I have transferred background-corrected files for Dec. 31, 1993 and Jan. 1,
1994 to jasper, in the /jasper/cnsr3_data1/save directory.  These are the two
days during the 1993-94 winter when Abas Sivjee's MI observed the largest-
amplitude oscillations in the OH intensity and temperature.  I thought they 
would make a good test case for the PoCa images.

Fortunately or otherwise, PoCa was in a mode for unattended operation, and only
one pair of OH images was taken each hour (along with a background image). 
Thus there is not very good time resolution, but on the other hand there is 
less data to wade through for this test case.

In order to view the images and extract zenith brightnesses over the filter 
passbands, you can run the IDL program SHOWRAY.PRO.  I have given instructions 
on its use below.  I hope they are adequate.  Please call/e-mail if you have
any questions.

To convert the image brightnesses to actual R-/Q-branch brightnesses we need to
apply information about the filter passbands.  I have that information here but
have not folded it into the SHOWRAY program yet.  I can tackle it if it seems 
worthwhile when you're here.

To convert R-/Q-branch brightness ratios to OH temperatures is yet another task
I haven't gotten to.  I have done some crude modelling that may be illustrative
but nothing definitive.

Instructions on using SHOWRAY.PRO

% rlogin jasper -l cnsr3
(check your notes for the password or call me at (306) 966-6447)

% idl

IDL> .run showray
(The program responds with the following text:)
Num   Cam0 Filters            Cam1 Filters
0     829 nm                  835 nm                  
1     608 nm                  820 nm                  
2     630.0 nm                785 nm                  
3     668 nm                  557.7 nm                
4     520.0 nm                714 nm                  
Enter the year, month, day, camera, and filter desired:

(Select cam 0 / filter 0 or cam 1 / filter 0 for the OH channels.)

Enter the hour, minute, and second to start (default 00:00:00 UT): 

(Enter 0 0 0 to see the whole day.)

...

Make a PostScript plot file? (Y/[N]) 

(Hit <Return> for now; later you may want to make hard copy.)

Save zenith brightnesses to a text file? (Y/[N]) 

(Type Y<Return>)

Enter the maximum zenith angle to include: 

(I suggest 10 (deg) for now.)

...

Exposure times range from  0.0 to 60.0 s
Enter the exposure time of interest (<Return> for all): 

(Type 60<Return>)

Apply a van Rhijn correction? (Y/[N]) 

(Hit <Return>)

Half-angle field of view includes 1605 pixels.
Enter desired colour table (default=0): 

(Type 0<Return>)

If you want to assign the top of the color bar to a fixed number of counts,
enter that number now, otherwise enter anything else for auto-scaling.
:

(I suggest 750 R full-scale; type 750<Return>)

Plot brightnesses logarithmically? (Y/[N]) 

(No need for this; hit <Return>)

At this point the program will start to display images.  A dot (.) is printed 
for each image displayed, and a pipe (|) for each screenful.  The program waits
for input from you before displaying each new image, so you can control the 
display rate and view as long as you want before going on.

To display each new image, press the space bar.
To interrupt the display of images and restart the display program from a
different time or image number, type 'q' (just the letter, not the apostrophes)
and the program will prompt you for either an image number or a time (hour, 
minute, second).
To abort the program, type 'q' and <Return> or type 'x'.

If you have selected the option of saving zenith brightnesses to a text file,
the program will tell you the name of the text file created before exiting.

If you want to make hard copy of the images, type 'y' when the program asks 
about making a PostScript plot file.  I suggest making a B/W file.