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 ---------------------------------------------------------------------------- ORB4800 167 118 953 1992-01-27T00:07:55.917Z 1992-01-27T00:39:41.872Z ORB4801 269 118 953 1992-01-28T00:08:24.353Z 1992-01-28T01:06:52.623Z ORB4802 166 118 953 1992-01-29T00:08:14.039Z 1992-01-29T00:43:56.049Z ORB4803 275 118 953 1992-01-30T00:08:15.506Z 1992-01-30T01:06:59.525Z ORB4804 165 118 953 1992-01-31T00:08:28.971Z 1992-01-31T00:43:58.980Z ORB4805 267 118 953 1992-02-01T00:08:31.435Z 1992-02-01T01:07:07.456Z ORB4806 266 118 953 1992-02-02T00:08:19.902Z 1992-02-02T01:07:07.921Z ORB4807 164 118 953 1992-02-03T00:08:31.367Z 1992-02-03T00:44:13.375Z ORB4808 166 118 953 1992-02-04T00:08:31.825Z 1992-02-04T00:43:48.833Z ORB4809 273 118 953 1992-02-05T00:08:30.282Z 1992-02-05T01:07:06.301Z ORB4810 280 118 953 1992-02-06T00:07:51.745Z 1992-02-06T01:07:04.764Z ORB4811 168 118 953 1992-02-07T00:08:02.211Z 1992-02-07T00:43:57.219Z ORB4812 160 118 953 1992-02-08T00:08:50.675Z 1992-02-08T00:44:06.689Z ORB4813 170 118 953 1992-02-09T00:07:44.132Z 1992-02-09T00:43:52.149Z ORB4814 167 118 953 1992-02-10T00:08:18.590Z 1992-02-10T00:43:35.601Z ORB4815 74 118 953 1992-02-11T00:30:00.290Z 1992-02-11T00:42:07.784Z ORB4816 172 118 953 1992-02-12T00:07:19.241Z 1992-02-12T00:43:39.253Z ORB4817 72 118 953 1992-02-13T00:30:07.947Z 1992-02-13T00:41:56.716Z ORB4818 264 118 953 1992-02-14T00:09:00.144Z 1992-02-14T01:06:32.163Z ORB4819 274 118 953 1992-02-15T00:07:59.600Z 1992-02-15T01:06:34.619Z ORB4820 272 118 953 1992-02-16T00:09:18.064Z 1992-02-16T01:06:25.083Z ORB4821 175 118 953 1992-02-17T00:08:00.781Z 1992-02-17T00:41:29.759Z ORB4822 294 118 953 1992-02-18T00:06:50.486Z 1992-02-18T01:06:07.505Z ORB4823 293 118 953 1992-02-19T00:07:07.887Z 1992-02-19T01:05:59.907Z ORB4824 288 118 953 1992-02-20T00:07:23.356Z 1992-02-20T01:05:51.374Z ORB4826 290 118 953 1992-02-22T00:06:53.295Z 1992-02-22T01:05:33.313Z ORB4827 289 118 953 1992-02-23T00:06:17.733Z 1992-02-23T01:05:23.001Z ORB4828 293 118 953 1992-02-24T00:05:54.421Z 1992-02-24T01:05:12.689Z ORB4829 179 118 953 1992-02-25T00:06:34.079Z 1992-02-25T00:40:25.023Z ORB4830 71 118 953 1992-02-26T00:28:53.260Z 1992-02-26T00:40:13.503Z ORB4831 180 118 953 1992-02-27T00:05:20.997Z 1992-02-27T00:40:01.969Z ORB4832 566 118 953 1992-02-28T00:05:11.706Z 1992-02-28T01:04:37.725Z ORB4833 12 118 953 1992-02-29T00:04:56.107Z 1992-02-29T00:07:15.109Z ORB4834 290 118 953 1992-03-01T00:05:20.569Z 1992-03-01T01:04:00.838Z ORB4835 216 118 953 1992-03-02T00:04:58.198Z 1992-03-02T01:03:49.223Z ORB4836 222 118 953 1992-03-03T00:04:43.651Z 1992-03-03T01:03:35.427Z ORB4837 78 118 953 1992-03-04T00:26:38.106Z 1992-03-04T00:38:45.600Z ORB4838 198 118 953 1992-03-05T00:04:16.061Z 1992-03-05T01:03:07.087Z ORB4839 72 118 953 1992-03-06T00:26:57.024Z 1992-03-06T00:38:08.278Z ORB4840 208 118 953 1992-03-07T00:03:45.690Z 1992-03-07T01:02:38.215Z ORB4841 210 118 953 1992-03-08T00:04:47.122Z 1992-03-08T01:02:20.885Z ORB4842 216 118 953 1992-03-09T00:03:54.768Z 1992-03-09T01:02:08.253Z ORB4843 215 118 953 1992-03-10T00:03:38.726Z 1992-03-10T01:01:53.710Z ORB4844 211 118 953 1992-03-11T00:02:45.630Z 1992-03-11T01:01:38.154Z ORB4845 221 118 953 1992-03-12T00:02:12.535Z 1992-03-12T01:01:23.789Z ORB4846 845 118 953 1992-03-12T23:31:50.469Z 1992-03-13T01:01:18.249Z ORB4847 310 118 953 1992-03-13T23:33:05.391Z 1992-03-14T01:01:01.665Z ORB4848 306 118 953 1992-03-14T23:32:14.062Z 1992-03-15T01:00:46.312Z