May 8, 2000 
                                                           H. Hudson 


 
                   CHIEF OBSERVER'S REPORT for Week 19
                        1-May through 8-May-00


GENERAL 

Yohkoh supported JOP122 (network flares), a campaign ideally planned
from the solar point of view (zero activity) but badly timed from
the Yohkoh point of view (weekend operations on invisible orbits).
The background GOES level had dropped to B2 on Sunday. Amazing.
But, a huge flare marked the disappearance of the AR 8971-8977 
complex. Although only M1.5, and with a puny peak microwave flux
of 67 SFU at 2695 MHz, the regions were 10-25 degrees beyond the
limb - if the latter, which on-disk flares suggest, the occultation
height was some 70,000 km. So this was really one of our missing X-class
flares.

SXT TECHNICAL 

SXT functioned properly.  There were no apparent problems this week.

For Web material see

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/000505.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

This week's nugget describes an interesting case of coronal magnetic
reconnection found accidentally in an attempt to see solar counterparts
of WIND/WAVES type III bursts.

CAMPAIGNS 

Next week we have no campaigns except for the last day of JOP122, with
VLA participation.  Target-of-opportunity JOPS that may see use are
trans-equatorial loops and sigmoids. We intend to get some more rapid-run
SFD observational material, encouraged by the May 5 event's over-the-limb
Moreton wave.

For SXT plans, see:

http://isass1.solar.isas.ac.jp/sxt_co/sxt_future.html

For SXT completed campaigns, see:

http://isass1.solar.isas.ac.jp/sxt_co/sxt_catalog.html

PERSONNEL

No changes.

SEMINARS

Last week: none.

This week: TBD.


                      SXT TABLE PLAN, WEEK 20
                      (08-May-00 - 08-May-00)

Campaigns: Final day of VLA time May 8, JOP122 on network flares

________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Monday PM      08-MAY-00 02:50     1      000508 P1 ARS1 DKCAL
Monday PM      08-MAY-00 07:56     4      000508 P4 ARS0 JOP122 
Tuesday PM     09-MAY-00 06:23     3      000509 P3 ARS1 DIF
Wednesday PM   10-MAY-00 01:27     1      000510 P1 ARS1 RAPID
Thursday PM    11-MAY-00 03:18     2      000511 P2 ARS1 RAPID
Friday PM      12-MAY-00 05:09     3      000512 P3 ARS1 RAPID
Saturday PM    13-MAY-00 05:19     4      000513 P4 ARS1 STD 

Continuing requests:

KSC & SSOC Tohbans: If any KSC passes are likely to be cancelled (for
example due to heavy snowfall) 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).

KSC Tohbans: In general flare mode supersedes table upload, i.e. if a
flare is in progress please do not upload a new table, and contact the
chief observer. Normally it is OK to go ahead with the planned table
without change on the next pass, if it is available. Chief observers
should keep an eye on this.