Articles | Volume 14, issue 2
Geosci. Model Dev., 14, 859–873, 2021
https://doi.org/10.5194/gmd-14-859-2021
Geosci. Model Dev., 14, 859–873, 2021
https://doi.org/10.5194/gmd-14-859-2021

Development and technical paper 10 Feb 2021

Development and technical paper | 10 Feb 2021

Azimuthal averaging–reconstruction filtering techniques for finite-difference general circulation models in spherical geometry

Tong Dang et al.

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Short summary
This paper describes a numerical treatment (ring average) to relax the time step in finite-difference schemes when using spherical and cylindrical coordinates with axis singularities. The ring average is used to develop a high-resolution thermosphere–ionosphere coupled community model. The technique is a significant improvement in space weather modeling capability, and it can also be adapted to more general finite-difference solvers for hyperbolic equations in spherical and polar geometries.