19 January 1998
                                                            Hugh Hudson 
  

              SXT CHIEF OBSERVER'S REPORT AND TABLE PLAN

                 CHIEF OBSERVER'S REPORT for Week 3 
                       12-Jan-98 to 19-Jan-98


SOLAR ACTIVITY

Solar activity returned from its low point. AR8131 grew up on the disk
and made many C-class flares as well as one M event.

SXT INSTRUMENT STATUS

SXT continues to function well. 

SXT SCIENCE 

There are no special items to report this week. The "science nugget"
will deal with the interesting growth phase of AR8131, which seemed not
to make many flares initially but then to make lots of small ones.

Weekly: ftp://isass0.solar.isas.ac.jp/pub/sxt_co/SXTweekly.html
Index:  ftp://isass0.solar.isas.ac.jp/pub/sxt_co/index.html
1997:   ftp://isass0.solar.isas.ac.jp/pub/yohkoh_in_1997/1997.html

CAMPAIGNS

There were no official campaigns conducted this week. 

PERSONNEL

L. Acton arrived last week, forgot to mention it then! Visitor M. Sersen
arrived from Bratislava for a two-week stay.

SEMINARS

There were no seminars this week. A new series of ISAS/Yohkoh seminars
will begin on Jan. 22.

  
^L
                     SXT TABLE PLAN FOR WEEK 4 
                      (19-jan-98 - 26-jan-98)

SXT Chief Observer: Hudson

There will be VLA solar observations this week, which SXT (plus SOHO
and others) will support. N. Gopalswamy will be the contact point, and
we will try to match the selected pointing as best we can. The contact
pass schedule is fairly good time-wise this time, but we are hampered
a bit by loss of passes to the maintenance effort at KSC.

________________________________#_______________________________

JST Day     UT Start Time      Pass    Table ID

Friday      15-JAN-98 23:53     2      980115 P2 ARS1 STD
Saturday    17-JAN-98 00:12     3      980116 P3 ARS1 STD    
Monday      19-JAN-98 00:48     4      980118 P4 ARS1 DARKCAL
Tuesday     19-JAN-98 21:40     2      980119 P2 ARS1 VLA+DIF
Wednesday   20-JAN-98 20:15     2      980120 P2 ARS1 VLA
Thursday    21-JAN-98 20:33     2      980121 P2 ARS1 VLA
Friday      22-JAN-98 19:09     1      980122 P1 ARS1 VLA
Saturday    23-JAN-98 19:27     2      980123 P2 ARS1 VLA
Sunday      24-JAN-98 23:11     2      980124 P2 ARS1 STD

Note that this plan is subject to change. Note also that the
table names don't match very well because we are rotating
past 00 h UT - our convention is to name the table based on the
UT of pass 1 on that day.

Continuing requests:

SSOC Tohban: On the weekly visible diagram, please mark the official
five passes first and then cross out those passes that will be given to
other satellites.  That way we can keep the numbering straight in the
Yohkoh software system.

SSOC Tohban: SXT operations do not currently include terminator off- 
pointing. It is unnecessary this week to ask the SXT Chief Observer
for terminator off-pointing information.

KSC & SSOC Tohbans: If any KSC passes are likely to be cancelled (for
example due to a typhoon) or an SXT table cannot be uploaded for some
reason, please telephone and e-mail the Chief Observer immediately.
(sxt_co@isass0.solar.isas.ac.jp, copy to sxt_st@flare2.solar.isas.ac.jp).