TWP/SKYRAD/C1 - IRT affected by rain or shutter

During this time period, the SKYRAD IRT was affected by rain
events.  Water collected on the IRT lens resulting in
elevated and invalid measurement of the sky brightness
temperature.  If the front optic was not dried after a heavy
rain, the data contamination could persist for several days.

The original solution to the problem was to have the local
observers clean the front lens after rains.  In April 1998,
a rain shutter was installed, but it did not become fully 
functional until Aug 9, 1998.

After the rain shutter was installed, the IRT data was
invalid during rain events while the shutter was closed
but ok again immediately after the shutter re-opened.

The configuration of the IRT was changed Oct 19, 2001.
The IRT was mounted such that the field of view is directed
downward at a 30 degree elevation angle and reflected
to the vertical by a front-surfaced, gold-plated mirror.
This configuration prevents rain from directly striking
the lens and collecting in the lens barrel.

Data from 10/96-3/99 were examined and times when the
data are invalid are identified below.  Data from 4/99-10/01
also contain periods of invalid data, but it is left to
the data users to identify those periods and filter the
data according to their needs.

10/12/96 21:00 - 10/14/96 00:00
10/16/96 13:00 - 10/16/96 21:00
10/21/96 04:00 - 10/21/96 23:00
11/09/96 06:00 - 11/09/96 22:00
11/10/96 08:00 - 11/11/96 03:00
11/23/96 17:00 - 11/24/96 03:00
11/25/96 00:00 - 11/25/96 14:00
12/06/96 17:00 - 12/06/96 22:00
12/07/96 01:00 - 12/07/96 06:00
12/11/96 21:00 - 12/11/96 23:00
12/12/96 05:00 - 12/12/96 18:00
12/16/96 03:00 - 12/16/96 23:00
12/19/96 02:00 - 12/20/96 03:00
12/21/96 10:00 - 12/22/96 03:00
12/22/96 20:00 - 12/23/96 07:00
12/27/96 01:00 - 12/27/96 11:00
12/30/96 06:00 - 12/30/96 23:00
01/01/97 21:00 - 01/02/97 01:00
01/10/97 01:00 - 01/10/97 09:00
01/12/97 06:00 - 01/12/97 23:59
01/14/97 01:00 - 01/15/97 23:00
01/17/97 01:00 - 01/17/97 10:00
01/18/97 18:00 - 01/18/97 23:59
01/19/97 17:00 - 01/19/97 23:00
01/20/97 10:00 - 01/21/97 02:00
01/27/97 15:00 - 01/27/97 23:59
01/30/97 16:00 - 01/30/97 23:59
02/01/97 03:00 - 02/01/97 13:00
02/02/97 05:00 - 02/03/97 01:00
02/09/97 00:00 - 02/09/97 03:00
02/10/97 04:00 - 02/11/97 07:00
02/12/97 11:00 - 02/12/97 22:00
02/15/97 00:00 - 02/15/97 03:00
02/16/97 06:00 - 02/16/97 20:00
02/17/97 10:00 - 02/18/97 01:00
02/18/97 04:00 - 02/19/97 23:00
02/24/97 00:00 - 02/24/97 21:00
02/25/97 03:00 - 02/25/97 09:00
02/26/97 01:00 - 02/26/97 07:00
03/01/97 01:00 - 03/01/97 12:00
03/26/97 01:00 - 03/27/97 03:00
04/07/97 13:00 - 04/08/97 02:00
04/11/97 03:00 - 04/11/97 06:00
04/12/97 00:00 - 04/12/97 05:00
04/12/97 12:00 - 04/12/97 18:00
04/15/97 15:00 - 04/15/97 19:00
04/15/97 22:00 - 04/16/97 10:00
04/16/97 12:00 - 04/16/97 23:59
04/22/97 15:00 - 04/22/97 21:00
