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    Rights statement: An edited version of this paper was published by AGU. Copyright 2019 American Geophysical Union. Sorba, A. M., Achilleos, N. A., Sergis, N., Guio, P., Arridge, C. S., & Dougherty, M. K. ( 2019). Local time variation in the large‐scale structure of Saturn's magnetosphere. Journal of Geophysical Research: Space Physics, 124. https://doi.org/10.1029/2018JA026363 To view the published open abstract, go to http://dx.doi.org and enter the DOI.

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Local time variation in the large-scale structure of Saturn's magnetosphere

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Local time variation in the large-scale structure of Saturn's magnetosphere. / Sorba, Arianna; Achilleos, Nicholas; Sergis, Nick; Guio, P.; Arridge, Chris; Dougherty, M. K.

In: Journal of Geophysical Research: Space Physics, Vol. 124, No. 9, 23.10.2019, p. 7425-7441.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Sorba, A, Achilleos, N, Sergis, N, Guio, P, Arridge, C & Dougherty, MK 2019, 'Local time variation in the large-scale structure of Saturn's magnetosphere', Journal of Geophysical Research: Space Physics, vol. 124, no. 9, pp. 7425-7441. https://doi.org/10.1029/2018JA026363

APA

Sorba, A., Achilleos, N., Sergis, N., Guio, P., Arridge, C., & Dougherty, M. K. (2019). Local time variation in the large-scale structure of Saturn's magnetosphere. Journal of Geophysical Research: Space Physics, 124(9), 7425-7441. https://doi.org/10.1029/2018JA026363

Vancouver

Sorba A, Achilleos N, Sergis N, Guio P, Arridge C, Dougherty MK. Local time variation in the large-scale structure of Saturn's magnetosphere. Journal of Geophysical Research: Space Physics. 2019 Oct 23;124(9):7425-7441. https://doi.org/10.1029/2018JA026363

Author

Sorba, Arianna ; Achilleos, Nicholas ; Sergis, Nick ; Guio, P. ; Arridge, Chris ; Dougherty, M. K. / Local time variation in the large-scale structure of Saturn's magnetosphere. In: Journal of Geophysical Research: Space Physics. 2019 ; Vol. 124, No. 9. pp. 7425-7441.

Bibtex

@article{dadc7a6b162940a4bc45af6e5c5e5e3d,
title = "Local time variation in the large-scale structure of Saturn's magnetosphere",
abstract = "The large‐scale structure of Saturn's magnetosphere is determined by internal and external factors, including the rapid planetary rotation rate, significant internal hot and cold plasma sources, and varying solar wind pressure. Under certain conditions the dayside magnetospheric magnetic field changes from a dipolar to more disk‐like structure, due to global force balance being approximately maintained during the reconfiguration. However, it is still not fully understood which factors dominantly influence this behavior, and in particular how it varies with local time. We explore this in detail using a 2‐D force‐balance model of Saturn's magnetodisk to describe the magnetosphere at different local time sectors. For model inputs, we use recent observational results that suggest a significant local time asymmetry in the pressure of the hot (>3 keV) plasma population, and magnetopause location. We make calculations under different solar wind conditions, in order to investigate how these local time asymmetries influence magnetospheric structure for different system sizes. We find significant day/night asymmetries in the model magnetic field, consistent with recent empirical studies based on Cassini magnetometer observations. We also find dawn‐dusk asymmetries in equatorial current sheet thickness, with the varying hot plasma content and magnetodisk radius having comparable influence on overall structure, depending on external conditions. We also find significant variations in magnetic mapping between the ionosphere and equatorial disk, and ring current intensity, with substantial enhancements in the night and dusk sectors. These results have consequences for interpreting many magnetospheric phenomena that vary with local time, such as reconnection events and auroral observations.",
keywords = "Saturn, magnetosphere, local time, current sheet, magnetodisk, ionosphere",
author = "Arianna Sorba and Nicholas Achilleos and Nick Sergis and P. Guio and Chris Arridge and Dougherty, {M. K.}",
note = "An edited version of this paper was published by AGU. Copyright 2019 American Geophysical Union. Sorba, A. M., Achilleos, N. A., Sergis, N., Guio, P., Arridge, C. S., & Dougherty, M. K. ( 2019). Local time variation in the large‐scale structure of Saturn's magnetosphere. Journal of Geophysical Research: Space Physics, 124. https://doi.org/10.1029/2018JA026363 To view the published open abstract, go to http://dx.doi.org and enter the DOI.",
year = "2019",
month = oct,
day = "23",
doi = "10.1029/2018JA026363",
language = "English",
volume = "124",
pages = "7425--7441",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "9",

}

RIS

TY - JOUR

T1 - Local time variation in the large-scale structure of Saturn's magnetosphere

AU - Sorba, Arianna

AU - Achilleos, Nicholas

AU - Sergis, Nick

AU - Guio, P.

