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 ---------------------------------------------------------------------------- ORB0900 138 15 130 1981-05-24T01:56:08.365Z 1981-05-24T02:25:08.365Z ORB0901 119 15 130 1981-05-25T01:47:20.617Z 1981-05-25T02:12:32.617Z ORB0902 165 15 130 1981-05-26T01:48:32.274Z 1981-05-26T02:22:56.274Z ORB0903 172 15 130 1981-05-27T01:41:31.910Z 1981-05-27T02:15:43.910Z ORB0904 32 15 130 1981-05-28T01:56:07.376Z 1981-05-28T02:04:07.376Z ORB0905 197 15 130 1981-05-29T01:42:30.362Z 1981-05-29T02:24:06.362Z ORB0906 164 15 130 1981-05-30T01:40:53.041Z 1981-05-30T02:13:53.041Z ORB0907 85 15 130 1981-05-31T01:55:27.283Z 1981-05-31T02:13:15.283Z ORB0908 87 15 130 1981-06-01T01:41:37.306Z 1981-06-01T02:13:01.306Z ORB0909 141 15 130 1981-06-02T01:39:59.107Z 1981-06-02T02:11:35.107Z ORB0910 161 15 130 1981-06-03T01:40:32.706Z 1981-06-03T02:13:08.706Z ORB0911 107 15 130 1981-06-04T01:53:18.034Z 1981-06-04T02:14:54.034Z ORB0912 112 15 130 1981-06-05T01:51:27.229Z 1981-06-05T02:14:15.229Z ORB0913 115 15 130 1981-06-06T01:40:36.364Z 1981-06-06T02:04:00.364Z ORB0914 101 15 130 1981-06-07T01:53:21.366Z 1981-06-07T02:13:21.366Z ORB0915 197 15 130 1981-06-08T01:41:06.353Z 1981-06-08T02:24:30.353Z ORB0916 153 15 130 1981-06-09T01:38:39.283Z 1981-06-09T02:09:03.283Z ORB0917 148 15 130 1981-06-10T01:41:24.323Z 1981-06-10T02:10:48.323Z ORB0918 185 15 130 1981-06-11T01:45:09.390Z 1981-06-11T02:24:21.390Z ORB0919 96 15 130 1981-06-12T01:52:54.416Z 1981-06-12T02:11:54.416Z ORB0920 206 15 130 1981-06-13T01:37:15.616Z 1981-06-13T02:18:39.616Z ORB0921 230 15 130 1981-06-14T01:37:01.147Z 1981-06-14T02:22:49.147Z ORB0922 144 15 130 1981-06-15T01:36:46.787Z 1981-06-15T02:05:22.787Z ORB0923 97 15 130 1981-06-16T01:46:44.544Z 1981-06-16T02:06:20.544Z ORB0924 200 15 130 1981-06-17T01:36:18.632Z 1981-06-17T02:16:30.632Z ORB0925 126 15 130 1981-06-18T01:53:17.265Z 1981-06-18T02:20:05.265Z ORB0926 60 15 130 1981-06-19T01:52:40.194Z 1981-06-19T02:04:40.194Z ORB0927 176 15 130 1981-06-20T01:35:39.119Z 1981-06-20T02:11:03.119Z ORB0928 194 15 130 1981-06-21T01:36:02.636Z 1981-06-21T02:16:26.636Z ORB0929 173 15 130 1981-06-22T01:35:14.429Z 1981-06-22T02:10:02.429Z ORB0930 136 15 130 1981-06-23T01:52:14.737Z 1981-06-23T02:21:02.737Z ORB0931 173 15 130 1981-06-24T01:35:15.574Z 1981-06-24T02:10:03.574Z ORB0932 200 15 130 1981-06-25T01:38:16.784Z 1981-06-25T02:19:52.784Z ORB0933 96 15 130 1981-06-26T01:49:30.459Z 1981-06-26T02:08:42.459Z ORB0934 238 15 130 1981-06-27T01:34:20.703Z 1981-06-27T02:23:20.703Z ORB0935 74 15 130 1981-06-28T01:48:23.610Z 1981-06-28T02:03:35.610Z ORB0936 210 15 130 1981-06-29T01:34:02.996Z 1981-06-29T02:15:50.996Z ORB0937 204 15 130 1981-06-30T01:35:54.866Z 1981-06-30T02:17:06.866Z ORB0938 172 15 130 1981-07-01T01:33:46.384Z 1981-07-01T02:08:58.384Z ORB0939 113 15 130 1981-07-02T01:47:39.441Z 1981-07-02T02:12:15.441Z ORB0940 82 15 130 1981-07-03T01:49:57.090Z 1981-07-03T02:06:21.090Z ORB0941 179 15 130 1981-07-04T01:33:27.367Z 1981-07-04T02:09:27.367Z ORB0942 76 15 130 1981-07-05T01:49:58.262Z 1981-07-05T02:04:58.262Z ORB0943 103 15 130 1981-07-06T01:35:17.664Z 1981-07-06T01:55:41.664Z ORB0944 109 15 130 1981-07-07T01:36:25.714Z 1981-07-07T01:58:13.714Z ORB0945 109 15 130 1981-07-08T01:49:34.440Z 1981-07-08T02:11:34.440Z ORB0946 99 15 130 1981-07-09T01:49:43.725Z 1981-07-09T02:10:31.725Z