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SAMI3 (3.22)

SAMI3: Global Ionosphere/Plasmasphere Model

Model Description

SAMI3 (Sami3 is A Model of the Ionosphere) is a seamless, three-dimensional, physics-based model of the ionosphere. It is based on SAMI2, a two-dimensional model of the ionosphere [Huba et al., 2000]. SAMI3 models the plasma and chemical evolution of seven ion species (H+, He+, N+, O+, N+2, NO+ and O+2). The temperature equation is solved for three ion species (H+, He+ and O+) and for the electrons. Ion inertia is included in the ion momentum equation for motion along the geomagnetic field. This is important in modeling the topside ionosphere and plasmasphere where the plasma becomes collisionless. The neutral composition, temperature, and winds can be specified in SAMI3 by the empirical models NRLMSISE00 and HWM14. SAMI3 includes 21 chemical reactions and radiative recombination. SAMI3 uses the EUVAC model for solar radiation. SAMI3 uses a nonorthogonal, nonuniform, fixed grid for the magnetic latitude range +/- 88 degrees. The electric field, driven by the neutral wind dynamo, is determined from the solution of a 2D potential equation [Huba et at., 2008]. The high latitude electric field is calculated from the empirical Weimer model for the potential. The model uses the Richmond apex model [Richmond, 1995] to specify the magnetic field (i.e., IGRF).

Model Figure(s) :

Model Inputs Description

F10.7 (1 day)
F10.7A (3 month average)
Ap index
Kp Index
day-of-year
year

Model Outputs Description

ion density
ion temperature
ion velocity
electron temperature
NmF2
hmF2
TEC (Total Electron Content)
Electron Density
ExB drifts 

Model Caveats

Change Log

12/02/2024: SAMI3 coupled with WACCM-X is available for SAMI3 Runs-On-Request simulation service at the CCMC.
The codes are one-way coupled in that WACCM-X provides the neutral composition, temperature, and winds as inputs to SAMI3. WACCM-X can self-consistently resolve mesoscale and large-scale gravity waves, tides, and planetary waves. With the inputs from WACCM-X, SAMI3 can self-consistently generate equatorial plasma bubbles.

Model Acknowledgement/Publication Policy (if any)

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Curator: Chiu Wiegand | NASA Official: Dr. Masha Kuznetsova | Privacy and Security Notices | Accessibility | CCMC Data Collection Consent Agreement