04/27/97 18:00 - 04/27/97 21:00
04/29/97 13:00 - 04/29/97 20:00
05/01/97 04:00 - 05/01/97 23:00
05/03/97 03:00 - 05/03/97 20:00
05/13/97 13:00 - 05/14/97 23:00
05/16/97 19:00 - 05/16/97 23:59
05/18/97 06:00 - 05/18/97 21:00
05/20/97 02:00 - 05/20/97 21:00
05/22/97 02:00 - 05/22/97 21:00
05/25/97 03:00 - 05/25/97 23:00
05/26/97 04:00 - 05/26/97 11:00
05/27/97 04:00 - 05/27/97 07:00
06/24/97 13:00 - 06/24/97 21:00
06/30/97 19:00 - 07/01/97 06:00
07/04/97 03:00 - 07/04/97 23:59
07/07/97 15:00 - 07/08/97 20:00
07/11/97 13:00 - 07/11/97 21:00
07/12/97 10:00 - 07/12/97 20:00
07/15/97 19:00 - 07/16/97 21:00
07/17/97 18:00 - 07/18/97 05:00
07/18/97 12:00 - 07/19/97 21:00
07/21/97 06:00 - 07/21/97 23:00
08/06/97 21:00 - 08/07/97 07:00
08/07/97 15:00 - 08/07/97 23:00
08/26/97 08:00 - 08/26/97 17:00
09/23/97 20:00 - 09/23/97 21:00
09/25/97 04:00 - 09/25/97 09:00
09/25/97 21:00 - 09/25/97 23:59
10/01/97 03:00 - 10/01/97 06:00
10/12/97 02:00 - 10/12/97 05:00
10/12/97 08:00 - 10/12/97 22:00
10/13/97 06:00 - 10/13/97 17:00
10/22/97 02:00 - 10/22/97 05:00
10/25/97 22:00 - 10/26/97 05:00
10/27/97 07:00 - 10/27/97 23:00
11/02/97 00:00 - 11/02/97 23:59
11/16/97 04:00 - 11/16/97 08:00
11/16/97 18:00 - 11/16/97 22:00
11/18/97 15:00 - 11/18/97 22:00
11/30/97 03:00 - 11/30/97 20:00
12/17/97 18:00 - 12/18/97 23:00
12/21/97 03:00 - 12/21/97 05:00
12/25/97 02:00 - 12/25/97 08:00
12/26/97 18:00 - 12/27/97 01:00
12/28/97 01:00 - 12/28/97 20:00
12/30/97 09:00 - 12/30/97 23:00
01/03/98 04:00 - 01/03/98 05:00
01/04/98 05:00 - 01/05/98 02:00
02/04/98 19:00 - 02/04/98 23:00
02/05/98 04:00 - 02/06/98 19:00
02/07/98 16:00 - 02/08/98 03:00
02/08/98 12:00 - 02/08/98 21:00
02/09/98 06:00 - 02/10/98 04:00
02/20/98 19:00 - 02/20/98 23:59
02/22/98 09:00 - 02/22/98 21:00
03/16/98 00:00 - 03/16/98 02:00
03/17/98 19:00 - 03/17/98 23:59
03/28/98 15:00 - 03/31/98 03:00
03/31/98 10:00 - 03/31/98 22:00
04/01/98 00:00 - 04/01/98 03:18
04/01/98 06:45 - 04/01/98 10:06
04/02/98 00:28 - 04/05/98 03:45
04/05/98 19:25 - 04/05/98 23:54
04/09/98 00:45 - 04/09/98 16:54
04/10/98 15:15 - 04/10/98 19:28
04/11/98 04:24 - 04/11/98 05:34
04/11/98 06:56 - 04/11/98 23:28
04/12/98 00:15 - 04/12/98 01:56
04/12/98 04:15 - 04/12/98 05:37
04/12/98 15:37 - 04/12/98 16:57
04/12/98 17:15 - 04/12/98 21:37
04/13/98 01:37 - 04/13/98 14:45
04/19/98 05:25 - 04/19/98 06:08
04/19/98 20:15 - 04/19/98 22:15
04/21/98 08:57 - 04/22/98 03:45
04/23/98 21:45 - 04/23/98 21:56
04/27/98 17:56 - 04/27/98 22:08
04/28/98 05:45 - 04/28/98 20:36
04/28/98 23:45 - 04/29/98 05:58
04/30/98 10:57 - 04/30/98 21:58
05/01/98 08:08 - 05/02/98 00:08
05/02/98 07:45 - 05/02/98 22:08
05/03/98 08:35 - 05/03/98 22:55
05/04/98 08:16 - 05/04/98 21:55
05/05/98 07:33 - 05/05/98 22:08
05/06/98 07:55 - 05/06/98 22:07
05/07/98 07:55 - 05/07/98 12:33
05/07/98 13:08 - 05/07/98 22:26
05/08/98 02:45 - 05/08/98 03:08
05/08/98 03:34 - 05/08/98 04:16
