SIMPLE  =                    T / Standard FITS format                           BITPIX  =                    8 / Character information                          NAXIS   =                    0 / No image data array present                    EXTEND  =                    T / Standard extensions                            OBJECT  = 'P/HALLEY'           / Object of investigation                        FILE-NUM=               089003 / File number                                    DATE-OBS= '13/03/86'           / Date of mid-observation                        TIME-OBS= '.98     '           / Mid-time of observation                        LONG-OBS= '999/99/99'          / Longitude of observatory                       LAT-OBS = '+99/99/99'          / Latitude of observatory                        DATE-REL= '01/07/90'           / Date of release                                DISCIPLN= 'GIOTTO/DID'         / Giotto DIDSY experiment data                   SYSTEM  = '05009987'           / Observation system                             OBSERVER= 'MCDONNELL,J.A.M/ET AL.' / Giotto DIDSY team (as A&A, 1987)           SUBMITTR= 'GREEN,S.F/PANKIEWICZ,G.S' / Submitters to IHW                        SPEC-EVT=                    F / No special events inserted or deleted                                                                                          DAT-FORM= 'ASCII   '           / Data in tabular ASCII form                     ORIGIN  = 'UNIV.KENT,U.K'      / Site at which tape was written                 DATE    = '08/05/90'           / Date tape was written                          COMMENT  GIOTTO DUST IMPACT DETECTION SYSTEM (DIDSY) DATA                       COMMENT  UNIT FOR SPACE SCIENCES, UNIVERSITY OF KENT,                           COMMENT  CANTERBURY, KENT, CT2 7NR.                                             COMMENT  FILE 089 003                                                           COMMENT  MAIN SHIELD MOMENTUM SENSORS ON LARGE SECTOR                           COMMENT  DID2/3 (INCLUDES ALL 4 MODES)                                          COMMENT                                                                         COMMENT  ADD. OBS. ALEXANDER,W.M/BURTON,W.M/BUSSOLETTI,E/EVANS,G.C/             COMMENT  ADD. OBS. EVANS,S.T/FIRTH,J.G/GRARD,R.J.L/GREEN,S.F/GRUN,E/            COMMENT  ADD. OBS. HANNER,M.S/HUGHES,D.W/IGENBERGS,E/KISSEL,J/                  COMMENT  ADD. OBS. KUCZERA,H/LINDBLAD,B.A/LANGEVIN,Y/MANDEVILLE,J.C/            COMMENT  ADD. OBS. NAPPO,S/PANKIEWICZ,G.S/PERRY,C.H/SCHWEHM,G.H/                COMMENT  ADD. OBS. SEKANINA,Z/STEVENSON,T.J/TURNER,R.F/WEISHAUPT,U/             COMMENT  ADD. OBS. WALLIS,M.K/ZARNECKI,J.C                                      END                                                                                                                                                             XTENSION= 'TABLE   '           / Table extension                                BITPIX  =                    8 / Character                                      NAXIS   =                    2 / 2-D matrix                                     NAXIS1  =                  100 / Number of characters per row                   NAXIS2  =                 3589 / Number of rows                                 PCOUNT  =                    0 / No random parameters                           GCOUNT  =                    1 / Only one group                                 TFIELDS =                   15 / Number of fields per row                       EXTNAME = '3 DIDSY MSM2/3'     / Name of file                                   EXTVER  =                    4 / Extension version number                                                                                                       TTYPE1  = 'HR      '           / Ground received time (hr)                      TBCOL1  =                    1 / Start in column 1                              TFORM1  = 'I2      '           / Integer nn                                     TUNIT1  = 'HOUR    '           / Hours                                                                                                                          TTYPE2  = 'MIN     '           / Ground received time (min)                     TBCOL2  =                    4 / Start in column 4                              TFORM2  = 'I2      '           / Integer nn                                     TUNIT2  = 'MIN     '           / Minutes                                                                                                                        TTYPE3  = 'SEC     '           / Ground received time (sec)                     TBCOL3  =                    7 / Start in column 7                              TFORM3  = 'F4.1    '           / Real xx.x                                      TUNIT3  = 'SEC     '           / Seconds                                                                                                                        TTYPE4  = 'DISTANCE'           / Cometocentric distance                         TBCOL4  =                   12 / Start in column 12                             TFORM4  = 'I6      '           / Integer nnnnnn                                 TUNIT4  = 'KM      '           / Kilometres                                                                                                                     TTYPE5  = 'FLAGS   '           / Data processing flags - see history            TBCOL5  =                   19 / Start in column 19                             TFORM5  = 'A5      '           / Character aaaaa                                                                                                                TTYPE6  = 'MODE'               / Operating mode - see comments                  TBCOL6  =                   25 / Start in column 25                             TFORM6  = 'I1      '           / Integer n                                                                                                                      TTYPE7  = 'MSM2/3 1 COUNTS'    / MSM2/3 bin1 dead-time corrected counts         TBCOL7  =                   27 / Start in column  27                            TFORM7  = 'E9.3    '           / Format                                         TNULL7  = '-.900E+01'          / Null