CORHEL is a C shell script that obtains and processes photospheric magnetogram
to run the solar corona model and then processes the result to run the helio-
spheric model.

System requirements:
1. 32-bit Intel Pentium processor.     | 32-bit PowerPC processor.
2. RedHat Linux version 2.0.           | Macintosh OS X 10.3 and 10.4.
3. 1GB of RAM.                         | 512MB of RAM.
4. 350 MB of available hard drive space.
5. Able to run 'wget' command.

Procedures:
1. Copy the CORHEL-2.1 directory from the CD.
2. Go into the CORHEL-2.1 directory.
3. Run the program in the Graphical User Interface mode by typing
        "./run_corhel_2.1
   or run the program in the Command Line mode by typing
        "./run_corhel_2.1_batch -cr .. -res .. [-ebmin ..] [-ebmax ..]
         [-epoint ..] [-observ ..] [-tmax ..] [-dtmin ..] [-dtmax ..]
         [-slund ..] [-visc ..] [-rl ..] [-mmmax ..] [-tpltxint ..]
         [-plotlist ..]"

Required arguments:
  -cr       -- Carrington rotation        -- Must be a value > 1624"
  -res      -- Resolution                 -- Must be either 'low' or 'medium'

Optional arguments:
  -ebmin    -- Extrapolation band minimum -- Default value is 0.25
  -ebmax    -- Extrapolation band maximum -- Default value is 0.45
  -epoint   -- Extrapolation points       -- Default value is 0.35
  -observ   -- Observatory name           -- Must be either 'kittpeak' or
                                             'wilcox'. Default value is
                                             'kittpeak'
  -tmax     -- Maximum time               -- Default value is 200
  -dtmin    -- Delta time minimum         -- Default value is 0.005
  -dtmax    -- Delta time maximum         -- Default value is 0.05
  -slund    -- Lundquist number           -- Default value is 1.0e3
  -visc     -- Viscosity                  -- Default value is 0.01
  -rl       -- Outer radial boundary      -- Default value is 29
  -mmmax    -- Maximum mode               -- Must be a value between 0 and 21.
                                             Default value is 9
  -tpltxint -- Output interval            -- Default value is 20
  -plotlist -- Output parameters"
            -- Must be one or more from this list, separated by comma with no
               space in between and no repeated value:
               vr,vt,vp,br,bt,bp,rho,t,p,jr,jt,jp,ar,at,ap

   e.g. "./run_corhel_2.1_batch -cr 1913 -res low" runs CORHEL-2.1 of
         Carrington rotation 1913 in low resolution with all of the
         optional arguments set to its default value.

        "./run_corhel_2.1" runs CORHEL-2.1 in the Graphical User Interface
         mode.

Recompilation procedures:
1. Make sure the required Fortran compiler is installed.
   Macintosh OS X requires a IBM XL Fortran compiler (XLF).
   Linux requires an Intel Fortran compiler (IFC).
2. Make sure the required Fortran compiler is in the pathname.
3. Run the corhel installation script from the command line by typing
        "./install_corhel"

Read the 'UserGuide.pdf' file in the 'doc' directory for more information about
CORHEL.