05/09/98 02:26 - 05/09/98 02:56
05/09/98 20:55 - 05/09/98 21:08
05/09/98 21:45 - 05/09/98 23:35
05/10/98 15:45 - 05/10/98 18:35
05/11/98 22:08 - 05/11/98 22:45
05/12/98 01:34 - 05/12/98 02:26
05/12/98 13:09 - 05/12/98 20:45
05/13/98 00:25 - 05/13/98 04:28
05/13/98 11:15 - 05/13/98 12:57
05/13/98 13:26 - 05/13/98 18:19
05/13/98 19:45 - 05/14/98 22:08
05/16/98 00:15 - 05/16/98 05:15
05/16/98 07:04 - 05/17/98 01:55
05/17/98 05:25 - 05/17/98 06:33
05/19/98 21:16 - 05/19/98 22:16
05/19/98 22:57 - 05/19/98 23:35
05/21/98 16:57 - 05/21/98 21:15
05/21/98 23:56 - 05/22/98 00:45
05/22/98 01:25 - 05/22/98 02:04
05/22/98 19:15 - 05/22/98 21:56
05/23/98 06:25 - 05/23/98 07:07
05/24/98 06:25 - 05/24/98 07:45
05/24/98 10:45 - 05/24/98 21:33
05/25/98 07:57 - 05/25/98 17:26
05/26/98 19:15 - 05/27/98 00:26
05/27/98 04:35 - 05/27/98 12:26
05/29/98 12:05 - 05/29/98 22:15
05/30/98 01:25 - 05/30/98 02:04
06/01/98 15:57 - 06/01/98 21:45
06/02/98 04:15 - 06/02/98 23:34
06/03/98 04:55 - 06/03/98 05:45
06/03/98 07:45 - 06/03/98 11:17
06/03/98 20:58 - 06/03/98 22:58
06/04/98 01:45 - 06/04/98 02:03
06/04/98 07:45 - 06/04/98 09:15
06/04/98 20:29 - 06/04/98 21:15
06/05/98 02:15 - 06/05/98 03:26
06/05/98 05:15 - 06/05/98 13:26
06/05/98 15:26 - 06/06/98 00:05
06/06/98 08:35 - 06/06/98 20:35
06/06/98 21:56 - 06/06/98 22:26
06/07/98 06:45 - 06/07/98 13:45
06/07/98 20:57 - 06/07/98 23:45
06/08/98 00:29 - 06/08/98 01:29
06/08/98 19:29 - 06/08/98 20:58
06/09/98 03:25 - 06/09/98 03:45
06/09/98 06:35 - 06/09/98 06:58
06/09/98 15:42 - 06/09/98 16:58
06/10/98 09:35 - 06/10/98 21:34
06/13/98 02:25 - 06/14/98 03:05
06/13/98 04:45 - 06/13/98 05:26
06/13/98 20:06 - 06/13/98 23:25
06/13/98 23:45 - 06/14/98 00:15
06/14/98 03:25 - 06/14/98 03:45
06/14/98 15:15 - 06/14/98 18:24
06/14/98 20:55 - 06/14/98 21:15
06/16/98 18:34 - 06/16/98 22:36
06/17/98 06:55 - 06/17/98 08:04
06/17/98 09:54 - 06/17/98 10:26
06/18/98 04:26 - 06/18/98 05:05
06/18/98 05:45 - 06/18/98 07:26
06/18/98 12:58 - 06/18/98 13:16
06/18/98 14:15 - 06/18/98 23:56
06/19/98 00:26 - 06/19/98 00:56
06/19/98 02:15 - 06/19/98 03:04
06/19/98 03:25 - 06/19/98 06:56
06/19/98 07:25 - 06/19/98 08:56
06/19/98 11:45 - 06/20/98 13:46
06/20/98 16:29 - 06/20/98 20:45
06/20/98 23:58 - 06/21/98 01:15
06/22/98 03:45 - 06/22/98 04:34
06/22/98 05:45 - 06/22/98 16:34
06/22/98 19:45 - 06/23/98 01:05
06/23/98 02:04 - 06/23/98 02:55
06/23/98 03:45 - 06/23/98 05:05
06/23/98 05:45 - 06/23/98 07:17
06/23/98 22:06 - 06/24/98 16:25
06/24/98 22:36 - 06/24/98 23:25
06/25/98 00:05 - 06/25/98 00:34
06/27/98 00:55 - 06/27/98 01:16
06/27/98 05:45 - 06/27/98 06:05
06/27/98 21:25 - 06/28/98 08:05
06/28/98 12:26 - 06/28/98 13:45
06/30/98 10:58 - 06/30/98 13:05
06/30/98 13:15 - 06/30/98 17:45
06/30/98 18:15 - 06/30/98 21:45
07/01/98 08:26 - 07/01/98 22:05
07/02/98 11:33 - 07/02/98 21:33
07/03/98 17:33 - 07/03/98 21:45
07/04/98 15:57 - 07/04/98 16:45
