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Two Classes of Equatorial Magnetotail Dipolarization Fronts Observed by Magnetospheric Multiscale Mission: A Statistical Overview.

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Title: Two Classes of Equatorial Magnetotail Dipolarization Fronts Observed by Magnetospheric Multiscale Mission: A Statistical Overview.
Authors: Alqeeq, S. W.1 (AUTHOR) soboh.alqeeq@lpp.polytechnique.fr, Le Contel, O.1 (AUTHOR), Canu, P.1 (AUTHOR), Retinò, A.1 (AUTHOR), Chust, T.1 (AUTHOR), Mirioni, L.1 (AUTHOR), Chuvatin, A.1 (AUTHOR), Nakamura, R.2 (AUTHOR), Ahmadi, N.3 (AUTHOR), Wilder, F. D.4 (AUTHOR), Gershman, D. J.5 (AUTHOR), Khotyaintsev, Yu. V.6 (AUTHOR), Lindqvist, P.‐A.7 (AUTHOR), Ergun, R. E.3 (AUTHOR), Burch, J. L.8,9 (AUTHOR), Torbert, R. B.10 (AUTHOR), Fuselier, S. A.8,9 (AUTHOR), Russell, C. T.11 (AUTHOR), Wei, H. Y.11 (AUTHOR), Strangeway, R. J.11 (AUTHOR)
Source: Journal of Geophysical Research. Space Physics. Oct2023, Vol. 128 Issue 10, p1-20. 20p.
Subject Terms: *Energy conversion, Electric fields, Magnetic fields, Electrons
Abstract: We carried out a statistical study of equatorial dipolarization fronts (DFs) detected by the Magnetospheric Multiscale mission during the full 2017 Earth's magnetotail season. We found that two DF classes are distinguished: class I (74.4%) corresponds to the standard DF properties and energy dissipation and a new class II (25.6%). This new class includes the six DF discussed in Alqeeq et al. (2022, https://doi.org/10.1063/5.0069432) and corresponds to a bump of the magnetic field associated with a minimum in the ion and electron pressures and a reversal of the energy conversion process. The possible origin of this second class is discussed. Both DF classes show that the energy conversion process in the spacecraft frame is driven by the diamagnetic current dominated by the ion pressure gradient. In the fluid frame, it is driven by the electron pressure gradient. In addition, we have shown that the energy conversion processes are not homogeneous at the electron scale mostly due to the variations of the electric fields for both DF classes. Key Points: We reveal a new class of dipolarization front related to a bump of the magnetic field associated with a minimum in the ion and electron pressuresThe energy conversion process in the S/C frame is driven by the diamagnetic current dominated by the ion pressure gradientThe energy conversion processes are not homogeneous at the electron scale due to the variations of the electric fields [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: Two Classes of Equatorial Magnetotail Dipolarization Fronts Observed by Magnetospheric Multiscale Mission: A Statistical Overview.
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  Data: <searchLink fieldCode="AR" term="%22Alqeeq%2C+S%2E+W%2E%22">Alqeeq, S. W.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> soboh.alqeeq@lpp.polytechnique.fr</i><br /><searchLink fieldCode="AR" term="%22Le+Contel%2C+O%2E%22">Le Contel, O.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Canu%2C+P%2E%22">Canu, P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Retinò%2C+A%2E%22">Retinò, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chust%2C+T%2E%22">Chust, T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mirioni%2C+L%2E%22">Mirioni, L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chuvatin%2C+A%2E%22">Chuvatin, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nakamura%2C+R%2E%22">Nakamura, R.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ahmadi%2C+N%2E%22">Ahmadi, N.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wilder%2C+F%2E+D%2E%22">Wilder, F. D.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gershman%2C+D%2E+J%2E%22">Gershman, D. J.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khotyaintsev%2C+Yu%2E+V%2E%22">Khotyaintsev, Yu. V.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lindqvist%2C+P%2E‐A%2E%22">Lindqvist, P.‐A.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ergun%2C+R%2E+E%2E%22">Ergun, R. E.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Burch%2C+J%2E+L%2E%22">Burch, J. L.</searchLink><relatesTo>8,9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Torbert%2C+R%2E+B%2E%22">Torbert, R. B.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fuselier%2C+S%2E+A%2E%22">Fuselier, S. A.</searchLink><relatesTo>8,9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Russell%2C+C%2E+T%2E%22">Russell, C. T.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wei%2C+H%2E+Y%2E%22">Wei, H. Y.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Strangeway%2C+R%2E+J%2E%22">Strangeway, R. J.</searchLink><relatesTo>11</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>. Oct2023, Vol. 128 Issue 10, p1-20. 20p.
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  Data: *<searchLink fieldCode="DE" term="%22Energy+conversion%22">Energy conversion</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="%22Electrons%22">Electrons</searchLink>
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  Data: We carried out a statistical study of equatorial dipolarization fronts (DFs) detected by the Magnetospheric Multiscale mission during the full 2017 Earth's magnetotail season. We found that two DF classes are distinguished: class I (74.4%) corresponds to the standard DF properties and energy dissipation and a new class II (25.6%). This new class includes the six DF discussed in Alqeeq et al. (2022, https://doi.org/10.1063/5.0069432) and corresponds to a bump of the magnetic field associated with a minimum in the ion and electron pressures and a reversal of the energy conversion process. The possible origin of this second class is discussed. Both DF classes show that the energy conversion process in the spacecraft frame is driven by the diamagnetic current dominated by the ion pressure gradient. In the fluid frame, it is driven by the electron pressure gradient. In addition, we have shown that the energy conversion processes are not homogeneous at the electron scale mostly due to the variations of the electric fields for both DF classes. Key Points: We reveal a new class of dipolarization front related to a bump of the magnetic field associated with a minimum in the ion and electron pressuresThe energy conversion process in the S/C frame is driven by the diamagnetic current dominated by the ion pressure gradientThe energy conversion processes are not homogeneous at the electron scale due to the variations of the electric fields [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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