Articles | Volume 14, issue 2
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, Binzheng Zhang, Jiuhou Lei, Wenbin Wang, Alan Burns, Han-li Liu, Kevin Pham, and Kareem A. Sorathia


Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Jiuhou Lei on behalf of the Authors (18 Dec 2020)  Author's response   Manuscript 
ED: Publish subject to technical corrections (21 Dec 2020) by Josef Koller
AR by Jiuhou Lei on behalf of the Authors (24 Dec 2020)  Author's response   Manuscript 
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.