PVO Ion Mass Spectrometer high-resolution data are stored in single-orbit ASCII files. 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 (*.LBL). Columns in all data files: ======================================================= name type description ------------------------------------------------------- PVO TIME char 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 DWELL int Dwell time (time interval between samples, msec) DWELL = (TIME - UT)*1000/(n-1) BITS int Telemetry bit rate LAT float Venusian Latitude LON float Venusian Longitude ALT float Altitude SZA float Solar Zenith Angle SHA float Solar Hour Angle
MASS1 int Mass of Sample 1 DEN1 float Number density of Sample 1 MASS2 int Mass of Sample 2 DEN2 float Number density of Sample 2 . . . . . . . . . MASS55 int Mass of Sample 55 DEN55 float Number density of Sample 55 The values 999 and 9.9999e+04 are the missing data values for mass and density respectively. The value 99999.999 is the missing data value for the second-of-day part of the time column. Negative values in a density column indicate flagged (unreliable) data values. Data Files (.TAB extension) The high-resolution data files on this disk are ASCII table files, each having 118 columns and record length 953 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 218 118 953 1981-05-24T01:36:39.673Z 1981-05-24T02:16:02.134Z ORB0901 201 118 953 1981-05-25T01:36:26.470Z 1981-05-25T01:59:31.511Z ORB0902 218 118 953 1981-05-26T01:36:16.368Z 1981-05-26T02:15:38.228Z ORB0903 201 118 953 1981-05-27T01:35:57.969Z 1981-05-27T01:58:12.167Z ORB0904 197 118 953 1981-05-28T01:35:59.319Z 1981-05-28T02:12:29.034Z ORB0905 218 118 953 1981-05-29T01:35:34.919Z 1981-05-29T02:15:35.905Z ORB0906 201 118 953 1981-05-30T01:35:20.273Z 1981-05-30T01:57:58.030Z ORB0907 218 118 953 1981-05-31T01:35:06.381Z 1981-05-31T02:14:30.540Z ORB0908 218 118 953 1981-06-01T01:34:54.984Z 1981-06-01T02:01:52.834Z ORB0909 201 118 953 1981-06-02T01:34:45.837Z 1981-06-02T02:11:28.349Z ORB0910 201 118 953 1981-06-03T01:34:25.531Z 1981-06-03T01:57:06.099Z ORB0911 218 118 953 1981-06-04T01:34:30.293Z 1981-06-04T02:33:26.318Z ORB0912 218 118 953 1981-06-05T01:33:51.894Z 1981-06-05T02:13:06.553Z ORB0913 184 118 953 1981-06-06T01:33:43.749Z 1981-06-06T02:04:17.509Z ORB0914 218 118 953 1981-06-07T01:33:41.851Z 1981-06-07T02:32:37.125Z ORB0915 201 118 953 1981-06-08T01:33:14.709Z 1981-06-08T02:05:51.848Z ORB0916 218 118 953 1981-06-09T01:32:51.361Z 1981-06-09T01:55:38.572Z ORB0917 218 118 953 1981-06-10T01:32:41.827Z 1981-06-10T01:55:28.938Z ORB0918 218 118 953 1981-06-11T01:32:27.041Z 1981-06-11T02:12:08.303Z ORB0919 218 118 953 1981-06-12T01:32:27.648Z 1981-06-12T02:29:18.920Z