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RCM-CTIPe coupling

RCM-CTIPe coupling. N. Maruyama, T. Fuller-Rowell, M. Codrescu, D. Anderson, Richmond, A. Maute, S. Sazykin, F. Toffoletto, R. Spiro, R. Wolf, G. Millward. RCM. Coupling RCM & CTIPe. Hot Plasma transport in E, B fields. Auroral Precipitation. J// (PP). E. Potential (dynamo) Solver.

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RCM-CTIPe coupling

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  1. RCM-CTIPe coupling N. Maruyama, T. Fuller-Rowell, M. Codrescu, D. Anderson, Richmond, A. Maute, S. Sazykin, F. Toffoletto, R. Spiro, R. Wolf, G. Millward

  2. RCM Coupling RCM & CTIPe Hot Plasma transport in E, B fields Auroral Precipitation J// (PP) E Potential (dynamo) Solver Solve J=0 E-field E Un ∑ (DD) CTIP IonosphericNe, Te Ion Ti, composition Field-aligned Vi Conductance ∑ Thermospheric neutral density, composition wind velocity fields

  3. 6 7 8 9 10 Nov 7-10, 2004 storm CTIPe simulation ? CPCP [Sazykin et al.] Disturbance Dynamo Challenges for the coupled model: _Identify the sources of storm-time disturbed E-fields _Interactions/preconditioning Prompt Penetration Observation

  4. 20 min [kV] 150 25 0 3 9 15 21 UT[hrs] 6 hrs Idealized Storm Simulation • This time variation was chosen to try to identify the two sources of the disturbed E-fields (PP & DD), and their interaction in a simpler case. • Magnetospheric B-field is kept constant to understand the response only to CPCP variation at first. CPCP Temporal Variation [Foster et al., 1986]

  5. (A) 3.5UT (B) 4.5UT (C) 5.5UT ExB drift [m/s] MLT [hrs] Challenge (1): Identify the sources of storm-time disturbed E-fields

  6. Prompt Penetration(1) Eastward E-field Coup RCM-CTIP [Figure from Sazykin, 2000]

  7. Prompt Penetration(2) Equatorward E-field [Figure from Sazykin, 2000] Coup RCM-CTIP

  8. RCM Pressure DistributionHow to estimate Shielding Time Scale? Standalone RCM Coupled RCM_CTIP 3.5UT 4.5UT

  9. Disturbance DynamoCTIP Disturbed Neutral Wind Coupled RCM_CTIP Standalone CTIPe 5.5UT 15UT

  10. Challenge (2) Interactions/preconditioning (D) 15.5UT (E) 16.5UT (F) 17.5UT ExB drift [m/s] MLT [hrs]

  11. (A) 3.5UT (D) 15.5UT (E) 16.5UT (B) 4.5UT (F) 17.5UT (C) 5.5UT ExB drift [m/s] ExB drift [m/s] MLT [hrs] MLT [hrs] Interactions/Preconditioning

  12. RCM Pressure DistributionHas shielding been established? Standalone RCM Coupled RCM_CTIP 3.5UT 15.5UT

  13. Impact of Auroral Conductance (1) PI=10 (2) PI=7 Why penetration increases due to auroral enhancement???

  14. (A) 3.5UT (B) 4.5UT (C) 5.5UT ExB drift [m/s] MLT [hrs] Shielding time scale (D) 3.5UT (E) 4.5UT (F) 5.5UT ExB drift [m/s] MLT [hrs]

  15. Potential Dynamo Solver [Richmond and Maute] New Global Potential (dynamo) solver Variable spatial resolution to accommodate to resolve the RCM field aligned currents APEX coordinate system (more realistic representation of the geomagnetic field, based on IGRF) [Richmond, 1995] Time dependent boundary defined by RCM separating out the self-consistent and imposed regions Requires to specify the high latitude potential: Heelis model

  16. Objectives of This Project  Determine the role of electrodynamics in the massive restructuring of the mid and low latitude plasma  Investigate the interaction and feedback between prompt penetration and disturbance dynamo fields  Elucidate the likely sources of the strong longitude dependence in the storm-time response  Explore the relationship between SAPs and the plumes of plasma referred to as SEDs

  17. Task II: Comprehensive Validation Focused storms:  Apr 6-7 2000  Jul 16 2000  Mar 31 2001  Apr 17-20 2002  Oct 30-31 2003  Nov 20 2003 Observational Tools:  GPS-TEC  Jicamarca ISR  ∆H inferred drift  DMSP

  18. Task III: Numerical Experiments • Relative importance of penetration and disturbance-dynamo fields during storms and how do they interact [Richmond et al., 2003; Maruyama et al, 2005] • Neutral winds and their inertia following a storm affect the interaction between the inner magnetosphere and the ionosphere [Peymirat et al., 2002] • Role of self-consistent electrodynamic interaction of the ionosphere-thermosphere on the ring current pressure distribution and the dynamics of the plasmasphere [Burch et al., 2004] • Longitudinal variations of the geomagnetic field affect penetration and disturbance dynamo [Huang et al., 2005] • Dipole-tilt (e.g., seasonal) variations of the conductances and magnetospheric magnetic field affect on E-field penetration

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