The two‐way relationship between ionospheric outflow and the ring current

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  • D. T. Welling
    Department of Atmospheric, Oceanic, and Space Sciences University of Michigan Ann Arbor Michigan USA
  • V. K. Jordanova
    Los Alamos National Laboratory Los Alamos New Mexico USA
  • A. Glocer
    NASA Goddard Space Flight Center Greenbelt Maryland USA
  • G. Toth
    Department of Atmospheric, Oceanic, and Space Sciences University of Michigan Ann Arbor Michigan USA
  • M. W. Liemohn
    Department of Atmospheric, Oceanic, and Space Sciences University of Michigan Ann Arbor Michigan USA
  • D. R. Weimer
    Center for Space Science and Engineering Research, Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg Virginia USA

書誌事項

公開日
2015-06
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2015ja021231
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>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 noncoupled 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.</jats:p>

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