REPORT ON THE IJW SATELLITE DISCIPLINE MEETING, 1996 DPS. The IJW Satellite Discipline met on Friday October 25th, during the 1996 DPS meeting in Tucson. IJW STEERING COMMITTEE John Spencer reported on the IJW Steering Committee meeting, held earlier the same day. Reta Beebe is replacing Glenn Orton as Atmospheres leader, and Doyle Hall is replacing Nick Thomas as Torus leader. A workshop to compare groundbased and Galileo magnetospheric and aurora observations is planned for early 1997. There was agreement that it's currently difficult to find out details of the Galileo spacecraft observation plans. A detailed and intelligible timeline of Galileo observations may become available on the Web shortly, manpower permitting. "IO WORKING GROUP" Torrence Johnson reported on the "Io Working Group", which was a subset of the IJW Satellite discipline (about 10 people) who met at Lowell Observatory on 8th-9th October to compare Galileo and groundbased observations of Io's hot spots. As there appeared to be sufficient data available from Galileo and the ground for several publications about recent hot spot results, Torrence is exploring the idea of a Geophysical Research Letters special Io issue, with submission deadline of perhaps the end of December. Papers on both groundbased and Galileo results are encouraged. Future "IWG" activities will be publicised via the IJW Satellites Discipline. Torrence also mentioned that there would be a Ganymede special issue of GRL, including non-Galileo results, with a submission deadline of mid-January. John Spencer discussed the tables of Io hot spot locations and fluxes, (from NIMS, SSI, and the ground), plume activity, and surface changes that he is compiling as a result of the "Io Working Group" meeting: these should be publicly available soon and will probably be published in some form in the GRL special issue. John Spencer also showed the results of his tabulation of everyone's 1996 observations of Io's volcanos, which is now fairly complete except that it does not yet include observations by the JPL group, or G2 Galileo observations. At the time of the meeting, 92 nights of 1996 observations were tabulated, none of which had shown a major 5-micron outburst. The current version of the table is available on the Satellite Web site via the "Io Volcanic Activity" page (www.lowell.edu/users/ijw/volnews.html). REPORTS ON 1996 OBSERVATIONS Jay Goguen reported on observations by the JPL group, which have shown enhanced activity near the longitude of Pele in 1996, but otherwise show low activity levels at all longitudes. Hints of possible hour-timescale variability in the 5 micron data prompted Bill Sinton to remind the group of his tentative observations of rapid variability of Io's thermal emission in the early 1980s. Jay also showed new 10-micron spectra of Io taken at Palomar, which showed a possible spectral feature near 12 microns. Bruce MacIntosh reported on observations by the Livermore/Berkeley group who have recently obtained 0.04 arcsec resolution speckle images of Io in eclipse at the Keck, at 2.2 microns on 6th September. They plan similar observations in 1997, and may be able to extend the technique to longer wavelengths. Spencer reported on observations by the Lowell group, who have seen low activity levels on the Jupiter-facing hemisphere throughout 1996, except for a gradual fading of Loki during the first half of the year, and two brief, very hot, events previously reported here, in late August and early October. Bob Howell reported on observations of occultations of Io by Jupiter at 10 microns (never before attempted), which showed thermal emission both from Loki and more widely distributed across Io's disk. He also noted the lack of major thermal events in his 1996 5-micron Io observations. 1997 TORUS CAMPAIGN Nick Thomas, outgoing IJW Torus Discipline leader, discussed the Torus Discipline's plans for monitoring of the plasma torus and sodium cloud with high time resolution throughout the 1997 Jupiter apparition. Combined with the frequent monitoring of the volcanic activity by the Satellite discipline, and Galileo observations, this campaign will give us our best chance to look for correlations between volcanic activity and the torus and neutral clouds, should such correlations exist. 1997 MUTUAL EVENTS The upcoming satellite mutual events were briefly discussed. Current observing plans include Goguen at the IRTF and in Australia, and elsewhere, Spencer at the IRTF, UKIRT, Keck, and Lowell, and Howell at Lowell and/or WIRO. All plans are still subject to TAC approval. IO CONFERENCE IN FALL 1997 Spencer mentioned his plans for a general 2-day Io conference to be held at Lowell Observatory in October 1997, and there was agreement that this would be useful. Details later. -------------- That's everything that I can remember or extract from the incomplete notes that I took at the meeting- apologies if I left something out. John.