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 ---------------------------------------------------------------------------- ORB2900 40 15 130 1986-11-13T23:27:42.889Z 1986-11-13T23:37:30.889Z ORB2901 2 15 130 1986-11-14T23:46:45.720Z 1986-11-14T23:46:57.720Z ORB2903 1 15 130 1986-11-16T23:45:01.719Z 1986-11-16T23:45:01.719Z ORB2905 1 15 130 1986-11-18T23:43:51.199Z 1986-11-18T23:43:51.199Z ORB2939 16 15 130 1986-12-22T23:54:15.787Z 1986-12-22T23:57:15.787Z ORB2940 1 15 130 1986-12-23T23:45:38.949Z 1986-12-23T23:45:38.949Z ORB2941 1 15 130 1986-12-24T23:57:02.216Z 1986-12-24T23:57:02.216Z ORB2943 1 15 130 1986-12-26T23:46:29.300Z 1986-12-26T23:46:29.300Z ORB2945 2 15 130 1986-12-28T23:31:30.872Z 1986-12-28T23:33:06.872Z ORB2947 2 15 130 1986-12-30T23:49:57.540Z 1986-12-30T23:52:57.540Z ORB2953 1 15 130 1987-01-05T23:47:50.110Z 1987-01-05T23:47:50.110Z ORB2955 1 15 130 1987-01-07T23:46:47.416Z 1987-01-07T23:46:47.416Z ORB2960 1 15 130 1987-01-12T23:49:32.291Z 1987-01-12T23:49:32.291Z ORB2962 1 15 130 1987-01-14T23:54:01.534Z 1987-01-14T23:54:01.534Z ORB2969 1 15 130 1987-01-21T23:51:09.539Z 1987-01-21T23:51:09.539Z ORB2972 93 15 130 1987-01-24T23:46:52.962Z 1987-01-25T00:12:28.962Z ORB2973 3 15 130 1987-01-25T23:54:44.578Z 1987-01-25T23:55:20.578Z ORB2974 1 15 130 1987-01-26T23:44:36.741Z 1987-01-26T23:44:36.741Z ORB2975 10 15 130 1987-01-27T23:43:05.433Z 1987-01-28T00:09:05.433Z ORB2976 32 15 130 1987-01-28T23:55:58.634Z 1987-01-29T00:07:10.634Z ORB2979 141 15 130 1987-01-31T23:43:17.082Z 1987-02-01T00:17:17.082Z ORB2986 18 15 130 1987-02-08T00:07:11.297Z 1987-02-08T00:10:59.297Z ORB2987 2 15 130 1987-02-09T00:07:44.262Z 1987-02-09T00:08:56.262Z ORB2990 14 15 130 1987-02-11T23:46:11.960Z 1987-02-11T23:48:59.960Z ORB2992 32 15 130 1987-02-13T23:43:42.933Z 1987-02-14T00:24:42.933Z ORB2993 43 15 130 1987-02-14T23:42:40.447Z 1987-02-14T23:58:40.447Z ORB2994 29 15 130 1987-02-15T23:41:37.932Z 1987-02-16T00:25:37.932Z ORB2997 2 15 130 1987-02-18T23:54:29.884Z 1987-02-18T23:54:41.884Z 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.