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

Journal Article · · Journal of Geophysical Research. Space Physics
 [1];  [2];  [3];  [1];  [1];  [4]
  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)

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.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1215633
Report Number(s):
LA-UR-14-28956
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 6 Vol. 120; ISSN 2169-9380
Country of Publication:
United States
Language:
English

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Cited By (8)

How does mass loading impact local versus global control on dayside reconnection?: MASS LOADING AND DAYSIDE RECONNECTION journal March 2016
Transition from global to local control of dayside reconnection from ionospheric-sourced mass loading: MAGNETOSHEATH RECONFIGURATIONS journal September 2017
Low‐Altitude Emission of Energetic Neutral Atoms: Multiple Interactions and Energy Loss journal October 2017
Contribution of energetic and heavy ions to the plasma pressure: The 27 September to 3 October 2002 storm: PLASMA PRESSURE DURING MAGNETIC STORM journal September 2017
Modelling by Spherical Cap Harmonic Analysis: A Literature Review journal November 2019
Magnetosphere‐Ionosphere Connection of Storm‐Time Region‐2 Field‐Aligned Current and Ring Current: Arase and AMPERE Observations journal November 2018
Recent Advancements and Remaining Challenges Associated With Inner Magnetosphere Cross‐Energy/Population Interactions (IMCEPI) journal February 2019
Oxygen Ion Dynamics in the Earth's Ring Current: Van Allen Probes Observations journal October 2019

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