PVO Ion Mass Spectrometer low-resolution data are stored in single-orbit ASCII files. These files can be converted to UADS-compliant file structures by concatenation of the UADS_HDR.TXT file with an individual data file (header first!). All of the data files have the same internal structure, which is described by the single format file OIMSDATA.FMT. File structure characteristics which may vary from file to file (# of records, start/stop time, etc.) are described in the individual PDS label files. /-------------------------\ | D A T A | \-------------------------/ Columns in all data files: ===================================================== name type description ----------------------------------------------------- PVO TIME int Date and time in format YYDOY FSEC, where YY is the year, DOY is the day-of-year & FSEC is the decimal second-of-day ORBIT integer PVO orbit number PERISECS float Seconds after periapsis (negative before periapsis) DEN_1 integer Number density of 1 AMU particles DEN_2 integer Number density of 2 AMU particles DEN_4 integer Number density of 4 AMU particles DEN_8 integer Number density of 8 AMU particles DEN_12 integer Number density of 12 AMU particles DEN_14 integer Number density of 14 AMU particles DEN_16 integer Number density of 16 AMU particles DEN_18 integer Number density of 18 AMU particles DEN_28 integer Number density of 28 AMU particles DEN_30 integer Number density of 30 AMU particles DEN_32 integer Number density of 32 AMU particles DEN_44 integer Number density of 44 AMU particles Any number density data item whose value equals -999999 is a missing data value. Missing data values in the seconds-after-periapsis column are indicated by the value -9999.999. Data Files (.TAB extension) The high-resolution data files on this disk are ASCII table files, each having 15 columns and record length 130 bytes. Information about the individual files (number of records, start and stop times, etc.) can be obtained from the PDS label file accompanying each *.TAB file. This label file has the same filename as the data file but with .TAB replaced by .LBL. List of data files: ============================================================================ Name Records Cols Len Start Stop ---------------------------------------------------------------------------- ORB0400 25 15 130 1980-01-09T07:07:19.168Z 1980-01-09T07:19:31.168Z ORB0401 215 15 130 1980-01-10T06:36:40.218Z 1980-01-10T07:19:28.218Z ORB0402 173 15 130 1980-01-11T06:57:03.646Z 1980-01-11T07:32:03.646Z ORB0403 170 15 130 1980-01-12T06:58:31.144Z 1980-01-12T07:33:31.144Z ORB0405 152 15 130 1980-01-14T07:11:37.646Z 1980-01-14T07:42:25.646Z ORB0407 86 15 130 1980-01-16T07:22:59.344Z 1980-01-16T08:00:11.344Z ORB0408 139 15 130 1980-01-17T07:30:21.754Z 1980-01-17T07:57:57.754Z ORB0409 73 15 130 1980-01-18T07:34:07.058Z 1980-01-18T07:48:31.058Z ORB0410 163 15 130 1980-01-19T07:36:30.806Z 1980-01-19T08:08:54.806Z ORB0411 161 15 130 1980-01-20T07:34:12.636Z 1980-01-20T08:06:12.636Z ORB0412 161 15 130 1980-01-21T07:37:50.280Z 1980-01-21T08:09:50.280Z ORB0413 154 15 130 1980-01-22T07:41:36.682Z 1980-01-22T08:12:48.682Z ORB0414 106 15 130 1980-01-23T07:44:45.408Z 1980-01-23T08:25:57.408Z ORB0415 177 15 130 1980-01-24T07:48:53.134Z 1980-01-24T08:25:53.134Z ORB0416 146 15 130 1980-01-25T07:52:12.030Z 1980-01-25T08:21:12.030Z ORB0417 195 15 130 1980-01-26T07:50:15.068Z 1980-01-26T08:29:27.068Z ORB0418 117 15 130 1980-01-27T07:52:17.832Z 1980-01-27T08:15:41.832Z ORB0419 120 15 130 1980-01-28T07:57:35.380Z 1980-01-28T08:21:23.380Z ORB0420 84 15 130 1980-01-29T08:00:09.736Z 1980-01-29T08:16:45.736Z ORB0421 118 15 130 1980-01-30T07:58:18.240Z 1980-01-30T08:21:42.240Z ORB0422 165 15 130 1980-01-31T07:53:25.232Z 1980-01-31T08:26:25.232Z ORB0423 124 15 130 1980-02-01T07:49:01.114Z 1980-02-01T08:13:37.114Z ORB0424 154 15 130 1980-02-02T07:45:46.914Z 1980-02-02T08:16:22.914Z ORB0425 181 15 130 1980-02-03T07:55:21.196Z 1980-02-03T08:31:21.196Z ORB0426 108 15 130 1980-02-04T07:54:34.450Z 1980-02-04T08:15:58.450Z ORB0427 145 15 130 1980-02-05T07:40:16.058Z 1980-02-05T08:09:04.058Z ORB0428 233 15 130 1980-02-06T07:39:09.188Z 1980-02-06T08:25:33.188Z ORB0429 134 15 130 1980-02-07T07:57:37.820Z 1980-02-07T08:24:37.820Z ORB0430 138 15 130 1980-02-08T07:58:19.226Z 1980-02-08T08:25:43.226Z ORB0431 208 15 130 1980-02-09T07:54:07.792Z 1980-02-09T08:35:31.792Z ORB0432 140 15 130 1980-02-10T08:01:27.820Z 1980-02-10T08:29:15.820Z ORB0433 168 15 130 1980-02-11T08:15:31.682Z 1980-02-11T08:49:19.682Z ORB0434 105 15 130 1980-02-12T08:15:19.564Z 1980-02-12T08:36:19.564Z ORB0435 156 15 130 1980-02-13T08:26:51.838Z 1980-02-13T08:58:03.838Z ORB0437 194 15 130 1980-02-15T08:21:45.582Z 1980-02-15T09:00:21.582Z ORB0438 83 15 130 1980-02-16T08:40:07.224Z 1980-02-16T08:56:31.224Z ORB0439 193 15 130 1980-02-17T08:29:25.290Z 1980-02-17T09:09:37.290Z ORB0440 150 15 130 1980-02-18T08:34:15.830Z 1980-02-18T09:04:03.830Z ORB0441 246 15 130 1980-02-19T08:38:02.932Z 1980-02-19T09:27:14.932Z ORB0442 199 15 130 1980-02-20T08:49:10.544Z 1980-02-20T09:30:10.544Z ORB0443 195 15 130 1980-02-21T08:54:02.576Z 1980-02-21T09:35:02.576Z ORB0494 215 15 130 1980-04-12T10:35:05.408Z 1980-04-12T11:17:53.408Z ORB0495 188 15 130 1980-04-13T10:35:22.076Z 1980-04-13T11:12:46.076Z ORB0496 147 15 130 1980-04-14T10:34:02.816Z 1980-04-14T11:10:38.816Z ORB0497 186 15 130 1980-04-15T10:33:43.944Z 1980-04-15T11:10:55.944Z ORB0498 180 15 130 1980-04-16T10:33:23.372Z 1980-04-16T11:09:11.372Z ORB0499 236 15 130 1980-04-17T10:32:46.020Z 1980-04-17T11:19:46.020Z Catalog Files (.CAT extension) Catalog data, which includes instrument, dataset, mission and spacecraft descriptions, can be found in the *.CAT files in the CATALOG directory on this disk.