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 ---------------------------------------------------------------------------- ORB0800 53 15 130 1981-02-13T00:13:02.515Z 1981-02-13T00:25:26.515Z ORB0801 1 15 130 1981-02-13T23:53:47.280Z 1981-02-13T23:53:47.280Z ORB0802 1 15 130 1981-02-14T23:58:19.872Z 1981-02-14T23:58:19.872Z ORB0803 96 15 130 1981-02-16T00:13:40.385Z 1981-02-16T00:32:40.385Z ORB0804 68 15 130 1981-02-17T00:13:25.327Z 1981-02-17T00:26:49.327Z ORB0805 134 15 130 1981-02-18T00:12:10.023Z 1981-02-18T00:40:22.023Z ORB0806 107 15 130 1981-02-18T23:59:54.808Z 1981-02-19T00:29:06.809Z ORB0807 37 15 130 1981-02-20T00:20:27.766Z 1981-02-20T00:27:39.766Z ORB0808 141 15 130 1981-02-21T00:15:12.749Z 1981-02-21T00:45:36.749Z ORB0811 66 15 130 1981-02-24T00:18:53.237Z 1981-02-24T00:31:53.237Z ORB0812 163 15 130 1981-02-25T00:16:51.251Z 1981-02-25T00:52:03.251Z ORB0813 142 15 130 1981-02-26T00:21:13.411Z 1981-02-26T00:53:13.411Z ORB0814 130 15 130 1981-02-27T00:13:12.441Z 1981-02-27T00:39:48.441Z ORB0815 149 15 130 1981-02-28T00:10:35.587Z 1981-02-28T00:45:23.587Z ORB0816 142 15 130 1981-03-01T00:12:23.070Z 1981-03-01T00:55:23.070Z ORB0817 211 15 130 1981-03-02T00:14:58.986Z 1981-03-02T00:59:34.986Z ORB0818 84 15 130 1981-03-03T00:26:47.338Z 1981-03-03T00:43:47.338Z ORB0820 55 15 130 1981-03-05T00:32:01.328Z 1981-03-05T00:42:49.328Z ORB0821 210 15 130 1981-03-06T00:17:15.079Z 1981-03-06T01:00:27.079Z ORB0822 52 15 130 1981-03-07T00:38:17.307Z 1981-03-07T00:49:41.307Z ORB0823 35 15 130 1981-03-08T00:33:44.102Z 1981-03-08T00:47:56.102Z ORB0824 61 15 130 1981-03-09T00:36:35.613Z 1981-03-09T00:49:35.613Z ORB0825 1 15 130 1981-03-10T00:42:03.159Z 1981-03-10T00:42:03.159Z ORB0826 131 15 130 1981-03-11T00:40:31.727Z 1981-03-11T01:08:31.727Z ORB0827 137 15 130 1981-03-12T00:38:00.582Z 1981-03-12T01:07:48.582Z ORB0828 41 15 130 1981-03-13T00:35:41.991Z 1981-03-13T00:45:17.991Z ORB0829 74 15 130 1981-03-14T00:33:48.217Z 1981-03-14T00:49:00.217Z ORB0830 1 15 130 1981-03-15T00:53:07.036Z 1981-03-15T00:53:07.036Z ORB0831 119 15 130 1981-03-16T00:38:00.842Z 1981-03-16T01:01:36.842Z ORB0832 2 15 130 1981-03-17T01:10:56.652Z 1981-03-17T01:11:08.652Z ORB0833 2 15 130 1981-03-18T01:18:40.981Z 1981-03-18T01:18:52.981Z ORB0834 54 15 130 1981-03-19T00:47:37.899Z 1981-03-19T01:03:25.899Z ORB0873 1 15 130 1981-04-27T01:47:48.769Z 1981-04-27T01:47:48.769Z ORB0874 77 15 130 1981-04-28T01:46:16.293Z 1981-04-28T02:03:28.293Z ORB0875 118 15 130 1981-04-29T01:40:19.376Z 1981-04-29T02:12:55.376Z ORB0876 74 15 130 1981-04-30T01:48:42.842Z 1981-04-30T02:04:30.842Z ORB0877 93 15 130 1981-05-01T01:43:09.536Z 1981-05-01T02:09:33.536Z ORB0878 150 15 130 1981-05-02T01:41:47.725Z 1981-05-02T02:12:11.725Z ORB0879 190 15 130 1981-05-03T01:44:49.143Z 1981-05-03T02:25:37.143Z ORB0880 152 15 130 1981-05-04T01:43:38.509Z 1981-05-04T02:14:02.509Z ORB0881 148 15 130 1981-05-05T01:41:39.070Z 1981-05-05T02:11:03.070Z ORB0882 244 15 130 1981-05-06T01:42:27.057Z 1981-05-06T02:31:39.057Z ORB0883 76 15 130 1981-05-07T01:58:37.758Z 1981-05-07T02:18:25.758Z ORB0884 116 15 130 1981-05-08T01:53:48.972Z 1981-05-08T02:18:36.972Z ORB0885 170 15 130 1981-05-09T01:55:10.239Z 1981-05-09T02:32:22.239Z ORB0886 102 15 130 1981-05-10T01:48:07.092Z 1981-05-10T02:10:55.092Z ORB0887 176 15 130 1981-05-11T01:43:39.190Z 1981-05-11T02:18:51.190Z ORB0888 102 15 130 1981-05-12T01:54:10.984Z 1981-05-12T02:15:46.984Z ORB0889 144 15 130 1981-05-13T01:45:06.253Z 1981-05-13T02:25:42.253Z ORB0890 132 15 130 1981-05-14T01:43:36.381Z 1981-05-14T02:31:48.381Z ORB0892 132 15 130 1981-05-16T01:43:47.633Z 1981-05-16T02:10:23.633Z ORB0893 129 15 130 1981-05-17T01:43:40.196Z 1981-05-17T02:09:16.196Z ORB0894 147 15 130 1981-05-18T01:44:08.166Z 1981-05-18T02:13:32.166Z ORB0895 96 15 130 1981-05-19T01:56:59.566Z 1981-05-19T02:15:59.566Z ORB0896 151 15 130 1981-05-20T01:43:38.376Z 1981-05-20T02:14:38.376Z ORB0897 129 15 130 1981-05-21T01:56:28.742Z 1981-05-21T02:23:52.742Z ORB0898 128 15 130 1981-05-22T01:45:42.464Z 1981-05-22T02:11:42.464Z ORB0899 167 15 130 1981-05-23T01:42:55.625Z 1981-05-23T02:16:31.625Z 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.