ORB4849 235 118 953 1992-03-15T23:32:36.258Z 1992-03-16T00:35:46.776Z ORB4850 310 118 953 1992-03-16T23:32:22.461Z 1992-03-17T01:00:17.988Z ORB4851 405 118 953 1992-03-17T23:32:07.922Z 1992-03-18T01:29:58.913Z ORB4852 403 118 953 1992-03-18T23:32:12.320Z 1992-03-19T01:29:44.571Z ORB4853 408 118 953 1992-03-19T23:31:01.469Z 1992-03-20T01:29:30.752Z ORB4854 407 118 953 1992-03-20T23:30:10.633Z 1992-03-21T01:29:12.139Z ORB4855 376 118 953 1992-03-21T23:30:34.562Z 1992-03-22T01:18:58.605Z ORB4856 398 118 953 1992-03-22T23:30:58.469Z 1992-03-23T01:26:18.743Z ORB4857 238 118 953 1992-03-23T23:30:46.125Z 1992-03-24T00:33:54.397Z ORB4858 405 118 953 1992-03-24T23:30:33.086Z 1992-03-25T01:28:23.326Z ORB4859 240 118 953 1992-03-25T23:29:45.758Z 1992-03-26T00:33:42.800Z ORB4861 403 118 953 1992-03-27T23:30:17.633Z 1992-03-28T01:27:49.134Z ORB4862 375 118 953 1992-03-28T23:29:49.031Z 1992-03-29T01:17:34.035Z ORB4863 412 118 953 1992-03-29T23:28:21.945Z 1992-03-30T01:27:28.697Z ORB4864 406 118 953 1992-03-30T23:28:13.125Z 1992-03-31T01:27:19.127Z ORB4865 178 118 953 1992-03-31T23:29:52.070Z 1992-04-01T00:32:39.059Z ORB4866 321 118 953 1992-04-01T23:30:07.727Z 1992-04-02T01:26:54.266Z ORB4867 234 118 953 1992-04-02T23:32:30.633Z 1992-04-03T01:26:47.922Z ORB4868 313 118 953 1992-04-03T23:28:12.289Z 1992-04-04T01:26:35.577Z ORB4869 320 118 953 1992-04-04T23:29:45.977Z 1992-04-05T01:26:32.018Z ORB4870 199 118 953 1992-04-05T23:27:56.414Z 1992-04-06T00:31:58.688Z ORB4871 320 118 953 1992-04-06T23:28:41.352Z 1992-04-07T01:26:14.645Z ORB4872 319 118 953 1992-04-07T23:27:59.047Z 1992-04-08T01:26:09.084Z ORB4873 310 118 953 1992-04-08T23:27:39.500Z 1992-04-09T01:26:04.037Z ORB4874 317 118 953 1992-04-09T23:29:54.430Z 1992-04-10T01:26:02.968Z ORB4875 465 118 953 1992-04-10T23:27:09.844Z 1992-04-11T00:31:47.100Z ORB4876 319 118 953 1992-04-11T23:28:17.297Z 1992-04-12T01:26:19.337Z ORB4877 313 118 953 1992-04-12T23:32:49.742Z 1992-04-13T01:26:13.780Z ORB4878 314 118 953 1992-04-13T23:28:14.156Z 1992-04-14T01:25:24.696Z ORB4879 219 118 953 1992-04-14T23:27:49.117Z 1992-04-15T00:43:02.393Z ORB4881 176 118 953 1992-04-16T23:29:21.273Z 1992-04-17T00:31:57.025Z ORB4882 173 118 953 1992-04-17T23:29:10.242Z 1992-04-18T00:31:55.240Z ORB4883 75 118 953 1992-04-19T00:19:58.448Z 1992-04-19T00:31:56.205Z ORB4884 317 118 953 1992-04-19T23:30:16.398Z 1992-04-20T01:26:26.434Z ORB4885 319 118 953 1992-04-20T23:29:56.859Z 1992-04-21T01:26:27.398Z ORB4886 199 118 953 1992-04-21T23:28:03.805Z 1992-04-22T00:32:06.822Z ORB4887 172 118 953 1992-04-22T23:27:43.516Z 1992-04-23T00:27:55.479Z ORB4888 323 118 953 1992-04-23T23:29:43.227Z 1992-04-24T01:26:43.264Z ORB4889 298 118 953 1992-04-24T23:29:23.672Z 1992-04-25T01:26:49.710Z ORB4890 232 118 953 1992-04-25T23:29:38.148Z 1992-04-26T00:48:36.174Z ORB4891 314 118 953 1992-04-26T23:30:22.562Z 1992-04-27T01:26:54.605Z ORB4892 335 118 953 1992-04-28T00:03:31.044Z 1992-04-28T01:27:07.069Z ORB4893 576 118 953 1992-04-28T23:28:21.945Z 1992-04-29T00:28:50.964Z ORB4894 315 118 953 1992-04-29T23:29:39.414Z 1992-04-30T01:26:49.958Z ORB4895 321 118 953 1992-04-30T23:29:22.391Z 1992-05-01T01:27:22.935Z ORB4896 309 118 953 1992-05-01T23:34:01.312Z 1992-05-02T01:27:41.352Z ORB4897 313 118 953 1992-05-02T23:32:33.727Z 1992-05-03T01:27:36.268Z ORB4898 319 118 953 1992-05-03T23:31:26.648Z 1992-05-04T01:27:43.936Z ORB4899 774 118 953 1992-05-04T23:29:12.312Z 1992-05-05T00:50:21.838Z 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.