AU - Arridge, Chris

AU - Dougherty, M. K.

N1 - An edited version of this paper was published by AGU. Copyright 2019 American Geophysical Union. Sorba, A. M., Achilleos, N. A., Sergis, N., Guio, P., Arridge, C. S., & Dougherty, M. K. ( 2019). Local time variation in the large‐scale structure of Saturn's magnetosphere. Journal of Geophysical Research: Space Physics, 124. https://doi.org/10.1029/2018JA026363 To view the published open abstract, go to http://dx.doi.org and enter the DOI.

PY - 2019/10/23

Y1 - 2019/10/23

N2 - The large‐scale structure of Saturn's magnetosphere is determined by internal and external factors, including the rapid planetary rotation rate, significant internal hot and cold plasma sources, and varying solar wind pressure. Under certain conditions the dayside magnetospheric magnetic field changes from a dipolar to more disk‐like structure, due to global force balance being approximately maintained during the reconfiguration. However, it is still not fully understood which factors dominantly influence this behavior, and in particular how it varies with local time. We explore this in detail using a 2‐D force‐balance model of Saturn's magnetodisk to describe the magnetosphere at different local time sectors. For model inputs, we use recent observational results that suggest a significant local time asymmetry in the pressure of the hot (>3 keV) plasma population, and magnetopause location. We make calculations under different solar wind conditions, in order to investigate how these local time asymmetries influence magnetospheric structure for different system sizes. We find significant day/night asymmetries in the model magnetic field, consistent with recent empirical studies based on Cassini magnetometer observations. We also find dawn‐dusk asymmetries in equatorial current sheet thickness, with the varying hot plasma content and magnetodisk radius having comparable influence on overall structure, depending on external conditions. We also find significant variations in magnetic mapping between the ionosphere and equatorial disk, and ring current intensity, with substantial enhancements in the night and dusk sectors. These results have consequences for interpreting many magnetospheric phenomena that vary with local time, such as reconnection events and auroral observations.

AB - The large‐scale structure of Saturn's magnetosphere is determined by internal and external factors, including the rapid planetary rotation rate, significant internal hot and cold plasma sources, and varying solar wind pressure. Under certain conditions the dayside magnetospheric magnetic field changes from a dipolar to more disk‐like structure, due to global force balance being approximately maintained during the reconfiguration. However, it is still not fully understood which factors dominantly influence this behavior, and in particular how it varies with local time. We explore this in detail using a 2‐D force‐balance model of Saturn's magnetodisk to describe the magnetosphere at different local time sectors. For model inputs, we use recent observational results that suggest a significant local time asymmetry in the pressure of the hot (>3 keV) plasma population, and magnetopause location. We make calculations under different solar wind conditions, in order to investigate how these local time asymmetries influence magnetospheric structure for different system sizes. We find significant day/night asymmetries in the model magnetic field, consistent with recent empirical studies based on Cassini magnetometer observations. We also find dawn‐dusk asymmetries in equatorial current sheet thickness, with the varying hot plasma content and magnetodisk radius having comparable influence on overall structure, depending on external conditions. We also find significant variations in magnetic mapping between the ionosphere and equatorial disk, and ring current intensity, with substantial enhancements in the night and dusk sectors. These results have consequences for interpreting many magnetospheric phenomena that vary with local time, such as reconnection events and auroral observations.

KW - Saturn

KW - magnetosphere

KW - local time

KW - current sheet

KW - magnetodisk

KW - ionosphere

U2 - 10.1029/2018JA026363

DO - 10.1029/2018JA026363

M3 - Journal article

VL - 124

SP - 7425

EP - 7441

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 9

ER -