Report from ISAS 10 October - 16 October, 1994 David Alexander SUMMARY During the week of 10-16 October SXT participated in the "Coronal Synoptic" campaign organized by Bernie Jackson. This campaign continues until Oct 25. SXT operations went very well. Solar activity is low, but a beautiful active region on the east limb resulted in some nice coronal emission. There were no major earthquakes this week and so we were left to provide our own entertainment. If you really like to shake I would recommend the Marguerita's at The Hard Rock Cafe. OPERATIONS Operations this week were potentially quite complicated as we carried out a series of offpoints in conjunction with the synoptic campaign at Sac Peak. The modifications to op_first_guess by Jim Lemen simplified this procedure considerably and all planned operations were successful. We performed three offpoints each day; East 8', South 8' and West 8'. At each offpoint we took full frame images in three filters (Al.1, AlMg and Mg3) to provide a good degree of temperature diagnostic capability. A composite image collating the three offpointed images was produced daily by Hugh Hudson and this image was put in the ISAS anonymous ftp facility for use by our campaign collaborators. For those interested, last week's campaign observations can be found by anonymous ftp to isass0.solar.isas.ac.jp in directory sacpeak. Observing plans for the upcoming MSSTA rocket flight of Art Walker on Oct 25 were discussed and these will be finalised this week by Tsuneta-san and Alexander. The synoptic campaign of Sac peak has been extended to cover this rocket flight. Jim Lemen, Hugh Hudson and David Alexander (mostly Jim) did some work in automating the search of the terminator database. There is now a program called pr_sxt_term which produces a table showing pointing and filter information for all terminator images taken between dates specified by the user. This will facilitate the planning of offpoint terminators by the SXT Chief Observer. The next stage in the development of this program will be to access this database and provide some information on the behaviour of the straylight with pointing. The first_light program is nearing its final version and with a few more tweaks the first_light committee can disband. I would recommend that most of you have a look at this. It updated in show_pix on a daily basis and it is hoped that it will provide a concise description of current solar conditions as observed by a veritable plethora of observatories bothe space-borne and earth-bound. There were some severe problems with our main computer (isass0) this week which we believe have now been sorted thanks to the sterling efforts of Jim Lemen (what a guy!). The trials and tribulations have been discussed in a brief report distributed by Jim and I will refer people to that for details. SOLAR ACTIVITY Solar activity was low again this week. There were no C-class events registered by the GOES satellites. The most intense event recorded was a B9.7. Lots of wiggles, some bumps but nothing much to write home about. PERSONNEL Zdenek Svestka arrived from Holland and is now a bona fide Unix user. Hugh Hudson and Jim Lemen packed their hula skirts and snorkel masks and headed off for a strenuous week of CDAW hosted by the University of Hawaii. David Alexander meanwhile struggles on as Chief Observer facing another week without Macadamia nuts. Gary Linford arrives on Wednesday free from worries about having to deal with first_light and isass0. SCIENCE Zdenek Svestka is studying the SXT database for flare events which show evidence for coronal arches. He plans to address the relationships between post-flare loops, giant coronal arches and eruptive flares. Saku Tsuneta has continued working on the limb flare of Feb 21 1992 and presented this work at the ASJ in Sapporo. His conclusons are that the interior of the cusp like structure is cool in contrast to the hot exterior. The exterior regions are also regions of low emission measure. Alexander and Hudson discussed high energy solar physics as Hudson prepares his review paper on this topic with Jim Ryan of University of New Hampshire. Hudson also worked on the eruptive event of April 14 in preparation for the Hawaii CDAW. Lemen prepared some work on the event of Sep 1 1994 for the CDAW next week. He has compared BCS temperatures and emission measures with those derived from the SXT partial frames. His conclusions will be presented in Hawaii.