Home > Research > Publications & Outputs > The effect of field-aligned currents and centri...

Associated organisational unit

Electronic data

  • MartinEtAl_2020_SaturnIonosphericOutflow_accepted

    Rights statement: Accepted for publication in Journal of Geophysical Research:Space Physics. Copyright 2020 American Geophysical Union. Further reproduction or electronic distribution is not permitted.

    Accepted author manuscript, 411 KB, PDF document

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

Links

Text available via DOI:

View graph of relations

The effect of field-aligned currents and centrifugal forces on ionospheric outflow at Saturn

Research output: Contribution to journalJournal articlepeer-review

Published

Standard

The effect of field-aligned currents and centrifugal forces on ionospheric outflow at Saturn. / Martin, Carley; Ray, Licia C; Felici, M.; Constable, DA; Lorch, Chris; Kinrade, Joe; Gray, Rebecca.

In: Journal of Geophysical Research: Space Physics, Vol. 125, No. 7, e2019JA027728, 01.07.2020.

Research output: Contribution to journalJournal articlepeer-review

Harvard

APA

Vancouver

Author

Bibtex

@article{0df2369c9f1e49d383726ba9b7f06556,
title = "The effect of field-aligned currents and centrifugal forces on ionospheric outflow at Saturn",
abstract = "Ionospheric outflow is driven by an ambipolar electric field induced due to the separation of electrons and ions in a gravitational field when equilibrium along a magnetic field line is lost. A model of ionospheric outflow at Saturn was developed using transport equations to estimate the number of charged particles that flow from the auroral regions into the magnetosphere. The model evaluates the outflow from 1,400 km in altitude above the 1 bar level, to 3 RS along the field line. The main ion constituents evaluated are R+ and R+3. We consider the centrifugal force exerted on the particles due to a fast rotation rate, along with the effects of field‐aligned currents present in the auroral regions. The total number flux from both auroral regions is found to be 5.5–13.0×1027 s−1, which relates to a total mass source of 5.5–17.7 kg s−1. These values are on average an order of magnitude higher than expected without the additional effects of centrifugal force and field‐aligned currents. We find the ionospheric outflow rate to be comparable to the lower estimates of the mass loading rate from Enceladus and are in agreement with recent Cassini observations. This additional mass flux into the magnetosphere can substantially affect the dynamics and composition of the inner and middle magnetosphere of Saturn.",
author = "Carley Martin and Ray, {Licia C} and M. Felici and DA Constable and Chris Lorch and Joe Kinrade and Rebecca Gray",
note = "Accepted for publication in Journal of Geophysical Research:Space Physics. Copyright 2020 American Geophysical Union. Further reproduction or electronic distribution is not permitted.",
year = "2020",
month = jul,
day = "1",
doi = "10.1029/2019JA027728",
language = "English",
volume = "125",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "7",

}

RIS

TY - JOUR

T1 - The effect of field-aligned currents and centrifugal forces on ionospheric outflow at Saturn

AU - Martin, Carley

AU - Ray, Licia C

AU - Felici, M.

AU - Constable, DA

AU - Lorch, Chris

AU - Kinrade, Joe

AU - Gray, Rebecca

N1 - Accepted for publication in Journal of Geophysical Research:Space Physics. Copyright 2020 American Geophysical Union. Further reproduction or electronic distribution is not permitted.

PY - 2020/7/1

Y1 - 2020/7/1

N2 - Ionospheric outflow is driven by an ambipolar electric field induced due to the separation of electrons and ions in a gravitational field when equilibrium along a magnetic field line is lost. A model of ionospheric outflow at Saturn was developed using transport equations to estimate the number of charged particles that flow from the auroral regions into the magnetosphere. The model evaluates the outflow from 1,400 km in altitude above the 1 bar level, to 3 RS along the field line. The main ion constituents evaluated are R+ and R+3. We consider the centrifugal force exerted on the particles due to a fast rotation rate, along with the effects of field‐aligned currents present in the auroral regions. The total number flux from both auroral regions is found to be 5.5–13.0×1027 s−1, which relates to a total mass source of 5.5–17.7 kg s−1. These values are on average an order of magnitude higher than expected without the additional effects of centrifugal force and field‐aligned currents. We find the ionospheric outflow rate to be comparable to the lower estimates of the mass loading rate from Enceladus and are in agreement with recent Cassini observations. This additional mass flux into the magnetosphere can substantially affect the dynamics and composition of the inner and middle magnetosphere of Saturn.

AB - Ionospheric outflow is driven by an ambipolar electric field induced due to the separation of electrons and ions in a gravitational field when equilibrium along a magnetic field line is lost. A model of ionospheric outflow at Saturn was developed using transport equations to estimate the number of charged particles that flow from the auroral regions into the magnetosphere. The model evaluates the outflow from 1,400 km in altitude above the 1 bar level, to 3 RS along the field line. The main ion constituents evaluated are R+ and R+3. We consider the centrifugal force exerted on the particles due to a fast rotation rate, along with the effects of field‐aligned currents present in the auroral regions. The total number flux from both auroral regions is found to be 5.5–13.0×1027 s−1, which relates to a total mass source of 5.5–17.7 kg s−1. These values are on average an order of magnitude higher than expected without the additional effects of centrifugal force and field‐aligned currents. We find the ionospheric outflow rate to be comparable to the lower estimates of the mass loading rate from Enceladus and are in agreement with recent Cassini observations. This additional mass flux into the magnetosphere can substantially affect the dynamics and composition of the inner and middle magnetosphere of Saturn.

U2 - 10.1029/2019JA027728

DO - 10.1029/2019JA027728

M3 - Journal article

VL - 125

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 7

M1 - e2019JA027728

ER -