07/04/98 21:57 - 07/04/98 22:25
07/05/98 07:15 - 07/05/98 22:56
07/05/98 23:05 - 07/06/98 00:05
07/06/98 03:54 - 07/06/98 06:04
07/06/98 07:04 - 07/06/98 10:04
07/06/98 16:45 - 07/06/98 21:15
07/07/98 04:56 - 07/07/98 05:56
07/07/98 06:26 - 07/07/98 06:56
07/07/98 07:45 - 07/07/98 08:34
07/08/98 01:45 - 07/08/98 02:34
07/08/98 02:56 - 07/08/98 03:27
07/08/98 08:26 - 07/08/98 15:08
07/08/98 16:06 - 07/08/98 16:45
07/08/98 17:28 - 07/08/98 19:28
07/09/98 15:55 - 07/09/98 18:03
07/09/98 21:25 - 07/09/98 22:25
07/09/98 23:05 - 07/09/98 23:45
07/10/98 02:25 - 07/10/98 03:58
07/10/98 23:29 - 07/10/98 23:45
07/12/98 09:25 - 07/12/98 09:45
07/12/98 10:25 - 07/12/98 21:15
07/13/98 01:34 - 07/13/98 02:15
07/13/98 04:15 - 07/13/98 04:26
07/13/98 10:15 - 07/13/98 13:57
07/13/98 15:45 - 07/13/98 21:05
07/14/98 02:25 - 07/14/98 02:35
07/14/98 03:15 - 07/14/98 06:25
07/14/98 12:56 - 07/14/98 17:05
07/15/98 03:25 - 07/15/98 05:25
07/15/98 18:15 - 07/15/98 19:55
07/15/98 20:55 - 07/15/98 22:35
07/16/98 03:25 - 07/16/98 06:15
07/16/98 08:35 - 07/16/98 12:15
07/16/98 15:04 - 07/16/98 23:25
07/17/98 10:55 - 07/17/98 13:25
07/19/98 03:35 - 07/19/98 09:15
07/19/98 10:57 - 07/19/98 14:26
07/19/98 15:35 - 07/19/98 18:26
07/19/98 19:55 - 07/19/98 21:15
07/19/98 21:25 - 07/19/98 21:45
07/20/98 01:45 - 07/20/98 02:04
07/20/98 10:15 - 07/20/98 11:45
07/20/98 12:04 - 07/20/98 13:04
07/20/98 16:04 - 07/20/98 22:25
07/20/98 16:05 - 07/20/98 22:25
07/20/98 22:45 - 07/20/98 23:25
07/21/98 01:15 - 07/21/98 01:57
07/21/98 02:34 - 07/21/98 03:45
07/21/98 04:26 - 07/21/98 05:45
07/21/98 06:57 - 07/21/98 07:04
07/21/98 11:45 - 07/21/98 12:35
07/22/98 01:15 - 07/22/98 03:45
07/22/98 05:45 - 07/22/98 22:35
07/22/98 23:35 - 07/23/98 03:15
07/23/98 05:15 - 07/23/98 09:35
07/23/98 17:45 - 07/23/98 19:56
07/23/98 20:45 - 07/23/98 21:56
07/24/98 01:26 - 07/24/98 01:45
07/24/98 04:26 - 07/24/98 04:45
07/24/98 10:15 - 07/24/98 12:15
07/24/98 12:35 - 07/24/98 16:45
07/25/98 07:03 - 07/25/98 13:26
07/26/98 04:25 - 07/26/98 04:45
07/26/98 13:57 - 07/26/98 18:15
07/27/98 09:45 - 07/27/98 09:58
07/27/98 12:05 - 07/28/98 10:25
07/28/98 23:26 - 07/29/98 00:05
07/29/98 00:45 - 07/29/98 01:08
07/29/98 04:58 - 07/29/98 05:26
07/29/98 06:05 - 07/29/98 07:45
07/29/98 16:57 - 07/29/98 18:35
07/30/98 02:45 - 07/30/98 03:45
07/30/98 19:57 - 07/31/98 00:24
07/31/98 07:15 - 07/31/98 08:35
07/31/98 09:04 - 07/31/98 09:45
07/31/98 12:25 - 07/31/98 13:45
08/01/98 00:00 - 08/01/98 00:15
08/01/98 03:15 - 08/01/98 23:05
08/04/98 15:56 - 08/04/98 16:45
08/05/98 06:56 - 08/05/98 07:45
08/06/98 06:45 - 08/06/98 07:15
08/06/98 14:45 - 08/06/98 17:04
08/07/98 05:33 - 08/07/98 07:33
08/09/98 04:15 - 08/09/98 05:33
08/09/98 07:33 - 08/09/98 07:56
08/10/98 19:57 - 08/10/98 21:35
08/11/98 10:04 - 08/11/98 10:15
08/12/98 08:04 - 08/12/98 09:55
08/13/98 16:15 - 08/13/98 16:45
08/14/98 22:04 - 08/14/98 22:15
