PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2011-05-04 INTERCHANGE_FORMAT = ASCII NOTE = "ASCII description of contents of GEM Archive" END_OBJECT = TEXT END The present volume contains just the Dust Impact Detector results, repackaged as a single-dataset volume, extracted from the legacy volume described below. -A.Raugh, 2011-05-04 ***** File AAREADME.TXT This CD-ROM contains data obtained by participants in ESA's Giotto Extended Mission and assembled for archiving jointly by ESA's GEM Project and the Small Bodies Node of NASA's Planetary Data System (PDS). This volume includes spacecraft measurements during the July 10, 1992 encounter with comet 26P/Grigg-Skjellerup as listed below. GEM Spacecraft Data CD-ROM Archive MISSION EXPERIMENT NAMES Data Type Data Content GEM DUST-IMPACT-DETECTOR table dust impacts ENERGETIC PARTICLE ANALYZER table particle counts GIOTTO-RADIO-SCIENCE time series freq, amp residuals IMS-HIGH-INTENSITY-SPEC table particle flux JOHNSTONE PLASMA ANALYZER table particle flux MAGNETOMETER table field comonents OPTICAL-PROBE-EXPERIMENT table intensities In addition to the spacecraft measurements, sets of ground based images, using various filters, have been included in the archive. A collection of 33 CCD images from 1986 through 1993 were submitted by H. Boehnhardt and G. Matella while two images on July 25, 1992, just after the encounter, were provided by A. Rotundi. Supporting files for the Archive user include PDS descriptions, documents, searchable indices, a mission ephemeris, and software tools (code as well as IDL procedures). These have been organized into five directories one level below the root: CATALOG, DOCUMENT, EPHEMRIS, INDEX, and SOFTWARE. An overview of the GEM mission is provided in the DOCUMENT directory along with digitized articles from ESA SP-1077, describing the instruments. (Note that these articles, which were digitized using a convention developed by the International Halley Watch, are set for fixed width of 132 bytes; other digitized document or text files follow current PDS guidelines.) The data directories are signified by an experiment abbreviation (see outline below) plus the special case when the JPA and MAG data are presented in merged files which have been resampled in time. A final data directory (IMAGES) contains the ground-based images submitted as part of the archive. Structure for GEM CD AAREADME.TXT (PDS required introduction to the CD-ROM volume) VOLDESC.CAT (PDS required volume description of the data only) /CATALOG/CATINFO.TXT (list of catalog files) *.CAT (Mission, spacecraft, instrument, data, references) /DOCUMENT/DOCINFO.TXT (list of documents) /EPHEMRIS/*.TXT (Description of spacecraft attitude, code and position) *.TAB (POSITION table for spacecraft and comet) /GEM/*.DOC (Explanatory description for various data products) *.TIF (Digitized figures for document files) *.TXT (Digitized abstracts and introductory article) /INSTRUME/GIO*.TXT (DID,EPA,GRE,IMS,JPA,MAG,OPE publications) /INDEX/INDXINFO.TXT (discussion of various index tables) IMGINDEX.TAB (listing of 35 earth based images) GEMINDEX.TAB (PDS index for the data contents) /SOFTWARE/SOFTINFO.TXT (discussion of code, procedures) /DOC/SWINV.CAT (documentation for catalog) *.TXT (documentation and code explanation) /SRC/*.FOR (calculate space vectors and light travel time) *.PRO (procedures to display IMAGE, TABLE (ASCII AND BINARY) *.C,*.H,.MAK,.LST (convert PDS label to FITS header) /DATA Master data directory containing one subdirectory for each instrument or experiment /DID/DID*.TAB (ancillary calibration tables) *.TXT (results in text form) /EPA/EPACHAN*.TAB (data separated into 4 channels) /GRE/GRECL.TAB (closed loop results) GREOL.TAB (open loop results) /IMAGES/IMAGE*.fit (earth based images - Oct 1986 to Sept 1993) /IMS/HIS*.FIT (submitted FITS files with data truncation) HIS*.TAB (reformatted and corrected tables) /JPA_MAG/JPAMG*.TAB (two variations of data merged with B field) /JPA/D4D/D*.TXT (4 dimensional source data, full) /STC/S*.TXT (START/TAC pulse source data) /TOF/T*.TXT (source data from Time Of Flight) /MAG/MAGAV*.TAB (MAG data time averaged presented as ASCII tables) MAGnnn*.DAT (MAG data time averaged presented as BINARY) MAGnnnnn*.DAT (MAG source data as binary table) /OPE/OPE*.TAB (tables of counts plus calibration) The GEM project in consultation with the Small Bodies Node decided that the data would be archived in the PDS format. Consequently, the layout of this volume and the labels for each file conform to PDS guidelines. The components of this data collection, however, are not fully compliant since they have not been through a formal PDS peer review. The data suppliers individually address the validity of the data. We wish to acknowledge the work of each PI for the eight GEM experiment teams as well as the special efforts of A. Coates, P. Daly, N. McBride, M. Paetzold, and J. -B. Renard in supplying the relevant data. The GEM project through the efforts of T. Morley supplied the ephemeris code and explanatory files. The entire Small Bodies Node staff was responsible for the development of the software and preparation of the CDROM archive. The GEM project completed the final production of the booklet and CDROM. The distribution of the GEM archive is being handled jointly by both groups. Small Bodies Node, Planetary Data System Department of Astronomy, University of Maryland College Park, MD 20742-2421 pdssbn.astro.umd.edu 02 August 2006 ============== The catalog files and labels on this volume were updated to adhere to current PDS standards. Note that the data will never be subject to a full PDS external peer review, and thus will be given a status of "SAFED" (i.e., save-the-bits) in the PDS catalog. 18 August 2006 ============== Documented errata have been applied to these files. -Anne Raugh.