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RAM-SCB (v.2.2)

Ring current Atmosphere interaction Model (RAM) with Self-Consistent Magnetic Field (B) (SCB)

Model Description

The RAM‐SCB model includes two fully coupled modules: a kinetic ring current‐atmosphere interaction model (RAM) [Jordanova et al., 1994, 2006, 2010; Engel et al., 2019] self‐consistently coupled with a 3‐D equilibrium magnetic field (B) code [Zaharia et al., 2004, 2006, 2010; Engel et al., 2019]. It has been validated via a variety of spaceborne observations and geomagnetic indices [e.g., Yu et al., 2012, 2019]. The model determines the magnetic field configuration in three dimensions and the particle distribution functions Ql(R,ϕ,E,α) from bounce‐averaged Fokker‐Planck equations for both ring current ions and electrons in the equatorial plane: where Ql (l represents different species) is a function of radial distance (R), geomagnetic longitude (ϕ), energy (E), and pitch angle (α). The default grid spans 2 to 6.5 Re in radius with a spatial resolution of 0.25 Re, a longitude resolution of 15°. The energy grid is logarithmically-spaced (default 35 steps) between 0.15 and 400 keV, and the pitch angle grid covers 0 to 90° (default 72 linear steps).

Model Figure(s) :

Model Inputs Description

Initial fluxes - usually taken from measurements at quiet times, such as from Van Allen Probes
SCB's magnetic field boundary is usually taken from a magnetic field model or global MHD simulations
RAM's plasma boundary is usually taken from GEO observations or other model outputs at 6.5 Re

Model Outputs Description

ion and electron fluxes (0.15 - 400 keV) as a function of radial distance, local time, energy, pitch angle; 
also time dependent 3-D magnetic field configurations 

Model Caveats

This RoR version uses Kp-dependent Volland-Stern electric field and statistical plasma boundary models.

Change Log

Model Acknowledgement/Publication Policy (if any)

Please acknowledge the software repository https://github.com/lanl/RAM-SCB and cite the code archive at https://doi.org/10.5281/zenodo.6977287

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