      – Code: eng
        Text: English
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        PageCount: 11
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    Subjects:
      – SubjectFull: Kelvin-Helmholtz instability
        Type: general
      – SubjectFull: Magnetic reconnection
        Type: general
      – SubjectFull: Solar wind
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      – SubjectFull: Interplanetary magnetic fields
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      – SubjectFull: Current sheets
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      – SubjectFull: Magnetic flux density
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      – SubjectFull: United States. National Aeronautics & Space Administration
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      – SubjectFull: Helmholtz, Hermann von, 1821-1894
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      – TitleFull: The Occurrence and Prevalence of Magnetic Reconnection in the Kelvin‐Helmholtz Instability Under Various Solar Wind Conditions.
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              Text: Oct2023
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