NOTES.change_PR14

Change description and rationale
--------------------------------

Add a plot of the GOES 1-8 angstrom X-ray channel to the timeline plot.
This facilitates evaluation of the radiation environment.

Code changes (list affected files and provide code diffs)
---------------------------------------------------------

See: https://github.com/sot/arc/pull/14/files

The new code to download, store, and plot GOES X-ray data was a simple
modification of existing code to do the same for ACE p3 values.

Testing
-------

Ran code in the development environment for several days and saw the
expected plots.  Compared the timeline plot of GOES X-ray rates to the
actual from SWPC and confirmed good agreement. There were no unexpected
outputs in run logs.

Interface impacts
-----------------

No change in interface.

Review
------

Community was notified about development version and there no concerns
raised about the changes.  No external code review due the simple nature
of the changes and the fact that the GOES X-ray rates are not a direct
criteria used in operational decisions.


Deployment plan
---------------

Will be deployed as soon as approved.