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Plasma Dynamics and Structure of Titan's Induced Magnetosphere From Wave, Magnetic Field, and Plasma Measurements.

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Title: Plasma Dynamics and Structure of Titan's Induced Magnetosphere From Wave, Magnetic Field, and Plasma Measurements.
Authors: Kim, K.1,2 (AUTHOR) konstantin.kim@irfu.se, Modolo, R.3 (AUTHOR), Edberg, N. J. T.1 (AUTHOR), Morooka, M.1 (AUTHOR), Romanelli, N.4,5 (AUTHOR), Moissard, C.6 (AUTHOR), Holmberg, M. K. G.7 (AUTHOR), Bertucci, C.8 (AUTHOR), Berthelier, J.‐J.3 (AUTHOR), Canu, P.9 (AUTHOR), Piberne, R.9 (AUTHOR), Coates, A. J.10 (AUTHOR), Dubinin, E.11 (AUTHOR), Regoli, L.12 (AUTHOR), Kurth, W. S.13 (AUTHOR), Wahlund, J.‐E.1 (AUTHOR), Waite, J. H.14 (AUTHOR), Dougherty, M. K.15 (AUTHOR)
Source: Journal of Geophysical Research. Space Physics. Apr2026, Vol. 131 Issue 4, p1-16. 16p.
Subject Terms: Magnetosphere, Atmospheric ionization, Magnetic field measurements, Electric fields, Fast ions, Electron density
Company/Entity: Cassini (Spacecraft)
Abstract: In this study, we combine Cassini fields and particle observations to investigate Titan's induced magnetosphere from the TA to T82 flybys, including flybys from the Cassini prime, equinox, and part of the solstice mission, to investigate the average location and the shape of Titan's induced magnetosphere. Although earlier studies have provided valuable information on Titan's induced magnetosphere, they were largely based on separate analyses of fields and particle data. We provide an integrated map of electron density and temperature in Titan's near plasma environment to outline the external boundary of the induced magnetosphere. We identify a dense ionospheric region and an extended plasma wake with electron densities ranging between 10−2 $1{0}^{-2}$ and 103 $1{0}^{3}$ cm−3 ${\mathrm{m}}^{-3}$. In addition, we systematize the spatial distribution of pick‐up ions at Titan with respect to the background convective electric field. We indicate that pickup ions are found in the positive hemisphere of the Kronian plasma convective electric field. The mass of the observed pickup corresponds to methane group ions, N2+ ${\mathrm{N}}_{2}^{+}$ ions as well as protons and molecular hydrogen ions. The Kronian background electric field progressively accelerates these ions, and we estimate its intensity by reconstructing the radial energy gain of this population in response to the convective electric field. We find the estimated from the pickup ions electric field values within 0.05 mV m−1 ${\mathrm{m}}^{-1}$ and 1.92 mV m−1 ${\mathrm{m}}^{-1}$ range, which is consistent with an estimate of 0.61 mV m−1 ${\mathrm{m}}^{-1}$ deduced from |−vcorot×B| $\vert -{\mathbf{v}}_{\mathit{corot}}\times \mathbf{B}\vert $ computation. Key Points: We analyze Titan's induced magnetosphere, making use of Cassini RPWS, CAPS, and MAG measurements from 82 flybysWe derive the first global electron density map of Titan's near environment and delimit an average induced magnetosphere shapeWe identified pickup ions with energies between 10 eV and 3 keV, increasing along the 0.7 mV m−1 ${\mathrm{m}}^{-1}$ convective electric field [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: Plasma Dynamics and Structure of Titan's Induced Magnetosphere From Wave, Magnetic Field, and Plasma Measurements.