08/15/98 02:04 - 08/15/98 02:55
08/15/98 04:15 - 08/15/98 04:45
08/15/98 05:25 - 08/15/98 05:45
08/15/98 15:35 - 08/15/98 15:45
08/18/98 07:15 - 08/18/98 07:35
08/18/98 09:15 - 08/18/98 10:27
08/18/98 14:45 - 08/18/98 17:05
08/19/98 15:54 - 08/20/98 10:15
08/27/98 22:10 - 08/28/98 00:45
08/28/98 04:05 - 08/28/98 05:25
09/02/98 05:05 - 09/02/98 05:15
09/03/98 03:15 - 09/03/98 03:25
09/03/98 10:55 - 09/03/98 11:04
09/05/98 20:04 - 09/05/98 21:35
09/07/98 09:45 - 09/07/98 10:05
09/07/98 21:45 - 09/07/98 22:15
09/09/98 05:04 - 09/09/98 06:04
09/09/98 07:35 - 09/09/98 08:45
09/09/98 20:57 - 09/10/98 00:33
09/10/98 06:15 - 09/10/98 07:04
09/10/98 13:55 - 09/10/98 14:24
09/12/98 14:34 - 09/12/98 15:15
09/12/98 17:05 - 09/12/98 17:35
09/13/98 16:55 - 09/13/98 17:04
09/14/98 06:04 - 09/14/98 06:25
09/15/98 08:55 - 09/15/98 09:15
09/15/98 19:45 - 09/15/98 20:55
09/17/98 01:35 - 09/17/98 03:15
09/17/98 08:15 - 09/17/98 09:04
09/17/98 12:55 - 09/17/98 14:04
09/17/98 21:55 - 09/17/98 23:24
09/18/98 11:15 - 09/18/98 12:55
09/18/98 14:45 - 09/18/98 16:55
09/21/98 03:34 - 09/21/98 06:45
09/21/98 15:56 - 09/21/98 16:45
09/21/98 19:04 - 09/22/98 20:55
09/22/98 22:25 - 09/22/98 23:24
09/23/98 03:56 - 09/23/98 05:15
09/23/98 16:04 - 09/23/98 17:15
09/23/98 20:55 - 09/24/98 01:25
09/24/98 02:55 - 09/24/98 03:35
09/24/98 04:25 - 09/24/98 05:56
09/26/98 02:15 - 09/26/98 03:35
09/26/98 08:15 - 09/26/98 08:35
09/26/98 08:45 - 09/26/98 13:24
09/27/98 13:05 - 09/27/98 13:24
09/28/98 03:26 - 09/28/98 03:55
09/29/98 05:45 - 09/29/98 06:15
09/29/98 11:04 - 09/29/98 11:55
09/29/98 19:34 - 09/29/98 21:25
09/30/98 00:05 - 09/30/98 03:15
09/30/98 14:35 - 10/01/98 13:24
10/01/98 14:45 - 10/01/98 16:25
10/02/98 20:45 - 10/02/98 21:35
10/04/98 00:15 - 10/04/98 01:15
10/04/98 02:25 - 10/04/98 08:35
10/05/98 13:15 - 10/05/98 16:57
10/06/98 16:45 - 10/06/98 18:57
10/06/98 21:45 - 10/06/98 22:57
10/08/98 02:15 - 10/08/98 02:45
10/09/98 19:04 - 10/09/98 20:15
10/13/98 01:55 - 10/13/98 03:15
10/15/98 05:55 - 10/15/98 06:35
10/16/98 04:04 - 10/16/98 04:35
10/16/98 22:36 - 10/17/98 00:45
10/17/98 07:24 - 10/17/98 09:15
10/19/98 10:55 - 10/19/98 11:15
10/20/98 03:15 - 10/20/98 04:25
10/23/98 14:45 - 10/23/98 15:15
10/24/98 18:25 - 10/24/98 18:45
10/25/98 00:36 - 10/25/98 00:57
10/25/98 05:15 - 10/25/98 05:24
10/28/98 08:05 - 10/28/98 15:25
10/29/98 06:05 - 10/29/98 06:35
10/29/98 16:15 - 10/29/98 16:55
10/29/98 20:35 - 10/29/98 21:15
10/31/98 11:45 - 10/31/98 15:24
11/01/98 21:35 - 11/01/98 21:45
11/04/98 09:57 - 11/04/98 10:57
11/04/98 11:15 - 11/04/98 12:26
11/05/98 02:34 - 11/05/98 06:00
11/05/98 16:05 - 11/06/98 00:30
11/07/98 11:15 - 11/07/98 11:35
11/07/98 19:24 - 11/07/98 19:57
11/08/98 04:04 - 11/08/98 04:45
11/10/98 02:45 - 11/10/98 03:00
11/10/98 05:00 - 11/10/98 05:30
11/16/98 04:35 - 11/16/98 06:45
11/17/98 01:05 - 11/17/98 06:35
11/17/98 23:24 - 11/18/98 00:45
