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 ---------------------------------------------------------------------------- ORB2301 198 15 130 1985-03-24T22:12:01.469Z 1985-03-24T22:51:25.469Z ORB2302 15 15 130 1985-03-25T22:24:24.824Z 1985-03-25T22:28:48.824Z ORB2303 19 15 130 1985-03-26T22:24:12.669Z 1985-03-26T22:28:00.669Z ORB2304 88 15 130 1985-03-27T22:23:48.983Z 1985-03-27T22:44:36.983Z ORB2307 25 15 130 1985-03-30T22:22:04.766Z 1985-03-30T22:35:04.766Z ORB2308 12 15 130 1985-03-31T22:19:54.896Z 1985-03-31T22:30:30.896Z ORB2310 2 15 130 1985-04-02T22:20:00.140Z 1985-04-02T22:49:00.140Z ORB2311 6 15 130 1985-04-03T22:10:03.193Z 1985-04-03T22:25:39.193Z ORB2312 7 15 130 1985-04-04T22:12:06.493Z 1985-04-04T22:41:18.493Z ORB2314 17 15 130 1985-04-06T22:28:49.701Z 1985-04-06T22:32:25.701Z ORB2317 26 15 130 1985-04-09T22:25:01.539Z 1985-04-09T22:32:25.539Z ORB2318 75 15 130 1985-04-10T22:21:29.622Z 1985-04-10T22:37:17.622Z ORB2319 5 15 130 1985-04-11T22:32:45.718Z 1985-04-11T22:38:45.718Z ORB2321 21 15 130 1985-04-13T22:23:05.088Z 1985-04-13T22:31:05.088Z ORB2322 53 15 130 1985-04-14T22:13:21.914Z 1985-04-14T22:38:33.914Z ORB2323 5 15 130 1985-04-15T22:13:38.616Z 1985-04-15T22:25:50.616Z ORB2324 50 15 130 1985-04-16T22:23:55.162Z 1985-04-16T22:34:31.162Z ORB2325 103 15 130 1985-04-17T22:13:35.517Z 1985-04-17T22:33:59.517Z ORB2327 27 15 130 1985-04-19T22:25:31.534Z 1985-04-19T22:30:55.534Z ORB2329 24 15 130 1985-04-21T22:28:02.422Z 1985-04-21T22:45:50.422Z ORB2330 1 15 130 1985-04-22T22:19:41.371Z 1985-04-22T22:19:41.371Z ORB2331 21 15 130 1985-04-23T22:24:19.953Z 1985-04-23T22:35:07.953Z ORB2332 103 15 130 1985-04-24T22:15:46.142Z 1985-04-24T22:36:10.142Z ORB2333 1 15 130 1985-04-25T22:22:12.117Z 1985-04-25T22:22:12.117Z ORB2334 56 15 130 1985-04-26T22:26:01.457Z 1985-04-26T22:37:13.457Z ORB2335 11 15 130 1985-04-27T22:34:38.334Z 1985-04-27T22:47:02.334Z ORB2336 1 15 130 1985-04-28T22:47:26.730Z 1985-04-28T22:47:26.730Z ORB2337 53 15 130 1985-04-29T22:26:38.624Z 1985-04-29T22:37:26.624Z ORB2338 17 15 130 1985-04-30T22:30:50.001Z 1985-04-30T22:34:02.001Z ORB2339 24 15 130 1985-05-01T22:27:48.844Z 1985-05-01T22:58:12.844Z ORB2340 1 15 130 1985-05-02T23:00:47.140Z 1985-05-02T23:00:47.140Z ORB2342 1 15 130 1985-05-04T22:16:06.045Z 1985-05-04T22:16:06.045Z ORB2347 1 15 130 1985-05-09T22:23:07.104Z 1985-05-09T22:23:07.104Z ORB2349 46 15 130 1985-05-11T22:24:41.779Z 1985-05-11T22:45:29.779Z ORB2350 15 15 130 1985-05-12T22:32:34.233Z 1985-05-12T22:37:22.233Z ORB2351 2 15 130 1985-05-13T22:17:38.104Z 1985-05-13T22:44:14.104Z ORB2352 25 15 130 1985-05-14T22:24:53.400Z 1985-05-14T22:36:17.400Z ORB2356 35 15 130 1985-05-18T22:30:49.053Z 1985-05-18T22:49:01.053Z ORB2358 1 15 130 1985-05-20T22:51:37.758Z 1985-05-20T22:51:37.758Z ORB2362 1 15 130 1985-05-24T22:29:21.653Z 1985-05-24T22:29:21.653Z ORB2364 1 15 130 1985-05-26T22:55:29.202Z 1985-05-26T22:55:29.202Z ORB2365 1 15 130 1985-05-27T22:19:38.464Z 1985-05-27T22:19:38.464Z ORB2366 1 15 130 1985-05-28T22:53:23.421Z 1985-05-28T22:53:23.421Z ORB2370 1 15 130 1985-06-01T22:47:34.041Z 1985-06-01T22:47:34.041Z 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.