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Magnetic Fields and Plasma Motions in a Hybrid Martian Magnetosphere.

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Title: Magnetic Fields and Plasma Motions in a Hybrid Martian Magnetosphere.
Authors: Dubinin, E.1 (AUTHOR) dubinin@mps.mpg.de, Fraenz, M.1 (AUTHOR), Pätzold, M.2 (AUTHOR), Tellmann, S.2 (AUTHOR), Modolo, R.3 (AUTHOR), DiBraccio, G.4 (AUTHOR), McFadden, J.5 (AUTHOR), Espley, J.4 (AUTHOR)
Source: Journal of Geophysical Research. Space Physics. Jan2023, Vol. 128 Issue 1, p1-16. 16p.
Subject Terms: Interplanetary magnetic fields, Magnetosphere, Magnetic fields, Solar wind, Magnetic dipoles, Magnetic flux
Reviews & Products: Martian, The (Book : Weir)
Abstract: The Martian magnetosphere contains elements of induced and intrinsic origin. To display them one must use different coordinate systems. Although the solar‐electric coordinate system (Mars Solar Electric [MSE]) adequately describes the main features of the induced magnetosphere, it removes/suppresses aspects caused by the crustal magnetic sources while rotating the spacecraft position to the MSE‐coordinate system and averaging over many orbits. On the other hand, to observe effects of the crustal field one should use the solar orbital coordinates (Mars Solar Orbital [MSO]). To find a compromise and keeping in mind that the most probable value of the clock angle of the interplanetary magnetic field (IMF) on the Mars orbit is ∼90° we can consider separately cases with positive and negative By components of the IMF. It is shown that dynamics of ion fluxes in the distant regions of the magnetosphere is mainly controlled by induced features. However, reconnection of the draping IMF with crustal field leads to a twisting of the classical draping configuration. Despite of the very intricate local geometry of the crustal field, the low‐order harmonics of the magnetic field and mainly the dipole component determine the reconnection sites, at least, statistically for many Mars rotations. For different signs of the By component of the IMF these sites occur either in the +Y‐MSO or −Y‐MSO hemispheres. As a result, statistically the magnetosphere of Mars looks like a hybrid magnetosphere formed during the solar wind interaction with the obstacle which simultaneously contains an extended ionosphere and a weak dipole magnetic field. Key Points: The Martian magnetosphere contains elements of induced and intrinsic originDynamics of ion fluxes in the magnetic tail, is mainly controlled by induced featuresReconnection of the interplanetary magnetic field with low‐order harmonics of the crustal field leads to twisting of the tail and formation of hybrid magnetosphere [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: Magnetic Fields and Plasma Motions in a Hybrid Martian Magnetosphere.
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  Data: <searchLink fieldCode="AR" term="%22Dubinin%2C+E%2E%22">Dubinin, E.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dubinin@mps.mpg.de</i><br /><searchLink fieldCode="AR" term="%22Fraenz%2C+M%2E%22">Fraenz, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pätzold%2C+M%2E%22">Pätzold, M.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tellmann%2C+S%2E%22">Tellmann, S.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Modolo%2C+R%2E%22">Modolo, R.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22DiBraccio%2C+G%2E%22">DiBraccio, G.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22McFadden%2C+J%2E%22">McFadden, J.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Espley%2C+J%2E%22">Espley, J.</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: The Martian magnetosphere contains elements of induced and intrinsic origin. To display them one must use different coordinate systems. Although the solar‐electric coordinate system (Mars Solar Electric [MSE]) adequately describes the main features of the induced magnetosphere, it removes/suppresses aspects caused by the crustal magnetic sources while rotating the spacecraft position to the MSE‐coordinate system and averaging over many orbits. On the other hand, to observe effects of the crustal field one should use the solar orbital coordinates (Mars Solar Orbital [MSO]). To find a compromise and keeping in mind that the most probable value of the clock angle of the interplanetary magnetic field (IMF) on the Mars orbit is ∼90° we can consider separately cases with positive and negative By components of the IMF. It is shown that dynamics of ion fluxes in the distant regions of the magnetosphere is mainly controlled by induced features. However, reconnection of the draping IMF with crustal field leads to a twisting of the classical draping configuration. Despite of the very intricate local geometry of the crustal field, the low‐order harmonics of the magnetic field and mainly the dipole component determine the reconnection sites, at least, statistically for many Mars rotations. For different signs of the By component of the IMF these sites occur either in the +Y‐MSO or −Y‐MSO hemispheres. As a result, statistically the magnetosphere of Mars looks like a hybrid magnetosphere formed during the solar wind interaction with the obstacle which simultaneously contains an extended ionosphere and a weak dipole magnetic field. Key Points: The Martian magnetosphere contains elements of induced and intrinsic originDynamics of ion fluxes in the magnetic tail, is mainly controlled by induced featuresReconnection of the interplanetary magnetic field with low‐order harmonics of the crustal field leads to twisting of the tail and formation of hybrid magnetosphere [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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        Value: 10.1029/2022JA030575
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        Text: English
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        PageCount: 16
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    Subjects:
      – SubjectFull: Interplanetary magnetic fields
        Type: general
      – SubjectFull: Magnetosphere
        Type: general
      – SubjectFull: Magnetic fields
        Type: general
      – SubjectFull: Solar wind
        Type: general
      – SubjectFull: Magnetic dipoles
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      – SubjectFull: Magnetic flux
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      – SubjectFull: Martian, The (Book : Weir)
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              Text: Jan2023
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