From spencer Wed Jun 28 12:25:59 1995 From spencer Wed Jun 28 12:25:59 1995 To: mail, oleroemer Subject: Ole Roemer Messenger Content-Length: 12211 X-Lines: 289 Status: RO __________________________________________________________________________ T H E O L E R O E M E R M E S S E N G E R _______________________________________________ JJJJ C G JJJJJJ I E JJJJ __________________________________________________________________________ Newsletter of the International Jupiter Watch Satellite Discipline Issue 17 June 28, 1995 Editor and Discipline Leader: John Spencer Voice: (520) 774-3358 Lowell Observatory Fax: (520) 774-6296 1400 W. Mars Hill Rd. (Note the new telephone area code) Flagstaff, AZ 86001 Internet: spencer@lowell.edu FTP site: ftp.lowell.edu, directory pub/ijw ___________________________________________________________________________ CONTENTS 1) Io Activity Update 2) SO identified on Io! 3) No new plumes, new mountains instead (?) 4) Call for papers: Io workshop at DPS. 5) FTP site revamped 6) Publications in the pipeline ___________________________________________________________________________ 1) IO ACTIVITY UPDATE We are continuing to monitor Io's volcanic with good time resolution, though I have no recent "official" reports, and most of the data have not been fully reduced yet. The JPL group (Jay Goguen et al) observed Io's 5 - 20 micron lightcurve on June 11-13 UT at the IRTF. Bob Howell in Wyoming obtained 5-micron speckle photometry on June 11 and 12. John Spencer observed Io eclipses and occultations by Jupiter at Lowell at 1.7 and 2.3 microns on May 24 and June 9, 11, 18, and 25. In preliminary reductions, Io looks pretty quiet- more details later. ___________________________________________________________________________ 2) SO INDENTIFIED ON IO! The following IAU circular (6179) was sent out this morning. You can reach Emmanual Lellouch at lellouch@meudon.DNET.NASA.GOV. JUPITER I (IO) E. Lellouch, Observatoire de Paris, Meudon; G. Paubert and R. Moreno, Institut de Radio Astronomie Millimetrique (IRAM), Granada; D. F. Strobel, The Johns Hopkins University; and M. Belton, National Optical Astronomy Observatories, report: "We have observed Jupiter's satellite Io with the IRAM 30-m radiotelescope at Pico Veleta (Spain) on May 30 and 31, and June 22-24, detecting the SO (6,5)-(5-4) transition at 219.949 GHz on both the leading and the trailing sides of Io. The line properties are similar to those of the SO2 lines observed since 1990 with the same telescope (i.e., an antenna temperature line contrast of about 60 mK and a FWHM width of about 0.65 MHz). We have also obtained a likely detection of the weaker SO (4,3)-(3-2) line at 138.179 GHz, with a line contrast of about 20 mK. These observations represent the first detection of SO in the atmosphere of Io, and a preliminary interpretation suggests an SO/SO2 relative abundance of a few percent." ___________________________________________________________________________ 3) NO NEW PLUMES, NEW MOUNTAINS INSTEAD (?) The "blips" on the terminator discovered in Voyager images of Io (FDS 20641.52, 20641.55, 20641.58, and 20642.01) by Alfred McEwen and reported in the last Ole Roemer are probably very high mountains rather than plumes. Paul Schenk ("LPI2::SCHENK"@lpi.jsc.nasa.gov) sent the following message on April 19th, and Alfred concurs: Ive taken a quick look at the protoplumes reported by Al in the last ORM. The identification as plumes may be a little premature. That area is covered in a few of the stereo and color mosaics I'll be presenting in Hawaii. The two spots cited correspond pretty closely with 2 irregular shaped plateau-like features 100-200 km across (no heights, yet). They appear to be geologic rather than atmospheric (that is they have scarps and complex surface texture), but are difficult to characterize due to low resolution and oblique imaging. It is a complex region with overlapping flows of different color and a number of units which are uncharacterizable. The shapes of the bumps on the V2 terminator images are not that much different from similar bumps to the south, and mountains are known to reach 10 km (+/-1 km) height elsewhere, so 15 km is not unreasonable (the error bars on Al's heights are probably large, and I'll be looking into all that in the weeks to come.). ___________________________________________________________________________ 4) CALL FOR PAPERS: IO WORKSHOP AT DPS Apologies for my tardiness in transmitting this message: the deadline is this coming Friday, but perhaps if you blame me for your lateness the organisers will be forgiving... --------------------- Workshop on thermal remote sensing of volcanoes on Io and Earth October 8, 1995 The Ritz-Carlton, Mauna Lani, Kona, Hawaii This workshop will be held in conjunction with the 27th annual meeting of the Division for Planetary Sciences of the American Astronomical Society. The purpose of this workshop is to bring together the communities currently working on the analysis and modelling of high temperature volcanism on Io and Earth. The intention is that the different communities will be able to learn from each other and to share ideas and expertise. The workshop will also set the stage for the Galileo encounter with Io in December 1995. The preliminary program includes review talks on state-of-the-art measurements of heat flow from lava flows and lakes, both in the field and from Earth-orbiting satellites; a review of satellite and Earth-based observations of eruptions