11/18/98 03:06 - 11/18/98 03:30
11/19/98 00:45 - 11/19/98 01:15
11/19/98 02:04 - 11/19/98 05:36
11/19/98 15:35 - 11/19/98 16:35
11/20/98 00:35 - 11/21/98 01:57
11/21/98 03:24 - 11/21/98 09:05
11/21/98 22:54 - 11/22/98 00:45
11/22/98 23:45 - 11/23/98 02:05
11/23/98 04:54 - 11/23/98 09:00
11/24/98 03:15 - 11/24/98 04:15
11/27/98 07:45 - 11/27/98 08:35
11/28/98 06:24 - 11/28/98 07:15
11/29/98 02:45 - 11/29/98 07:55
11/30/98 20:45 - 11/30/98 21:45
12/01/98 03:35 - 12/01/98 04:15
12/01/98 14:55 - 12/01/98 22:45
12/02/98 02:35 - 12/02/98 13:05
12/02/98 21:15 - 12/02/98 22:15
12/03/98 00:24 - 12/04/98 00:45
12/04/98 06:15 - 12/04/98 06:57
12/04/98 23:55 - 12/05/98 00:45
12/05/98 11:35 - 12/05/98 12:35
12/05/98 16:25 - 12/05/98 17:35
12/05/98 19:15 - 12/06/98 17:35
12/06/98 22:35 - 12/07/98 09:25
12/07/98 12:05 - 12/07/98 13:35
12/07/98 21:45 - 12/08/98 01:15
12/09/98 00:25 - 12/09/98 00:55
12/10/98 02:45 - 12/10/98 04:15
12/11/98 02:55 - 12/11/98 05:36
12/11/98 17:35 - 12/11/98 17:55
12/12/98 00:25 - 12/12/98 17:25
12/12/98 20:05 - 12/12/98 20:56
12/12/98 22:55 - 12/12/98 23:25
12/13/98 00:15 - 12/13/98 00:35
12/13/98 01:35 - 12/13/98 04:25
12/13/98 20:24 - 12/14/98 08:45
12/14/98 14:24 - 12/15/98 21:54
12/17/98 05:35 - 12/17/98 05:45
12/21/98 06:35 - 12/21/98 07:24
12/23/98 17:35 - 12/23/98 18:35
12/24/98 18:25 - 12/24/98 18:45
12/25/98 01:45 - 12/25/98 02:25
12/25/98 04:35 - 12/25/98 14:15
12/25/98 19:15 - 12/25/98 19:55
12/26/98 01:55 - 12/26/98 06:45
12/26/98 17:45 - 12/26/98 18:15
12/27/98 16:15 - 12/27/98 16:35
12/27/98 17:55 - 12/27/98 20:55
12/28/98 13:15 - 12/28/98 13:55
12/28/98 18:15 - 12/28/98 20:55
12/29/98 05:15 - 12/29/98 06:04
12/30/98 03:24 - 12/30/98 05:55
12/30/98 07:15 - 12/30/98 09:15
12/31/98 02:30 - 12/31/98 23:59
01/01/99 00:05 - 01/01/99 01:56
01/01/99 10:15 - 01/01/99 10:45
01/01/99 21:35 - 01/01/99 22:45
01/02/99 00:07 - 01/02/99 00:35
01/02/99 03:35 - 01/02/99 10:25
01/02/99 17:05 - 01/02/99 20:15
01/03/99 08:35 - 01/03/99 08:45
01/03/99 10:24 - 01/03/99 11:04
01/03/99 12:55 - 01/03/99 14:35
01/04/99 13:24 - 01/04/99 13:57
01/05/99 04:45 - 01/05/99 05:05
01/07/99 07:45 - 01/07/99 08:04
01/09/99 21:55 - 01/09/99 22:15
01/10/99 04:15 - 01/10/99 06:35
01/10/99 07:25 - 01/10/99 07:35
01/10/99 08:05 - 01/10/99 08:15
01/15/99 09:15 - 01/15/99 09:24
01/15/99 14:45 - 01/15/99 15:45
01/16/99 04:55 - 01/16/99 06:05
01/18/99 05:55 - 01/18/99 07:15
01/18/99 17:15 - 01/18/99 17:35
01/18/99 20:05 - 01/18/99 20:15
01/19/99 05:03 - 01/19/99 05:15
01/19/99 13:45 - 01/19/99 13:55
01/19/99 15:24 - 01/19/99 15:34
01/19/99 17:05 - 01/19/99 17:45
01/19/99 20:35 - 01/19/99 22:35
01/20/99 03:05 - 01/20/99 03:24
01/20/99 03:55 - 01/20/99 19:45
01/21/99 05:55 - 01/21/99 10:35
01/21/99 14:45 - 01/21/99 17:55
01/21/99 19:35 - 01/21/99 21:15
01/21/99 22:57 - 01/22/99 18:45
01/22/99 22:45 - 01/23/99 00:04
01/23/99 02:24 - 01/23/99 04:45
