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Title: The two-way relationship between ionospheric outflow and the ring current

Abstract

It is now well established that the ionosphere, because it acts as a significant source of plasma, plays a critical role in ring current dynamics. However, because the ring current deposits energy into the ionosphere, the inverse may also be true: the ring current can play a critical role in the dynamics of ionospheric outflow. This study uses a set of coupled, first-principles-based numerical models to test the dependence of ionospheric outflow on ring current-driven region 2 field-aligned currents (FACs). A moderate magnetospheric storm event is modeled with the Space Weather Modeling Framework using a global MHD code (Block Adaptive Tree Solar wind Roe-type Upwind Scheme, BATS-R-US), a polar wind model (Polar Wind Outflow Model), and a bounce-averaged kinetic ring current model (ring current atmosphere interaction model with self-consistent magnetic field, RAM-SCB). Initially, each code is two-way coupled to all others except for RAM-SCB, which receives inputs from the other models but is not allowed to feed back pressure into the MHD model. The simulation is repeated with pressure coupling activated, which drives strong pressure gradients and region 2 FACs in BATS-R-US. It is found that the region 2 FACs increase heavy ion outflow by up to 6 times overmore » the non-coupled results. The additional outflow further energizes the ring current, establishing an ionosphere-magnetosphere mass feedback loop. This study further demonstrates that ionospheric outflow is not merely a plasma source for the magnetosphere but an integral part in the nonlinear ionosphere-magnetosphere-ring current system.« less

Authors:
 [1];  [2];  [3];  [1];  [1];  [4]
+ Show Author Affiliations
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. NASA Goddard Space Flight Center, Greenbelt, MD (United States)
  4. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1215633
Report Number(s):
LA-UR-14-28956
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 6; Journal ID: ISSN 2169-9380
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 97 MATHEMATICS AND COMPUTING; Heliospheric and Magnetospheric Physics

Citation Formats

Welling, Daniel T., Jordanova, Vania Koleva, Glocer, Alex, Toth, Gabor, Liemohn, Michael W., and Weimer, Dan R. The two-way relationship between ionospheric outflow and the ring current. United States: N. p., 2015. Web. doi:10.1002/2015JA021231.
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Welling, Daniel T., Jordanova, Vania Koleva, Glocer, Alex, Toth, Gabor, Liemohn, Michael W., & Weimer, Dan R. The two-way relationship between ionospheric outflow and the ring current. United States. https://doi.org/10.1002/2015JA021231
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Welling, Daniel T., Jordanova, Vania Koleva, Glocer, Alex, Toth, Gabor, Liemohn, Michael W., and Weimer, Dan R. Mon . "The two-way relationship between ionospheric outflow and the ring current". United States. https://doi.org/10.1002/2015JA021231. https://www.osti.gov/servlets/purl/1215633.
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@article{osti_1215633,
title = {The two-way relationship between ionospheric outflow and the ring current},
author = {Welling, Daniel T. and Jordanova, Vania Koleva and Glocer, Alex and Toth, Gabor and Liemohn, Michael W. and Weimer, Dan R.},
abstractNote = {It is now well established that the ionosphere, because it acts as a significant source of plasma, plays a critical role in ring current dynamics. However, because the ring current deposits energy into the ionosphere, the inverse may also be true: the ring current can play a critical role in the dynamics of ionospheric outflow. This study uses a set of coupled, first-principles-based numerical models to test the dependence of ionospheric outflow on ring current-driven region 2 field-aligned currents (FACs). A moderate magnetospheric storm event is modeled with the Space Weather Modeling Framework using a global MHD code (Block Adaptive Tree Solar wind Roe-type Upwind Scheme, BATS-R-US), a polar wind model (Polar Wind Outflow Model), and a bounce-averaged kinetic ring current model (ring current atmosphere interaction model with self-consistent magnetic field, RAM-SCB). Initially, each code is two-way coupled to all others except for RAM-SCB, which receives inputs from the other models but is not allowed to feed back pressure into the MHD model. The simulation is repeated with pressure coupling activated, which drives strong pressure gradients and region 2 FACs in BATS-R-US. It is found that the region 2 FACs increase heavy ion outflow by up to 6 times over the non-coupled results. The additional outflow further energizes the ring current, establishing an ionosphere-magnetosphere mass feedback loop. This study further demonstrates that ionospheric outflow is not merely a plasma source for the magnetosphere but an integral part in the nonlinear ionosphere-magnetosphere-ring current system.},
doi = {10.1002/2015JA021231},
journal = {Journal of Geophysical Research. Space Physics},
number = 6,
volume = 120,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 2015},
month = {Mon Jun 01 00:00:00 EDT 2015}
}
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  • DOI: 10.1029/2008JA013325

3-D force-balanced magnetospheric configurations
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Effect of storm-time plasma pressure on the magnetic field in the inner magnetosphere
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Self-consistent modeling of magnetic fields and plasmas in the inner magnetosphere: Application to a geomagnetic storm
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Relationship between Region 2 field-aligned current and the ring current: Model results
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  • Zheng, Y.; Lui, A. T. Y.; Fok, M. -C.
  • Journal of Geophysical Research, Vol. 111, Issue A11
  • DOI: 10.1029/2006JA011603
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