ORB0920 218 118 953 1981-06-13T01:31:52.804Z 1981-06-13T01:56:48.169Z ORB0921 218 118 953 1981-06-14T01:31:40.717Z 1981-06-14T01:54:27.826Z ORB0922 218 118 953 1981-06-15T01:31:23.230Z 1981-06-15T01:54:10.434Z ORB0923 218 118 953 1981-06-16T01:31:12.098Z 1981-06-16T02:10:44.966Z ORB0924 218 118 953 1981-06-17T01:30:57.961Z 1981-06-17T01:56:09.203Z ORB0925 218 118 953 1981-06-18T01:30:49.576Z 1981-06-18T02:12:50.597Z ORB0926 209 118 953 1981-06-19T01:30:48.189Z 1981-06-19T02:30:12.213Z ORB0927 218 118 953 1981-06-20T01:30:19.091Z 1981-06-20T01:55:31.450Z ORB0928 201 118 953 1981-06-21T01:30:07.402Z 1981-06-21T02:06:40.867Z ORB0929 201 118 953 1981-06-22T01:29:55.761Z 1981-06-22T01:52:17.215Z ORB0930 218 118 953 1981-06-23T01:29:42.124Z 1981-06-23T02:09:21.365Z ORB0931 201 118 953 1981-06-24T01:29:30.430Z 1981-06-24T01:52:05.471Z ORB0932 201 118 953 1981-06-25T01:29:27.336Z 1981-06-25T02:07:32.867Z ORB0933 218 118 953 1981-06-26T01:29:22.941Z 1981-06-26T02:25:54.963Z ORB0934 218 118 953 1981-06-27T01:28:58.042Z 1981-06-27T01:54:39.544Z ORB0935 213 118 953 1981-06-28T01:29:03.151Z 1981-06-28T02:25:10.425Z ORB0936 201 118 953 1981-06-29T01:28:42.654Z 1981-06-29T01:49:42.712Z ORB0937 218 118 953 1981-06-30T01:28:33.116Z 1981-06-30T01:51:20.113Z ORB0938 218 118 953 1981-07-01T01:28:22.619Z 1981-07-01T01:53:37.474Z ORB0939 201 118 953 1981-07-02T01:28:34.312Z 1981-07-02T02:11:59.095Z ORB0940 218 118 953 1981-07-03T01:28:12.435Z 1981-07-03T02:19:40.914Z ORB0941 218 118 953 1981-07-04T01:28:06.433Z 1981-07-04T01:52:36.906Z ORB0942 201 118 953 1981-07-05T01:28:06.624Z 1981-07-05T02:12:31.906Z ORB0943 173 118 953 1981-07-06T01:27:55.987Z 1981-07-06T01:55:20.706Z ORB0944 218 118 953 1981-07-07T01:27:51.589Z 1981-07-07T01:52:15.333Z ORB0945 218 118 953 1981-07-08T01:27:48.194Z 1981-07-08T01:51:26.149Z ORB0946 218 118 953 1981-07-09T01:28:02.542Z 1981-07-09T02:21:03.280Z ORB0947 218 118 953 1981-07-10T01:27:51.877Z 1981-07-10T02:18:21.172Z ORB0948 201 118 953 1981-07-11T01:27:41.233Z 1981-07-11T01:59:40.504Z ORB0949 235 118 953 1981-07-12T01:27:39.583Z 1981-07-12T02:22:47.886Z ORB0950 218 118 953 1981-07-13T01:49:16.967Z 1981-07-13T02:21:12.935Z ORB0951 218 118 953 1981-07-14T01:27:52.018Z 1981-07-14T02:17:48.334Z ORB0952 218 118 953 1981-07-15T01:27:47.417Z 1981-07-15T02:01:57.896Z ORB0953 218 118 953 1981-07-16T01:27:47.228Z 1981-07-16T02:19:03.026Z ORB0954 218 118 953 1981-07-17T01:27:50.123Z 1981-07-17T02:02:01.384Z ORB0955 218 118 953 1981-07-18T01:27:55.194Z 1981-07-18T02:02:15.463Z ORB0956 201 118 953 1981-07-19T01:27:51.283Z 1981-07-19T02:21:36.347Z ORB0957 201 118 953 1981-07-20T01:27:52.230Z 1981-07-20T01:48:52.288Z ORB0958 201 118 953 