This package contains a climatological model of the JULIA vertical
plasma drifts. It is a model of three parameters: local time,
season, and EUVAC. Included in the package are the coefficents
for the mean model and standard deviation model, along with
source code required to plot one dimensional slices of the model
for any desired parameter.

To compile source code under Unix:
==================================

The GNU Scientific Library (v1.9) is required for compiling this source
code. See http://www.gnu.org/software/gsl/

Once GSL is installed, simply typing 'make' will compile
all files and create the executable "drift_plot". This program
can be used to generate 1D plots of the drift model for any
choice of parameters with any of the four parameters as the plotting
variable.

Execute drift_plot -h to find out all the command line options for
how to specify parameter values.

Notes regarding using the source routines in your own work
==========================================================

The important source code files you'd need to include in your
own work are:

drift_calc.c   - contains routines for computing the vertical drift mean and
                 standard deviation

drift_basis.c  - contains the basis functions for each parameter
                 in the model

drift_plot.c   - this is an independent driver program which will
                 demonstrate how to call the routines in drift_calc.c

other          - the other source files contain various computational
                 routines needed by the model

Patrick Alken
patrick.alken@noaa.gov