01/23/99 05:15 - 01/23/99 06:05
01/24/99 13:45 - 01/24/99 15:15
01/25/99 17:24 - 01/25/99 18:24
01/25/99 23:45 - 01/26/99 00:15
01/29/99 22:56 - 01/29/99 23:15
01/30/99 07:04 - 01/30/99 07:45
01/30/99 16:35 - 01/30/99 16:45
01/30/99 19:55 - 01/30/99 23:15
01/31/99 00:55 - 01/31/99 01:35
01/31/99 02:55 - 01/31/99 03:24
01/31/99 06:55 - 01/31/99 08:24
01/31/99 15:55 - 01/31/99 16:15
01/31/99 17:55 - 01/31/99 18:25
01/31/99 21:35 - 02/01/99 05:25
02/01/99 13:15 - 02/01/99 13:55
02/01/99 18:45 - 02/01/99 19:04
02/03/99 03:34 - 02/03/99 04:55
02/03/99 08:24 - 02/03/99 08:45
02/03/99 16:55 - 02/03/99 21:45
02/03/99 23:45 - 02/04/99 03:15
02/04/99 15:15 - 02/04/99 15:24
02/04/99 21:55 - 02/05/99 15:55
02/06/99 14:45 - 02/06/99 15:15
02/07/99 02:15 - 02/07/99 02:35
02/08/99 09:24 - 02/08/99 17:15
02/08/99 22:05 - 02/09/99 13:45
02/09/99 19:05 - 02/09/99 19:35
02/10/99 03:05 - 02/10/99 07:05
02/12/99 00:25 - 02/12/99 04:05
02/13/99 20:55 - 02/14/99 09:15
02/14/99 22:05 - 02/14/99 22:45
02/14/99 23:25 - 02/14/99 23:45
02/15/99 04:55 - 02/15/99 05:25
02/15/99 08:45 - 02/16/99 04:05
02/17/99 15:45 - 02/17/99 16:24
02/18/99 01:05 - 02/18/99 01:15
02/18/99 02:15 - 02/18/99 02:25
02/20/99 06:55 - 02/20/99 07:15
02/20/99 22:55 - 02/20/99 23:25
02/21/99 03:24 - 02/21/99 04:05
02/21/99 15:24 - 02/21/99 17:05
02/21/99 19:05 - 02/21/99 20:24
02/21/99 21:55 - 02/21/99 22:35
02/22/99 00:45 - 02/22/99 01:45
02/22/99 05:55 - 02/22/99 07:15
02/22/99 11:45 - 02/22/99 12:15
02/22/99 13:35 - 02/22/99 13:55
02/22/99 14:24 - 02/22/99 14:45
02/24/99 07:35 - 02/24/99 07:45
02/24/99 16:56 - 02/25/99 05:55
02/25/99 22:45 - 02/25/99 23:55
02/26/99 02:15 - 02/26/99 03:04
02/26/99 04:45 - 02/26/99 05:15
03/01/99 23:45 - 03/02/99 00:55
03/02/99 04:45 - 03/02/99 04:55
03/03/99 01:35 - 03/03/99 02:15
03/03/99 11:35 - 03/03/99 13:15
03/03/99 14:45 - 03/03/99 16:45
03/03/99 21:05 - 03/03/99 21:15
03/05/99 16:45 - 03/05/99 17:05
03/05/99 19:35 - 03/06/99 01:55
03/06/99 10:15 - 03/06/99 10:25
03/06/99 14:24 - 03/06/99 14:45
03/07/99 02:55 - 03/07/99 03:24
03/07/99 03:35 - 03/07/99 05:35
03/07/99 16:45 - 03/07/99 18:45
03/07/99 22:45 - 03/07/99 23:05
03/10/99 00:55 - 03/10/99 01:45
03/10/99 02:35 - 03/10/99 02:55
03/10/99 04:15 - 03/10/99 09:15
03/11/99 02:25 - 03/11/99 02:35
03/12/99 02:25 - 03/12/99 02:35
03/13/99 02:25 - 03/13/99 02:35
03/14/99 02:25 - 03/14/99 02:35
03/15/99 02:25 - 03/15/99 02:35
03/15/99 03:45 - 03/15/99 04:04
03/17/99 13:55 - 03/17/99 14:35
03/17/99 20:15 - 03/17/99 20:35
03/20/99 04:15 - 03/20/99 04:24
03/20/99 05:04 - 03/20/99 05:24
03/20/99 19:45 - 03/20/99 20:25
03/20/99 23:35 - 03/21/99 00:15
03/23/99 10:35 - 03/23/99 11:15
03/25/99 23:15 - 03/25/99 23:55
03/26/99 13:55 - 03/26/99 14:15
03/27/99 18:45 - 03/27/99 20:15
03/28/99 16:15 - 03/28/99 18:06
03/28/99 22:55 - 03/28/99 23:15
03/30/99 02:35 - 03/30/99 02:55
03/31/99 19:45 - 03/31/99 20:35