1981-07-21T01:28:11.254Z 1981-07-21T02:15:33.806Z ORB0959 218 118 953 1981-07-22T01:28:04.886Z 1981-07-22T02:03:40.842Z ORB0960 201 118 953 1981-07-23T01:28:15.249Z 1981-07-23T02:26:33.476Z ORB0961 201 118 953 1981-07-24T01:28:09.375Z 1981-07-24T02:01:41.619Z ORB0962 218 118 953 1981-07-25T01:28:21.228Z 1981-07-25T02:02:29.979Z ORB0963 218 118 953 1981-07-26T01:28:19.788Z 1981-07-26T02:04:42.542Z ORB0964 201 118 953 1981-07-27T01:28:31.588Z 1981-07-27T02:11:37.211Z ORB0965 218 118 953 1981-07-28T01:28:45.761Z 1981-07-28T02:21:47.810Z ORB0966 218 118 953 1981-07-29T01:28:40.147Z 1981-07-29T02:02:07.881Z ORB0967 201 118 953 1981-07-30T01:28:43.646Z 1981-07-30T01:52:09.010Z ORB0968 218 118 953 1981-07-31T01:28:48.074Z 1981-07-31T02:21:11.084Z ORB0969 218 118 953 1981-08-01T01:28:53.703Z 1981-08-01T02:03:22.176Z ORB0970 201 118 953 1981-08-02T01:29:06.263Z 1981-08-02T02:16:26.819Z ORB0971 201 118 953 1981-08-03T01:29:11.393Z 1981-08-03T01:58:22.603Z ORB0972 201 118 953 1981-08-04T01:29:13.475Z 1981-08-04T02:25:25.487Z ORB0973 201 118 953 1981-08-05T01:29:26.058Z 1981-08-05T01:58:20.042Z ORB0974 217 118 953 1981-08-06T01:29:43.128Z 1981-08-06T02:28:19.164Z ORB0975 218 118 953 1981-08-07T01:29:34.714Z 1981-08-07T02:22:49.769Z ORB0976 218 118 953 1981-08-08T01:29:40.700Z 1981-08-08T02:01:11.321Z ORB0977 201 118 953 1981-08-09T01:29:49.425Z 1981-08-09T02:19:10.941Z ORB0978 201 118 953 1981-08-10T01:29:55.133Z 1981-08-10T02:00:06.248Z ORB0979 218 118 953 1981-08-11T01:30:08.352Z 1981-08-11T02:28:18.839Z ORB0981 218 118 953 1981-08-13T01:30:16.996Z 1981-08-13T02:29:21.513Z ORB0982 201 118 953 1981-08-14T01:30:10.074Z 1981-08-14T02:22:30.103Z ORB0983 201 118 953 1981-08-15T01:30:18.707Z 1981-08-15T02:00:02.207Z ORB0984 201 118 953 1981-08-16T01:30:17.780Z 1981-08-16T02:17:44.325Z ORB0985 201 118 953 1981-08-17T01:30:24.847Z 1981-08-17T02:01:07.647Z ORB0986 201 118 953 1981-08-18T01:30:23.919Z 1981-08-18T02:17:50.490Z ORB0987 92 118 953 1981-08-19T01:30:25.054Z 1981-08-19T02:28:04.075Z ORB0988 201 118 953 1981-08-20T01:30:24.139Z 1981-08-20T02:21:19.656Z ORB0989 201 118 953 1981-08-21T01:30:29.205Z 1981-08-21T02:22:46.233Z ORB0990 201 118 953 1981-08-22T01:30:31.772Z 1981-08-22T02:00:06.783Z ORB0991 201 118 953 1981-08-23T01:30:38.836Z 1981-08-23T02:18:58.148Z ORB0992 218 118 953 1981-08-24T01:30:30.410Z 1981-08-24T01:53:17.119Z ORB0993 218 118 953 1981-08-25T01:30:34.795Z 1981-08-25T02:14:29.813Z ORB0997 201 118 953 1981-08-29T01:30:15.928Z 1981-08-29T01:51:15.836Z ORB0998 218 118 953 1981-08-30T01:30:08.712Z 1981-08-30T02:14:03.729Z ORB0999 218 118 953 1981-08-31T01:30:04.383Z 1981-08-31T01:52:52.301Z 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.