10 December 1995
                                                 Serge Savy/Hugh Hudson
                                                     
                                                      
                SXT CHIEF OBSERVER REPORT AND TABLE PLAN

SXT CHIEF OBSERVER'S REPORT for Week 49:   4-DEC-95 to 10-DEC-95

 
SOLAR ACTIVITY

The Sun was quiet this week with no major flares observed by Yohkoh. 
For most of the week there was only one small active region (AR 7930) on
the disc.


SXT INSTRUMENT STATUS

An SXT Bitmap Error was found during pass 1 on 06-Dec-95 (Wed) and was
recovered during the same pass with Yobi C. Except for that error, SXT has
been functioning normally. 


CAMPAIGNS

We started the week with quiet corona observations on Monday (4 December). 
Deep PFI images near disc centre were recorded. 
 
On Thursday the standard table was loaded with the flare mode tables set to
record PFIs in only one filter.  The purpose is to obtain high time cadence
observations of any flares that may occur in the near future (Hudson).

  
SEMINARS

There was a regular Yohkoh seminar on Wednesday.  The speaker was K.  Yaji
(GUAS/NAO) and the title was "Microwave and X-ray Sources at the Looptop
in Solar Flares"




                       SXT TABLE PLAN FOR WEEK 50
                        (11-DEC-95 to 17-DEC-95)

There will be no official campaigns this week but on Monday we will obtain
deep PFI exposures of the quiet corona near disc centre unless there is a
very bright region.  This table will nominally run for two orbits, but we
may leave it in overnight if conditions on pass #1 warrant.  We tentatively
plan the same activity for Thursday and Friday. 
                                            
There will be a DKCAL table loaded on Tuesday. Standard diffuser images 
(both low8 and compressed) will be taken on Thursday during routine 
operations.

This week we continue with the terminator program, but we will not need
new OG's to be written this week as terminators at some of last weeks offpoint
positions still need to be taken.

The provisional SXT Table Plan for the week is as follows:

    KSC Time (start) in JST     Pass          Table ID        
_____________(= UT + 9 hrs)______#_______________________________

Monday      11-DEC-95 12:55       2      951211 P2 ARS0 QUIET CORON
Monday      11-DEC-95 16:22       4      951211 P4 ARS1 STD+LONG 
Tuesday     12-DEC-95 11:32       2      951212 P2 ARS1 DKCAL
Wednesday   13-DEC-95 13:34       3      951213 P3 ARS1 QUIET CORON 
Thursday    14-DEC-95 10:27       2      951214 P2 ARS0 QUIET COR D
Thursday    14-DEC-95 13:53       4      951214 P4 ARS1 STD+LONG 
Friday      15-DEC-95 10:46       2      951215 P2 ARS0 QUIET CORON 
Friday      15-DEC-95 14:12       4      951215 P4 ARS1 STD+LONG
Saturday    16-DEC-95 09:22       2      951216 P2 ARS1 STD+LONG


   SSOC TOHBAN, please fax the preliminary OP list to D-tou when it
contains a terminator so that the Chief Observer can suggest which OG's to
use.  

Dumping Patrol images:
   We request that KSC tohban continue to dump a patrol image each
time an SXT table is loaded to facilitate the study of optimizing
ARS parameters for an awfully quiet period.