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 ---------------------------------------------------------------------------- ORB2511 1 15 130 1985-10-20T22:34:37.046Z 1985-10-20T22:34:37.046Z ORB2512 4 15 130 1985-10-21T22:53:10.460Z 1985-10-21T22:57:10.460Z ORB2515 42 15 130 1985-10-24T22:47:30.162Z 1985-10-24T22:55:42.162Z ORB2516 1 15 130 1985-10-25T22:57:42.025Z 1985-10-25T22:57:42.025Z ORB2517 11 15 130 1985-10-26T22:54:09.140Z 1985-10-26T22:56:09.140Z ORB2518 104 15 130 1985-10-27T22:35:34.975Z 1985-10-27T22:57:58.975Z ORB2519 2 15 130 1985-10-28T22:48:37.420Z 1985-10-28T22:48:49.420Z ORB2523 44 15 130 1985-11-01T22:52:05.144Z 1985-11-01T23:06:41.144Z ORB2524 21 15 130 1985-11-02T22:51:10.502Z 1985-11-02T22:56:22.502Z ORB2525 117 15 130 1985-11-03T22:42:53.232Z 1985-11-03T23:07:53.232Z ORB2527 19 15 130 1985-11-05T22:53:06.823Z 1985-11-05T22:57:18.823Z ORB2529 47 15 130 1985-11-07T22:57:58.342Z 1985-11-07T23:18:46.342Z ORB2530 193 15 130 1985-11-08T22:39:30.769Z 1985-11-08T23:19:18.769Z ORB2531 102 15 130 1985-11-09T22:49:17.882Z 1985-11-09T23:18:17.882Z ORB2534 131 15 130 1985-11-12T22:48:15.131Z 1985-11-12T23:14:51.131Z ORB2536 2 15 130 1985-11-14T23:20:26.833Z 1985-11-14T23:20:38.833Z ORB2537 110 15 130 1985-11-15T22:49:51.051Z 1985-11-15T23:12:39.051Z ORB2538 1 15 130 1985-11-16T22:55:39.471Z 1985-11-16T22:55:39.471Z ORB2540 134 15 130 1985-11-18T22:51:28.785Z 1985-11-18T23:19:28.785Z ORB2543 33 15 130 1985-11-21T23:02:46.289Z 1985-11-21T23:12:58.289Z ORB2546 36 15 130 1985-11-24T22:55:10.389Z 1985-11-24T23:02:10.389Z ORB2550 29 15 130 1985-11-28T22:55:20.923Z 1985-11-28T23:01:32.923Z ORB2551 121 15 130 1985-11-29T22:54:56.053Z 1985-11-29T23:19:08.053Z ORB2552 2 15 130 1985-11-30T23:09:54.918Z 1985-11-30T23:11:06.918Z ORB2553 12 15 130 1985-12-01T23:06:41.490Z 1985-12-01T23:08:53.490Z ORB2556 91 15 130 1985-12-04T22:56:23.158Z 1985-12-04T23:22:23.158Z ORB2557 2 15 130 1985-12-05T23:11:00.674Z 1985-12-05T23:11:12.674Z ORB2559 61 15 130 1985-12-07T23:14:57.708Z 1985-12-07T23:28:45.708Z ORB2560 36 15 130 1985-12-08T23:01:55.531Z 1985-12-08T23:20:07.531Z ORB2561 133 15 130 1985-12-09T22:51:04.865Z 1985-12-09T23:20:16.865Z ORB2562 5 15 130 1985-12-10T23:08:13.690Z 1985-12-10T23:25:01.690Z ORB2563 1 15 130 1985-12-11T23:05:57.992Z 1985-12-11T23:05:57.992Z ORB2564 28 15 130 1985-12-12T23:09:17.756Z 1985-12-12T23:23:29.756Z ORB2566 131 15 130 1985-12-14T22:59:55.615Z 1985-12-14T23:26:07.615Z ORB2567 5 15 130 1985-12-15T22:59:49.691Z 1985-12-15T23:19:37.691Z ORB2568 2 15 130 1985-12-16T22:59:07.186Z 1985-12-16T22:59:19.186Z ORB2569 138 15 130 1985-12-17T23:01:48.094Z 1985-12-17T23:30:24.094Z ORB2571 154 15 130 1985-12-19T22:54:08.135Z 1985-12-19T23:32:08.135Z ORB2573 74 15 130 1985-12-21T23:01:01.801Z 1985-12-21T23:16:49.801Z ORB2574 1 15 130 1985-12-22T23:14:15.746Z 1985-12-22T23:14:15.746Z ORB2575 117 15 130 1985-12-23T23:02:29.105Z 1985-12-23T23:38:17.105Z 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.