on Io; and contributed papers on the interpretations and modelling of these observations. There will be a short presentation on the expected Galileo Io data and on plans for future Io observations. The program will leave plenty of time for group discussions. Those interested in attending and in presenting a paper should contact one of the organizers below with a title and a DPS-format abstract by 30 June 1995. Talks will be limited to 15 minutes including discussion. The Organizing Committee will send abstracts on to DPS for inclusion in the Bulletin of the AAS. Organizing Committee: Rosaly Lopes-Gautier Mail Stop 183-601 Jet Propulsion Laboratory Pasadena, CA 91109 phone: (818) 393-4584 or 393-0996 e-mail: rlopes@jpluvs.jpl.nasa.gov David Rothery Department of Earth Sciences The Open University Milton Keynes United Kingdom phone: (1908) 652124 D.A.Rothery@open.ac.uk Ashley Davies Mail Stop 183-501 Jet Propulsion Laboratory Pasadena, CA 91109 phone: (818) 393-1775 e-mail: agd@kookaburra.jpl.nasa.gov PRELIMINARY PROGRAM: Chair's address and outline of major themes 1. Io Data (invited reviews) 1.1. Voyager imaging and Voyager IRIS (Alfred McEwen, USGS Flagstaff) 1.2. Earth based monitoring since Voyager: updates by the Lowell, JPL, and Wyoming groups) (John Spencer, Lowell Observatory) (Diana Blaney, JPL) (Robert Howell, University of Wyoming) 2. Earth Data (invited reviews) 2.1. Remote sensing of Earth volcanoes in the infrared: available data and what you can do with it (David Rothery, Open University) 2.2. Field measurements: lava lakes, a'a and pahoehoe lavas (Peter Mouginis-Mark, University of Hawaii) 3. Thermal models for volcanoes on Io and Earth (Contributed talks on the following major topics): 3.1. Thermal models based on Earth-orbiting satellite observations 3.2. Thermal models based on field observations 3.3. Io thermal models based on telescopic observations 3.4. Io volcanism models (evolution from sulphur to silicic models) and implications for surface expression 3.5. Comparative volcanology between Earth and Io 4. Future Opportunities (Contributed talks) 4.1. Io: Galileo (NIMS/SSI/PPR) 4.2. Io: HST 4.3. Io: Continuing ground based monitoring 4.4. Earth: EOS/ADEOS/HSI/Lewis 5. General discussion ___________________________________________________________________________ 5) FTP SITE REVAMPED After a year or more of neglect, I have cleaned up and updated the ftp site for the IJW Satellite Discipline. You can find it at ftp.lowell.edu, in pub/ijw. The "CONTENTS.DOC" file contains an up-to-date listing of the files therein, which include quite a lot of new stuff. New items include new Voyager 2 global mosaics of Io from Alfred McEwen, a Sun executable for reading Voyager PDS CD-ROMs on Sun Workstations, an IDL routine for removing reseaus from Voyager images, and updated back issues of all Ole Roemer Messengers. Here's a copy of the current CONTENTS.DOC file: ----------------------- Contents of the directory pub/ijw at ftp.lowell.edu: Archive of miscellaneous files for the International Jupiter Watch Satellite Discipline. Maintained by John Spencer, Lowell Observatory. roemer??????.doc Back issues of the Ole Roemer Messenger: the date is included in the title of each file. mailinglist.doc The e-mail mailing list for the Messenger, with real names included for most people. iobase.fits.Z Compressed FITS-format Voyager image mosaic of Io, using the latest Io control network (accurate to < 1 degree). Not photometric: good for positions only. Courtesy Alfred McEwen. 3600 x 1800 byte array with 0.1 x 0.1 degree pixels, x value goes from 179.95 to -179.95 degrees longitude, y value from 89.95 to -89.95 degrees in latitude. iobasesmall.fits.Z Like iobase.fits.Z but 1800 x 900 with 0.2 x 0.2 degree pixels, from 179.9 to -179.9 in longitude, 89.9 to -89.9 in latitude. iobasetiny.fits.Z Like iobase.fits.Z but 720 x 360 with 0.5 x 0.5 degree pixels, from 179.75 to -179.75 in longitude, 89.75 to -89.75 in latitude. iobaseg.fits.Z Like iobase.fits.Z but with a 10 x 10 degree latitude/ longitude grid superimposed. iobase.doc Documentation from Alfred McEwen describing the "iobase" mosaic, plus the above details about the FITS versions of the mosaics. loki.fits.Z Compressed FITS-format Voyager image of Loki, FDS 16389.42, blue filter, reprojected to simple cylindrical projection and tied to same control net as the iobase mosaic. Courtesy Alfred McEwen. 848 x 976 byte array with 1/16 degree pixels, from 275 to 328 in longitude, -11 to +50 in latitude. No photometric corrections or filtering applied: I/F=DN*0.00294 assuming the narrow-angle blue correction factor is 1.000. cdread Sun executable for reading PDS CD-ROM images. reseaurem.pro IDL routine for removing reseaus from Voyager images newv2mos_??.fits Voyager 2 global mosaics of Io, by Alfred McEwen, with improved photometric and geometric control. 1080 x 540 pixels. See newv2mos.doc for documentation. newv2mos_uv.fits UV filter mosaic newv2mos_vi.fits Violet filter mosaic newv2mos_bl.fits Blue filter mosaic newv2mos_gr.fits Green filter mosaic newv2mos_or.fits Orange filter mosaic newv2mos.doc Documentation for these mosaics. _____________________________________________________________________________ 6) PUBLICATIONS IN THE PIPELINE There are quite a lot of new preprints being circulated, but in the interests of getting this newsletter out I'll wait for the next issue to provide a full listing. _____________________________________________________________________________