1. SVN tag tiegcm1.92_r325 has been saved as an interim code to tiegcm1.93 We propose that this revision be tested and evaluated over a 2-week period, during which code modifications can be suggested, and after which tiegcm1.93 will be released. See http://download.hao.ucar.edu/pub/tgcm/tiegcm1.92_r325http://download.hao.ucar.edu/pub/tgcm/tiegcm1.92_r325 for more information.

2. Notes on SVN tag tiegcm1.92_r325 New lower boundary coding scheme (module lbc.F) New lower boundary option to use SABER/TIDI data (not released) New namelist read parameter Kp (see flow diagram) Increase night-time electron densities (qinite.F) Bug fix in Weimer05 (wei05sc.F) Change calculation of sun’s location from dipole to apex Update IGRF coefficients with IGRF11 (apex_subs.F) Use collective function mpi_bcast (mp_updatephi) Option to write 4-byte secondary history files Script changes to enable MPI runs on HAO 64-bit systems Several minor bug fixes See http://download.hao.ucar.edu/pub/tgcm/tiegcm1.92_r325http://download.hao.ucar.edu/pub/tgcm/tiegcm1.92_r325 for more information.

3. Steps to run tiegcm1.92_r325 on 64-bit HAO Linux (e.g., arc.hao.ucar.edu): cd to empty working directory, e.g., /hao/arc1/user/tiegcm svn checkout $SVN/tiegcm/tags/tiegcm1.92_r325 where SVN = file:///home/tgcm/svn (see ~foster/.cshrc)file:///home/tgcm/svn cp tiegcm1.92_r325/scripts/tiegcm-linux.job. Edit tiegcm-linux.job as follows to make 8-proc run: set model = tiegcm1.92_r325 set wrkdir =. set tgcmroot =. set mpi = true set nproc = 8 tiegcm-linux.job >&! tiegcm-linux.out & The last command will build and execute the model in tiegcm1.92_r325-linux Script output will appear in tiegcm-linux.out stdout will be tiegcm1.92_r325.out

4. Steps to run tiegcm1.92_r325 on ibm bluefire: cd to empty working directory, e.g., /ptmp/user/tiegcm svn checkout $SVN/tiegcm/tags/tiegcm1.92_r325 where SVN = svn+ssh://arc.hao.ucar.edu/home/tgcm/svn (see ~foster/.cshrc) cp tiegcm1.92_r325/scripts/tiegcm-ibm.job. Edit tiegcm-ibm.job as follows: set model = tiegcm1.92_r325 set wrkdir =. set tgcmroot =. bsub < tiegcm-ibm.job The last command will submit a job to build and execute in tiegcm1.92_r325-aix Script output will appear in tiegcm.xxxxxx.out stdout will be sorted per mpi task in files tiegcm1.92_r325_task*.out

5. Changes from tiegcm1.92_r325 tag toward a tiegcm1.93 release are made on the SVN trunk: To checkout the tiegcm trunk, use the following command: svn checkout $SVN/tiegcm/trunk tiegcm_trunk When changes are made to the trunk, you can update your working directory with the command “svn update”, followed by recompile. Changes made to the trunk since the r325 tag was saved (5/4/10): Minor changes to accommodate non-mpi runs under AIX Check for leap-year at end of calendar year (run to day 367) Add env vars for MPI/PGI build in tiegcm-linux.job

6. Model components to be evaluated prior to releases of TIEGCM: Dynamics: TN, UN, VN, Z Composition: O2, O Minor species Ionosphere: Ne, Te, Ti, ions Aurora Electrodynamics: ExB drifts, apex coords dynamo Data/Empirical Model Assimilation: GPI (Kp, f107) Heelis convection (high-lat) Weimer convection (high-lat) SEE data SABER/TIDI data (U,V,Z lbc) Software: Performance analysis Code structure Documentation Source code revision control

7. Potential Model HeelisWeimer05 IMF DataUser Specified GPI Data User Specified Kp Namelist Input: Kp Power= f(Kp) Ctpoten=f(Kp) bx,by,bz swden,swvel Namelist Input: bx,by,bz swden,swvel Namelist Input: power,ctpoten High-Latitude Input Options in tiegcm1.92_r325 Power= f(Kp) Ctpoten=f(Kp) Power=f(bz,swvel) Ctpoten=f( Weimer phihm  Power=f(bz,swvel) Ctpoten=f(Weimer phihm  Aurora Default This diagram shows input options specifying the potential model to be used for high-latitude ion convection, and options for input or calculation of cross-tail potential and hemispheric power, which drive the auroral parameterization. See notes on the following pages.

8. Notes: 1.Potential models output high-latitude electric potential, which is used to calculate ion drift velocities. 2.IMF data is optionally used to drive the Weimer potential model. 3.GPI Kp data is optionally used to calculate ctpoten and power, which drive the auroral parameterization. 4.GPI f10.7 solar flux data is optionally used to calculate heating and ionization rates (not shown in diagram) Notes and restrictions on namelist inputs: 1.Heelis and Weimer potential models are mutually exclusive. 2.If GPI or IMF data are requested, user can still override with namelist, but must NOT provide at least one parameter. Data will be used for parameter(s) not provided by the user. 3.If missing data is encountered in data files, the program will stop with an error message. 4.GPI data cannot be used in a Weimer run, and IMF data cannot be used in a Heelis run. 5.User cannot provide Kp in a Weimer run (data or no data) 6.If Kp is provided, at least one of ctpoten and power must NOT be provided. Namelist Input Parameters (“User Specified” and “Namelist Input” in the diagram): (Several of these are optional, see notes and restrictions) (ctpoten, power, kp, bximf,byimf,bzimf, swvel, swden may be constants or time-dependent) potential_model= [‘HEELIS’ or ‘WEIMER’] imf_ncfile= [netcdf data file containing bx,by,bz,swden,swvel] gpi_ncfile= [netcdf data file containing Kp, f10.7] ctpoten= [cross-cap potential drop (Kv)] power= [hemispheric power (GW)] f10.7d= [Daily f10.7 cm flux] f10.7a= [Average f10.7 cm flux] kp= [Kp index] bximf,byimf,bzimf= [components of IMF (on separate lines) swvel, swden= [solar wind velocity and density (on separate lines)

9. Functions: Power=f(Kp): Function hp_from_kp (util.F) If (kp <= 7) hp = 16.82*exp(0.32*kp)-4.86 If (kp > 7) hp = 153.13+(kp-7)/(9-7)*(300-153.13) Ctpoten=f(Kp) Function ctpoten_from_kp (util.F) ctpoten = 15+15*kp+0.8*kp**2 Power=f(bz,swvel): Function hp_from_bz_swvel (util.F) fac = 2.0 If (bz < 0) hp = 6+3.3*abs(bz)+(0.05+0.003*abs(bz))*(min(swvel,700)-300) If (bz >= 0) hp = 5.0+0.05*(min(swvel,700)-300) hp = max(2.5,hp)*fac Ctpoten=f(Weimer phihm) (wei05sc.F): weictpoten(ih) = 0.001*(vnx(ih,2)-vnx(ih,1)) ctpoten = 0.5*(weictpoten(1)+weictpoten(2))