value                                                                                                                     TTYPE8  = 'MSM2/3 1 FLUX'      / Derived particle flux                          TBCOL8  =                   37 / Start in column  37                            TFORM8  = 'E9.3    '           / Format                                         TUNIT8  = 'M-2.SEC-1'          / Per square metre per second                    TNULL8  = '-.900E+01'          / Null value                                                                                                                     TTYPE9  = 'MSM2/3 1 ERROR'     / Statistical error from original counts         TBCOL9  =                   47 / Start in column  47                            TFORM9  = 'I3      '           / Format                                         TUNIT9  = '%       '           / Percentage                                     TNULL9  = '-9      '           / Null value                                                                                                                     TTYPE10 = 'MSM2/3 2 COUNTS'    / MSM2/3 bin2 dead-time corrected counts         TBCOL10 =                   51 / Start in column  51                            TFORM10 = 'E9.3    '           / Format                                         TNULL10 = '-.900E+01'          / Null value                                                                                                                     TTYPE11 = 'MSM2/3 2 FLUX'      / Derived particle flux                          TBCOL11 =                   61 / Start in column  61                            TFORM11 = 'E9.3    '           / Format                                         TUNIT11 = 'M-2.SEC-1'          / Per square metre per second                    TNULL11 = '-.900E+01'          / Null value                                                                                                                     TTYPE12 = 'MSM2/3 2 ERROR'     / Statistical error from original counts         TBCOL12 =                   71 / Start in column  71                            TFORM12 = 'I3      '           / Format                                         TUNIT12 = '%       '           / Percentage                                     TNULL12 = '-9      '           / Null value                                                                                                                     TTYPE13 = 'MSM2/3 3 COUNTS'    / MSM2/3 bin3 dead-time corrected counts         TBCOL13 =                   75 / Start in column  75                            TFORM13 = 'E9.3    '           / Format                                         TNULL13 = '-.900E+01'          / Null value                                                                                                                     TTYPE14 = 'MSM2/3 3 FLUX'      / Derived particle flux                          TBCOL14 =                   85 / Start in column  85                            TFORM14 = 'E9.3    '           / Format                                         TUNIT14 = 'M-2.SEC-1'          / Per square metre per second                    TNULL14 = '-.900E+01'          / Null value                                                                                                                     TTYPE15 = 'MSM2/3 3 ERROR'     / Statistical error from original counts         TBCOL15 =                   95 / Start in column  95                            TFORM15 = 'I3      '           / Format                                         TUNIT15 = '%       '           / Percentage                                     TNULL15 = '-9      '           / Null value                                                                                                                     COMMENT  MODE OF OPERATION:                                                     COMMENT      TWO SENSORS LOCATED ON LARGE SECTOR OF SHIELD                      COMMENT      0   SIGNAL ON DID2 OR DID3                                         COMMENT      1   SIGNAL ON DID2 AND DID3                                        COMMENT      2   SIGNAL ON DID2 ONLY                                            COMMENT      3   SIGNAL ON DID3 ONLY                                            COMMENT  MASS THRESHOLDS:                                                       COMMENT  QUOTED FLUXES ARE CUMULATIVE (FOR ALL MASSES > THRESHOLD B)            COMMENT  A) MOST SENSITIVE PART OF SENSOR                                       COMMENT  B) EFFECTIVE THRESHOLD (95% OF IMPACTS HAVE LARGER MASS                COMMENT  C) MOST PROBABLE MASS FOR DIFFERENTIAL DATA                            COMMENT    MODE     CHANNEL       A         B          C                        COMMENT     0          1       1.7E-12   6.0E-12    4.0E-11    (KG)             COMMENT                2       1.8E-11   6.3E-11    4.2E-10                     COMMENT                3       1.7E-10   6.0E-10    3.6E-9                      COMMENT     1          1       1.5E-10   5.3E-10                                COMMENT     2          1       1.7E-12   6.0E-12    4.0E-11                     COMMENT                2       1.8E-11   6.3E-11    4.1E-10                     COMMENT                3       1.7E-10   6.0E-10    3.6E-9                      COMMENT     3          1       3.4E-12   1.2E-11    7.0E-11                     COMMENT                2       1.1E-10   3.9E-10    1.4E-9                      COMMENT                3       4.6E-10   1.6E-9     5.4E-9                      COMMENT  EFFECTIVE AREA OF SENSOR DEPENDS ON MASS DISTRIBUTION INDEX ALPHA AND  COMMENT  DEFINED LIMITING MASS. TABLE FOR ALPHA 0.3-2.0 AND MASSES (B) BELOW.   COMMENT                                                                         HISTORY  PROCESSING FLAGS RELATE TO PRODUCTION OF COUNTS FROM ORIGINAL MERGED   HISTORY  DATA TAPES.                                                            HISTORY  DUE TO LOSS OF TELEMETRY CERTAIN DIDSY DATA BLOCKS WERE INCOMPLETE.    