Ionosphere-Thermosphere Modeling

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Ionosphere-Thermosphere Modeling
Stan Solomon, Alan Burns, Tim Killeen, Astrid
Maute, Liying Qian, Art Richmond, Ray Roble,
Wenbin Wang, and Mike Wiltberger High Altitude
ObservatoryNational Center for Atmospheric
Research
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Ionosphere-Thermosphere Accomplishments
Coupled Magnetosphere-Ionosphere-Thermosphere
(CMIT) model v. 1.0 (LFM coupled to TING)
delivered to CCMC CMIT v. 2.0 (LFM coupled to
TIE-GCM) Investigated non-linear interaction
between penetration electric field and
disturbance dynamo on low-latitude ionosphere
using RCM Fully self-consistent calculation of
neutral-wind feedback effects on the
magnetosphere-ionosphere circuit
Parameterization of solar photoelectron effects
on the ionosphere Incorporated plasmasphere
module into a prototype extended-altitude version
of the TIE-GCM Initialized ionosphere-thermosphe
re model using specification electron density
distribution from the GAIM data assimilation
model and determined persistence time under
various conditions
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The Coupled Magnetosphere-Ionosphere-Thermosphere
Model (CMIT)
LFM
E
Jll, np,Tp
Magnetosphere - Ionosphere Coupler
??(?H?P)?????Jll-Jw
Particle precipitation Fe, E0
Conductivities? ?p, ?h, Winds Jw
Electric Potential ?tot
TING
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The May 1997 Storm
WIND
CORHEL
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Simulation of the Geospace response
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Ionosphere-Thermosphere Response
Electron density at 120 km altitude with ion
drift velocity vectors superimposed
Neutral temperature at 250 km altitude with
neutral wind velocity superimposed
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Geospace Response to May 1997 Storm
WIND
CORHEL
WIND
CORHEL
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Thermospheric Wind Shear during Disturbances
Zonal Wind
Meridional Wind
During Storm
Before Storm
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Wind-Driven Current Feedback
Ion Drifts ?p (mho)
Neutral Winds Temps (K)
Where I is the magnetic field inclination
angle B is the magnetic field vector b is
the magnetic field unit vector z1 and z2 are
min and max model altitudes ?p, ?h are the
Pedersen and Hall conductivities U is the
neutral wind velocity
Jw (?A/m2)
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Solar Flare Effects Ionosphere
Comparison of TEC measurements Tsurutani et al.,
2005 obtained from a global network of GPS
stations with a TIE-GCM model description near
the peak of the 28 October 2003 flare.
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Solar Flare Effects Neutral Atmosphere
Neutral Density Measurements from accelerometers
on CHAMP and GRACE satellites
TIE-GCM Simulations at same altitude and local
time
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Current Work TIE-GCM Coupling (CMIT 2.0)
LFM
E
Jll, np,Tp
Magnetosphere - Ionosphere Coupler
??(?H?P)?????Jll-Jw
Particle precipitation Fe, E0
Conductivities? ?p, ?h, Winds Jw
Electric Potential ?tot
TIE-GCM
Middle Atmosphere (GSWM)
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Current Work LFM-RCM-TIEGCM Coupling
CMIT without RCM inner magnetosphere CMIT
with LFM-RCM two-way coupling
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Electrodynamics and Plasmasphere
Example NmF2 calculation by the Global
Ionosphere-Plasmasphere module being coupled to
the TIE-GCM
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Ionospheric Data Assimilation
Initialization
After 1 hour
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Goals for the Next Six Years
ITM Goals Plasmasphere extension to TIE-GCM in
coupled models SEP fluxes and ionization
throughout atmosphere High-resolution version of
TIE-GCM in coupled models Transition to TIME-GCM
in coupled models High-resolution version of
TIME-GCM in coupled models Inclusion of NCEP
analysis fields at TIME-GCM lower
boundary Systematic ionospheric updates from GAIM
specification fields Near-real-time solar
irradiance inputs Short-term forecast of solar
irradiance inputs Cross-Thrust Goals Inclusion
of auroral acceleration module in coupled
model Specification of ion outflow rates to
magnetosphere Electric fields from RCM coupled to
plasmasphere/ionosphere Precipitation from RCM
imposed on thermosphere/ionosphere