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 ---------------------------------------------------------------------------- ORB2803 1 15 130 1986-08-08T23:33:25.777Z 1986-08-08T23:33:25.777Z ORB2805 2 15 130 1986-08-10T23:31:43.390Z 1986-08-10T23:36:31.390Z ORB2808 1 15 130 1986-08-13T23:39:47.408Z 1986-08-13T23:39:47.408Z ORB2809 2 15 130 1986-08-14T23:30:11.904Z 1986-08-14T23:40:11.904Z ORB2810 1 15 130 1986-08-15T23:37:59.963Z 1986-08-15T23:37:59.963Z ORB2817 1 15 130 1986-08-22T23:36:38.218Z 1986-08-22T23:36:38.218Z ORB2820 1 15 130 1986-08-25T23:32:06.569Z 1986-08-25T23:32:06.569Z ORB2821 1 15 130 1986-08-26T23:31:39.606Z 1986-08-26T23:31:39.606Z ORB2859 66 15 130 1986-10-03T23:15:40.420Z 1986-10-03T23:37:52.420Z ORB2860 24 15 130 1986-10-04T23:24:16.073Z 1986-10-04T23:31:28.073Z ORB2861 4 15 130 1986-10-05T23:24:28.276Z 1986-10-05T23:27:16.276Z ORB2865 50 15 130 1986-10-09T23:20:34.242Z 1986-10-09T23:57:34.242Z ORB2866 75 15 130 1986-10-10T23:17:00.980Z 1986-10-10T23:45:00.980Z ORB2868 10 15 130 1986-10-12T23:29:31.781Z 1986-10-12T23:43:31.781Z ORB2869 3 15 130 1986-10-13T23:18:16.623Z 1986-10-13T23:26:52.623Z ORB2872 62 15 130 1986-10-16T23:19:09.254Z 1986-10-16T23:31:21.254Z ORB2873 62 15 130 1986-10-17T23:19:03.428Z 1986-10-17T23:31:15.428Z ORB2875 2 15 130 1986-10-19T23:26:52.548Z 1986-10-19T23:32:28.548Z ORB2881 16 15 130 1986-10-25T23:21:35.326Z 1986-10-25T23:44:47.326Z ORB2886 6 15 130 1986-10-30T23:43:35.745Z 1986-10-30T23:50:59.745Z ORB2893 2 15 130 1986-11-06T23:41:54.481Z 1986-11-06T23:48:06.481Z ORB2895 3 15 130 1986-11-08T23:31:39.906Z 1986-11-08T23:32:03.906Z 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.