HISTORY  FLAGS INDICATE PROCESSING TO EXTRACT THE USEFUL DATA FROM THESE BLOCKS.HISTORY  EACH OF FIVE FLAGS ARE SET TO * IF:                                    HISTORY    1) INCOMPLETE DATA BLOCK                                             HISTORY    2) NON-CONSECUTIVE BLOCK NUMBER IN DATA TRAIN                        HISTORY    3) BLOCK TIMING INCONSISTENT                                         HISTORY    4) FRAME COUNT INCONSISTENT                                          HISTORY    5) UNUSUAL FORMAT NUMBER IN FRAME INDICATING TELEMETRY BREAK         HISTORY  FLUXES CALCULATED ASSUMING ALPHA = 0.90. EFFECTIVE AREAS FOR OTHER     HISTORY  VALUES OF ALPHA:                                                       HISTORY  MODE ALPHA   CHANNEL1   CHANNEL2   CHANNEL3                            HISTORY   0    0.3      1.002      0.869      0.680                             HISTORY   0    0.4      0.815      0.697      0.544                             HISTORY   0    0.5      0.674      0.571      0.451                             HISTORY   0    0.6      0.566      0.476      0.383                             HISTORY   0    0.7      0.481      0.403      0.332                             HISTORY   0    0.8      0.414      0.345      0.291                             HISTORY   0    0.9      0.360      0.300      0.259                             HISTORY   0    1.0      0.317      0.264      0.233                             HISTORY   0    1.1      0.281      0.234      0.211                             HISTORY   0    1.2      0.252      0.210      0.193                             HISTORY   0    1.3      0.228      0.190      0.178                             HISTORY   0    1.4      0.208      0.174      0.165                             HISTORY   0    1.5      0.191      0.161      0.154                             HISTORY   0    1.6      0.177      0.150      0.144                             HISTORY   0    1.7      0.165      0.140      0.136                             HISTORY   0    1.8      0.155      0.133      0.129                             HISTORY   0    1.9      0.146      0.126      0.124                             HISTORY   0    2.0      0.139      0.121      0.119                             HISTORY   1    0.3      1.177                                                   HISTORY   1    0.4      1.037                                                   HISTORY   1    0.5      0.933                                                   HISTORY   1    0.6      0.854                                                   HISTORY   1    0.7      0.794                                                   HISTORY   1    0.8      0.749                                                   HISTORY   1    0.9      0.714                                                   HISTORY   1    1.0      0.688                                                   HISTORY   1    1.1      0.670                                                   HISTORY   1    1.2      0.657                                                   HISTORY   1    1.3      0.650                                                   HISTORY   1    1.4      0.648                                                   HISTORY   1    1.5      0.650                                                   HISTORY   1    1.6      0.657                                                   HISTORY   1    1.7      0.667                                                   HISTORY   1    1.8      0.681                                                   HISTORY   1    1.9      0.699                                                   HISTORY   1    2.0      0.721                                                   HISTORY   2    0.3      0.809      0.718      0.524                             HISTORY   2    0.4      0.637      0.578      0.423                             HISTORY   2    0.5      0.515      0.479      0.355                             HISTORY   2    0.6      0.427      0.406      0.306                             HISTORY   2    0.7      0.361      0.349      0.268                             HISTORY   2    0.8      0.311      0.304      0.238                             HISTORY   2    0.9      0.272      0.268      0.214                             HISTORY   2    1.0      0.240      0.239      0.194                             HISTORY   2    1.1      0.215      0.215      0.178                             HISTORY   2    1.2      0.194      0.195      0.164                             HISTORY   2    1.3      0.177      0.179      0.152                             HISTORY   2    1.4      0.163      0.165      0.142                             HISTORY   2    1.5      0.152      0.153      0.134                             HISTORY   2    1.6      0.142      0.144      0.127                             HISTORY   2    1.7      0.134      0.136      0.121                             HISTORY   2    1.8      0.127      0.129      0.116                             HISTORY   2    1.9      0.121      0.123      0.112                             HISTORY   2    2.0      0.117      0.119      0.108                             HISTORY   3    0.3      0.621      0.396      0.254                             HISTORY   3    0.4      0.470      0.318      0.199                             HISTORY   3    0.5      0.371      0.270      0.169                             HISTORY   3    0.6      0.304      0.237      0.149                             HISTORY   3    0.7      0.257      0.212      0.136                             HISTORY   3    0.8      0.223      0.193      0.126                             HISTORY   3    0.9      0.197      0.178      0.118                             HISTORY   3    1.0      0.177      0.166      0.113                             HISTORY   3    1.1      0.162      0.156      0.108                             HISTORY   3    1.2      0.150      0.148      0.104                             HISTORY   3    1.3      0.140      0.141      0.101                             HISTORY   3    1.4      0.132      0.135      0.099                             HISTORY   3    1.5      0.126      0.130      0.097                             HISTORY   3    1.6      0.121      0.126      0.095                             HISTORY   3    1.7      0.116      0.123      0.094                             HISTORY   3    1.8      0.113      0.121      0.093                             HISTORY   3    1.9      0.110      0.119      0.093                             HISTORY   3    2.0      0.108      0.118      0.092                             END