• Sky Infra Red Temperature Minima(sky_ir_temp_min)
• Sky Infra Red Temperature Maxima(sky_ir_temp_max)
• Sky Infra-Red Temperature(sky_ir_temp)
• Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)

TWP/SKYRAD/C1 - PIR identified as shaded2 is really an unshaded instrument

On Oct 24, 2001, the Global PIR was moved from the unshaded position on the SKYRAD stand 
to a shaded position on the new K&Z tracker.  The data for all time are named "shaded2" 
indicating that this PIR was ALWAYS shaded.  From 19961010 to 20011024, this was not the 
case.

• Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Pyrgeometer2(inst_down_long_hemisp2_case_temp)
• Downwelling Longwave Hemispheric Irradiance, Pyrgeometer2, Minima(down_long_hemisp2_min)
• Downwelling Longwave Hemispheric Irradiance, Pyrgeometer2(down_long_hemisp2)
• Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Pyrgeometer2(inst_down_long_hemisp2_dome_temp)
• Downwelling Longwave Hemispheric Irradiance, Pyrgeometer2, Standard Deviation(down_long_hemisp2_std)
• Instantaneous Downwelling Pyrgeometer Thermopile, Pyrgeometer2(inst_down_long_hemisp2_tp)
• Downwelling Longwave Hemispheric Irradiance, Pyrgeometer2, Maxima(down_long_hemisp2_max)

TWP/SKYRAD/C1  - IRT failure

A moisture related fault was found in the IRT cable after a day of very heavy rain. The 
cable was replaced but the internal power supply was apparently damaged. The instrument was 
replaced with a spare IRT.

• Sky Infra Red Temperature Minima(sky_ir_temp_min)
• Sky Infra Red Temperature Maxima(sky_ir_temp_max)
• Sky Infra-Red Temperature(sky_ir_temp)
• Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)

TWP/SKYRAD/C1 - Failed PSP ventilator fan

On 1/31 the ventilator for the PSP measuring downwelling_shortwave_hemispheric irradiance 
failed.  The DQ effect of this failure on the measurement of down_short_hemisp is not 
possible to fully quantify but it has been noted that during these failures the PSP 
nighttime values can be several (1-3W/m2) smaller than usual.  Another effect is slower thermal 
response (1hr) of the PSP instrument due to daytime heating and cooling of the ventilator 
housing.

• Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
  Voltage(inst_global)

• Down-welling unshaded pyranometer voltage(down_short_hemisp)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
  Deviation(down_short_hemisp_std)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)

TWP/SKYRAD/C1 - Tracker Failure

The solar tracker at C1 failed to wake up the morning of 6/10 approximately 2000GMT. Ops 
discovered problem and reset tracker 6/12 approximately 0800GMT.

Tracker dependent instrument data is inaccurate - this includes the short_direct (NIP) and 
down_short_diffuse_hemisp (8-48). The down_short_hemisp (PSP) and down_long_hemisp (PIR) 
are unaffected.

• Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
  Voltage(inst_direct_normal)
• Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
  Thermopile Voltage(inst_diffuse)

• Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
• Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(down_short_diffuse_hemisp_max)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Minima(down_short_diffuse_hemisp_min)
• Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
• Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)
• Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)