Transcript Overview of Ionosphere-Thermosphere Modeling in CISM S.C. Solomon, A.G. Burns, G.

Overview of Ionosphere-Thermosphere Modeling in CISM
S.C. Solomon, A.G. Burns, G. Jee, T.L. Killeen, J. Lei, A. Maute, L. Qian, A.D. Richmond, R.G. Roble, W. Wang, M. Wiltberger, and Z. Zeng
High Altitude Observatory, National Center for Atmospheric Research
Abstract
The Ionosphere-Thermosphere modeling component of the CISM project is responsible for development of general circulation models of the upper atmosphere system and their
coupling to the magnetosphere. The Coupled Magnetosphere-Ionosphere-Thermosphere model (CMIT) consists of the Lyon-Fedder-Mobarry (LFM) Magnetosphere model
coupled to the NCAR Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM). Studies using the coupled and stand-alone models show considerable
improvement over empirical-model descriptions of the thermosphere and ionosphere. We are working on extending ionospheric models into the plasmasphere, collaborating with
data assimilation activities, conducting an extensive validation effort, and including ion outflow in the feedback to the magnetosphere.
The NCAR Thermosphere-IonosphereElectrodynamics General Circulation Model
(TIE-GCM)
The Coupled MagnetosphereIonosphere-Thermosphere Model
(CMIT)
The December 2006 “AGU Storm”
LFM
Jll, np,Tp
E
Magnetosphere Ionosphere Coupler
(H+P) = Jll-Jw
Particle precipitation:
Fe, E0
Conductivities: p, h,
Winds: Jw
Electric Potential:
tot
TIE-GCM
GSWM
Neutral density simulations over the declining phase of solar cycle 23 made by
the NCAR TIE-GCM using observed solar spectral irradiance inputs from
measurements by the TIMED Solar EUV Experiment. Comparison to satellite
drag density measurements shows improved agreement over empirical models.
CMIT simulations of Total Electron Content (TEC).
GPS measurements of Total Electron Content.
Vertical Drift (m/s)
Plans and Goals
Vertical Drift (m/s)
ITM Goals:
Plasmasphere extension to TIE-GCM
Solar Energetic Particle fluxes and ionization
High-resolution TIE-GCM in coupled models
Transition to TIME-GCM in coupled models
ECMWF analysis fields at lower boundary
Systematic ionospheric updates from GAIM
Near-real-time solar irradiance inputs
Short-term forecast of solar irradiance inputs
Comparison of TIE-GCM ionospheric climatology at low solar activity during summer
2006 to initial measurements by the COSMIC satellites using GPS occulations.
Vertical ion drift at the magnetic equator during the April 2004 “CAWSES”
event — simulations by the stand-alone TIE-GCM and CMIT compared to
radar measurements at Jicamarca.
Center for Integrated Space Weather Modeling
•
Annual Site Visit
•
5 June 2007
Cross-Thrust Goals:
Inclusion of auroral acceleration module
Specification of ion outflow rates
Plasmaspheric coupling from the Rice Convection Model (RCM):
Electric Fields
Precipitation