***** Yohkoh/SXT data gaps *****

Following periods are known as data gaps longer than 24 hours, 
during which no observation was made or only scarcely made.

0) 03-Sep-91 00:00 to 02-Oct-91 08:27
Initial operation phase. Observations were made under a test mode
(high CCD temperature). Frequent data gaps.

1) 12-Oct-91 12:00 to 17-Oct-91 00:00
Scientific operation curtailed to permit on-orbit adjustment of 
the Yohkoh attitude control system.

2) 20-Dec-91 20:00 to 22-Dec-91 21:00
No observation due to SXT error and recovery.

3) 28-Dec-91 18:40 to 04-Jan-91 12:00
No observation for year-end/new-year holidays at the Kagoshima station.

4) 01-Feb-92 02:00 to 03-Feb-92 02:00
No observation due to SXT error and recovery.

5) 21-Mar-92 09:15 to 23-Mar-92 02:00
No observation due to SXT error and recovery.

6) 04-Sep-93 09:30 to 07-Sep-93 09:30
No Kagoshima operation due to antenna trouble.

7) 23-Nov-93 20:35 to 26-Nov-93 01:50
No Kagoshima operation due to antenna trouble.

8) 04-Dec-93 00:00 to 05-Dec-93 09:30
Kagoshima operation holiday. DSN stations(for data download)
cancelled for supporting a Space Shuttle launch.

9) 12-Mar-95 18:00 to 14-Mar-95 12:40
No observation due to SXT error and recovery.

10) 25-Mar-95 10:30 to 27-Mar-95 04:52
No observation due to SXT error and recovery.

11) 26-Oct-95 05:00 to 28-Oct-95 05:00 
Yohkoh fell into the safehold mode after the solar eclipse observation
on 24-Oct. No observation was made during recovery operations.

12) 17-Jul-96 19:05 to 19-Jul-96 20:50
Kagoshimra (ground station) operation cancelled due to approaching Typhoon.

13) 27-Jul-96 18:00 to 29-Jul-96 14:10
No observation due to SXT operation error and following recovery.

14) 29-Dec-97 01:50 to 04-Jan-98 03:15 
No observation due to SXT error during Kagoshima operation holiday,
and following recovery.

15) 13-Mar-98 22:00 to 15-Mar-98 18:10 
No Kagoshima operation due to antenna trouble.

16) 11-Apr-98 10:02 to 13-Apr-98 04:30 
No observation due to SXT error during Kagoshima operation holiday,
and following recovery.

17) 23-Aug-98 20:00 to 25-Aug-98 13:00 
Yohkoh fell into the safehold mode after the solar eclipse observation
on 22-Aug. No observation was made during recovery operations.

18) 25-Jul-99 23:00 to 27-Jul-99 00:30 
No observation due to SXT error and recovery.

19) 22-Sep-99 16:30 to 24-Sep-99 15:00 
Kagoshimra (ground station) operation cancelled due to approaching Typhoon.

20) 28-Jan-00 10:30 to 30-Jan-00 03:00 
No observation due to SXT error and recovery.

21) 14-Jun-00 10:21 to 16-Jun-00 09:00 
The Crab Nebula observation with HXT (SXT turned off), followed by
an SXT table error. No observation except a few hours in 15-Jun.

22) 10-Oct-00 07:00 to 12-Oct-00 05:00 
Malfunctioning of the satellite attitude control system.
No PFIs(partial sun) available, FFIs(whole sun) severe pointing excursion.

23) 31-Dec-00 02:30 to 04-Jan-01 07:28 
No observation due to SXT error during Kagoshimra operation holidays.

24) 22-Nov-01 16:20 to 24-Nov-01 20:30 
No observation due to SXT error and recovery.