Documentation: TIEGCM ReadtheDocs
| Subdirectory | Description | Summary of Contents |
|---|---|---|
| scripts/ | Support scripts | Job scripts, Make files, Utilities |
| src/ | Source code | Source files .F, .F90, *.h |
| tiegcmrun/ | TIEGCM User Interface | Python program for pre-processes, build routines and job execution |
For a brief set of instructions to build the model and make a short default run, see documentation.
Please also see the main TGCM website: TGCM Website
Additional data may be available on the HAO public FTP site: HAO Public FTP Site
User's Guide, Model Description, and Release documentation are available from the on TIEGCM ReadtheDocs.
For any questions or further information, please contact the discussion group email list at tgcmgroup@ucar.edu.
This is a summary of modifications made to the TIEGCM since the release of TIEGCM 2.0 (March 2016).
The job script is modified to support arbitrary combinations of horizontal and vertical resolutions. Changes to magnetic grids are also supported.
Job script, defs.h, and initialization of some altitude-dependent variables (xfac, ar_glbm, aureff, bdriz) are rewritten to support the extension of the upper boundary.
Model time for input/output is set to 4 digits (day/hour/minute/second) instead of the old 3-digit format (day/hour/minute) to allow higher cadence.
The calculation of N2 mixing ratio, mean molecular mass, and scale height is unified to avoid recalculations. Some artificial caps on N2 mixing ratio are removed.
The Helium module is rewritten and now included with all resolutions (default on). In addition, Helium effects on heating rates, etc., are now accounted correctly throughout the code.
The old Fourier filter is replaced with a new ring filter.
An additional input parameter NSTEP_SUB is introduced to control the number of O+ sub-cycling.
NetCDF4 parallel IO is enabled to reduce memory usage on the root task.
ESMF calls are modified to ensure bit-for-bit reproducibility.
The geomagnetic field is updated to the latest International Geomagnetic Reference Field version.
The magnetospheric coupling module is rewritten to support in-memory MPI data transfer.
Unused parameters, arguments, and variables are removed from some functions to simplify the code.
Some MPI subroutines are rewritten for a speed boost.
Dipmin is set to sin(dlat2dtr) instead of being manually set for different resolutions.
Various minor bug fixes.
Modified coefficients of solar heating (Astrid Maute).
A scaling factor is added to account for the height variation of the equatorward electric field (elam) (Astrid Maute).
Field-aligned ion drag is included in the momentum equation (Jiuhou Lei).
In lamdas.F, collision frequency calculation now include all ion species (O+, O2+, N+, N2+ and NO+) instead of only accounting for O+, O2+, and NO+ in previous versions (Haonan Wu).
Minor species solver now includes N(2D) which was assumed in (photo)-chemical equilibrium, this affects N chemistry at very high altitudes (z>7) (Haonan Wu).
The parameterization scheme of electron heat flux (fed) near the equator is changed in settei (Tong Dang, Wenbin Wang, Kevin Pham).
The parameterization scheme of O+ (opflux) near the equator is changed in oplus (Haonan Wu, Wenbin Wang)
A sixth-order polynomial is used for thermal electron heating efficiency (Yihui Cai).
Electrojet turbulent heating is included, default off (Jing Liu).
Empirical SAPS is included, default off (Wenbin Wang).
Support for eclipse solar EUV masking is added (Tong Dang, Jiuhou Lei).
Support for lower boundary forcing by external data (SD nudging) (Haonan Wu, Xian Lu).
Tiegcmrun is a Python tool (/tiegcmrun directory) that is used to compile and execute tiegcm in an automated fashion. Tiegcmrun can be executed interactively on the command line. See example of usage under QuickStart.
Tiegcmpy is a Python tool (Tiegcmpy github) that is used for post processing and data visualization of TIEGCM outputs. Tiegcmpy can be executed interactively on the command line or as an API in a python script. See example of usage TIEGCMpy Docs.