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  Data: <searchLink fieldCode="AR" term="%22Kim%2C+K%2E%22">Kim, K.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> konstantin.kim@irfu.se</i><br /><searchLink fieldCode="AR" term="%22Modolo%2C+R%2E%22">Modolo, R.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Edberg%2C+N%2E+J%2E+T%2E%22">Edberg, N. J. T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Morooka%2C+M%2E%22">Morooka, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Romanelli%2C+N%2E%22">Romanelli, N.</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Moissard%2C+C%2E%22">Moissard, C.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Holmberg%2C+M%2E+K%2E+G%2E%22">Holmberg, M. K. G.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bertucci%2C+C%2E%22">Bertucci, C.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Berthelier%2C+J%2E‐J%2E%22">Berthelier, J.‐J.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Canu%2C+P%2E%22">Canu, P.</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Piberne%2C+R%2E%22">Piberne, R.</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Coates%2C+A%2E+J%2E%22">Coates, A. J.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dubinin%2C+E%2E%22">Dubinin, E.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Regoli%2C+L%2E%22">Regoli, L.</searchLink><relatesTo>12</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kurth%2C+W%2E+S%2E%22">Kurth, W. S.</searchLink><relatesTo>13</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wahlund%2C+J%2E‐E%2E%22">Wahlund, J.‐E.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Waite%2C+J%2E+H%2E%22">Waite, J. H.</searchLink><relatesTo>14</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dougherty%2C+M%2E+K%2E%22">Dougherty, M. K.</searchLink><relatesTo>15</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>. Apr2026, Vol. 131 Issue 4, p1-16. 16p.
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  Data: In this study, we combine Cassini fields and particle observations to investigate Titan's induced magnetosphere from the TA to T82 flybys, including flybys from the Cassini prime, equinox, and part of the solstice mission, to investigate the average location and the shape of Titan's induced magnetosphere. Although earlier studies have provided valuable information on Titan's induced magnetosphere, they were largely based on separate analyses of fields and particle data. We provide an integrated map of electron density and temperature in Titan's near plasma environment to outline the external boundary of the induced magnetosphere. We identify a dense ionospheric region and an extended plasma wake with electron densities ranging between 10−2 $1{0}^{-2}$ and 103 $1{0}^{3}$ cm−3 ${\mathrm{m}}^{-3}$. In addition, we systematize the spatial distribution of pick‐up ions at Titan with respect to the background convective electric field. We indicate that pickup ions are found in the positive hemisphere of the Kronian plasma convective electric field. The mass of the observed pickup corresponds to methane group ions, N2+ ${\mathrm{N}}_{2}^{+}$ ions as well as protons and molecular hydrogen ions. The Kronian background electric field progressively accelerates these ions, and we estimate its intensity by reconstructing the radial energy gain of this population in response to the convective electric field. We find the estimated from the pickup ions electric field values within 0.05 mV m−1 ${\mathrm{m}}^{-1}$ and 1.92 mV m−1 ${\mathrm{m}}^{-1}$ range, which is consistent with an estimate of 0.61 mV m−1 ${\mathrm{m}}^{-1}$ deduced from |−vcorot×B| $\vert -{\mathbf{v}}_{\mathit{corot}}\times \mathbf{B}\vert $ computation. Key Points: We analyze Titan's induced magnetosphere, making use of Cassini RPWS, CAPS, and MAG measurements from 82 flybysWe derive the first global electron density map of Titan's near environment and delimit an average induced magnetosphere shapeWe identified pickup ions with energies between 10 eV and 3 keV, increasing along the 0.7 mV m−1 ${\mathrm{m}}^{-1}$ convective electric field [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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=8gh&AN=193321972
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      – Type: doi
        Value: 10.1029/2025JA034830
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      – Code: eng
        Text: English
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        PageCount: 16
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      – SubjectFull: Magnetosphere
        Type: general
      – SubjectFull: Atmospheric ionization
        Type: general
      – SubjectFull: Magnetic field measurements
        Type: general
      – SubjectFull: Electric fields
        Type: general
      – SubjectFull: Fast ions
        Type: general
      – SubjectFull: Electron density
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      – SubjectFull: Cassini (Spacecraft)
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      – TitleFull: Plasma Dynamics and Structure of Titan's Induced Magnetosphere From Wave, Magnetic Field, and Plasma Measurements.
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