ORB0947 114 15 130 1981-07-10T01:49:29.593Z 1981-07-10T02:13:17.593Z ORB0948 208 15 130 1981-07-11T01:33:04.080Z 1981-07-11T02:20:52.080Z ORB0949 64 15 130 1981-07-12T01:50:27.093Z 1981-07-12T02:06:15.093Z ORB0950 147 15 130 1981-07-13T01:50:26.740Z 1981-07-13T02:20:50.740Z ORB0951 101 15 130 1981-07-14T01:49:02.791Z 1981-07-14T02:09:38.791Z ORB0952 235 15 130 1981-07-15T01:33:15.364Z 1981-07-15T02:21:15.364Z ORB0953 106 15 130 1981-07-16T01:49:28.776Z 1981-07-16T02:12:40.776Z ORB0954 204 15 130 1981-07-17T01:33:54.507Z 1981-07-17T02:15:42.507Z ORB0955 228 15 130 1981-07-18T01:33:32.722Z 1981-07-18T02:21:32.722Z ORB0956 102 15 130 1981-07-19T01:47:59.423Z 1981-07-19T02:10:23.423Z ORB0957 214 15 130 1981-07-20T01:35:26.785Z 1981-07-20T02:20:50.785Z ORB0958 62 15 130 1981-07-21T01:51:18.047Z 1981-07-21T02:13:42.047Z ORB0959 228 15 130 1981-07-22T01:34:09.977Z 1981-07-22T02:21:45.977Z ORB0960 107 15 130 1981-07-23T01:50:38.309Z 1981-07-23T02:13:14.309Z ORB0961 195 15 130 1981-07-24T01:33:31.255Z 1981-07-24T02:19:55.255Z ORB0962 233 15 130 1981-07-25T01:33:36.341Z 1981-07-25T02:22:36.341Z ORB0963 164 15 130 1981-07-26T01:33:53.541Z 1981-07-26T02:18:41.541Z ORB0964 154 15 130 1981-07-27T01:33:59.063Z 1981-07-27T02:22:23.063Z ORB0965 126 15 130 1981-07-28T01:48:28.797Z 1981-07-28T02:15:16.797Z ORB0966 225 15 130 1981-07-29T01:33:58.718Z 1981-07-29T02:20:46.718Z ORB0967 150 15 130 1981-07-30T01:34:04.767Z 1981-07-30T02:06:40.767Z ORB0968 74 15 130 1981-07-31T01:49:58.940Z 1981-07-31T02:10:22.940Z ORB0969 218 15 130 1981-08-01T01:34:17.203Z 1981-08-01T02:20:05.203Z ORB0970 94 15 130 1981-08-02T01:48:47.528Z 1981-08-02T02:09:35.528Z ORB0971 228 15 130 1981-08-03T01:34:41.828Z 1981-08-03T02:21:41.828Z ORB0972 40 15 130 1981-08-04T01:52:12.175Z 1981-08-04T02:11:24.175Z ORB0973 227 15 130 1981-08-05T01:34:54.345Z 1981-08-05T02:22:06.345Z ORB0974 80 15 130 1981-08-06T01:49:36.504Z 1981-08-06T02:14:12.504Z ORB0975 83 15 130 1981-08-07T01:55:30.505Z 1981-08-07T02:14:54.505Z ORB0976 228 15 130 1981-08-08T01:35:24.397Z 1981-08-08T02:23:48.397Z ORB0977 93 15 130 1981-08-09T01:54:06.162Z 1981-08-09T02:13:18.162Z ORB0978 182 15 130 1981-08-10T01:35:23.943Z 1981-08-10T02:24:11.943Z ORB0979 115 15 130 1981-08-11T01:50:40.702Z 1981-08-11T02:14:04.702Z ORB0981 88 15 130 1981-08-13T01:51:02.233Z 1981-08-13T02:11:50.233Z ORB0982 92 15 130 1981-08-14T01:53:30.517Z 1981-08-14T02:17:54.517Z ORB0983 211 15 130 1981-08-15T01:35:46.412Z 1981-08-15T02:23:58.412Z ORB0984 78 15 130 1981-08-16T01:49:37.942Z 1981-08-16T02:11:01.942Z ORB0985 229 15 130 1981-08-17T01:36:17.015Z 1981-08-17T02:24:17.015Z ORB0986 57 15 130 1981-08-18T01:57:07.670Z 1981-08-18T02:09:43.670Z ORB0988 112 15 130 1981-08-20T01:54:47.605Z 1981-08-20T02:18:35.605Z ORB0989 64 15 130 1981-08-21T01:56:00.819Z 1981-08-21T02:11:00.819Z ORB0990 217 15 130 1981-08-22T01:36:49.543Z 1981-08-22T02:22:37.543Z ORB0991 3 15 130 1981-08-23T02:02:49.708Z 1981-08-23T02:10:25.708Z ORB0992 38 15 130 1981-08-24T01:58:49.382Z 1981-08-24T02:12:01.382Z ORB0993 103 15 130 1981-08-25T01:49:00.390Z 1981-08-25T02:10:24.390Z ORB0997 151 15 130 1981-08-29T01:44:01.114Z 1981-08-29T02:15:01.114Z ORB0998 147 15 130 1981-08-30T01:39:56.446Z 1981-08-30T02:10:08.446Z ORB0999 99 15 130 1981-08-31T01:45:27.245Z 1981-08-31T02:05:03.245Z 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.