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 ---------------------------------------------------------------------------- ORB4300 1 118 953 1990-09-27T01:24:18.907Z 1990-09-27T01:24:18.907Z ORB4301 1 118 953 1990-09-27T01:24:30.907Z 1990-09-27T01:24:30.907Z ORB4302 1 118 953 1990-09-27T01:24:44.907Z 1990-09-27T01:24:44.907Z ORB4303 1 118 953 1990-09-27T01:24:56.907Z 1990-09-27T01:24:56.907Z ORB4304 1 118 953 1990-09-27T01:25:08.907Z 1990-09-27T01:25:08.907Z ORB4305 1 118 953 1990-09-27T01:25:22.907Z 1990-09-27T01:25:22.907Z ORB4306 1 118 953 1990-09-27T01:25:34.907Z 1990-09-27T01:25:34.907Z ORB4307 1 118 953 1990-09-27T01:25:46.907Z 1990-09-27T01:25:46.907Z ORB4308 1 118 953 1990-09-27T01:25:58.907Z 1990-09-27T01:25:58.907Z ORB4309 1 118 953 1990-09-27T01:26:12.907Z 1990-09-27T01:26:12.907Z ORB4310 1 118 953 1990-09-27T01:26:24.907Z 1990-09-27T01:26:24.907Z ORB4311 1 118 953 1990-09-27T01:26:36.908Z 1990-09-27T01:26:36.908Z ORB4313 538 118 953 1990-09-27T01:26:50.908Z 1990-09-27T03:14:04.943Z ORB4314 393 118 953 1990-09-28T01:14:27.375Z 1990-09-28T03:13:52.665Z ORB4315 516 118 953 1990-09-29T01:16:01.113Z 1990-09-29T03:13:29.651Z ORB4316 290 118 953 1990-09-30T01:14:58.081Z 1990-09-30T03:12:42.121Z ORB4317 445 118 953 1990-10-01T01:14:30.552Z 1990-10-01T03:07:56.091Z ORB4318 574 118 953 1990-10-02T01:15:02.536Z 1990-10-02T03:12:28.576Z ORB4319 293 118 953 1990-10-03T01:13:58.960Z 1990-10-03T03:11:55.000Z ORB4320 587 118 953 1990-10-04T01:12:45.444Z 1990-10-04T03:11:59.482Z ORB4321 257 118 953 1990-10-05T01:13:23.895Z 1990-10-05T03:11:13.186Z ORB4322 435 118 953 1990-10-06T01:13:13.601Z 1990-10-06T03:11:18.891Z ORB4323 76 118 953 1990-10-07T01:58:20.265Z 1990-10-07T02:22:17.276Z ORB4324 36 118 953 1990-10-08T02:09:15.061Z 1990-10-08T02:12:55.562Z ORB4325 452 118 953 1990-10-09T01:37:01.265Z 1990-10-09T03:10:37.292Z ORB4326 252 118 953 1990-10-10T01:26:23.678Z 1990-10-10T03:06:14.962Z ORB4327 426 118 953 1990-10-11T01:32:45.402Z 1990-10-11T03:01:57.429Z ORB4328 43 118 953 1990-10-12T01:29:15.811Z 1990-10-12T01:46:55.817Z ORB4329 392 118 953 1990-10-13T01:27:29.282Z 1990-10-13T03:09:30.564Z ORB4330 249 118 953 1990-10-14T01:17:04.998Z 1990-10-14T03:08:57.534Z ORB4331 419 118 953 1990-10-15T01:13:23.956Z 1990-10-15T03:02:02.743Z ORB4332 502 118 953 1990-10-16T01:11:57.136Z 1990-10-16T03:01:55.171Z ORB4333 168 118 953 1990-10-17T01:10:09.546Z 1990-10-17T03:01:48.082Z ORB4334 187 118 953 1990-10-18T01:17:12.459Z 1990-10-18T03:08:14.494Z ORB4335 1 118 953 1990-11-18T01:02:22.709Z 1990-11-18T01:02:22.709Z ORB4336 1 118 953 1990-11-18T01:02:34.709Z 1990-11-18T01:02:34.709Z ORB4337 1 118 953 1990-11-18T01:03:12.709Z 1990-11-18T01:03:12.709Z ORB4338 1 118 953 1990-11-18T01:03:38.709Z 1990-11-18T01:03:38.709Z ORB4339 1 118 953 1990-11-18T01:03:50.709Z 1990-11-18T01:03:50.709Z ORB4340 1 118 953 1990-11-18T01:04:02.709Z 1990-11-18T01:04:02.709Z ORB4341 1 118 953 1990-11-18T01:04:16.709Z 1990-11-18T01:04:16.709Z ORB4342 1 118 953 1990-11-18T01:04:28.709Z 1990-11-18T01:04:28.709Z ORB4343 1 118 953 1990-11-18T01:04:40.709Z 1990-11-18T01:04:40.709Z ORB4344 1 118 953 1990-11-18T01:04:54.709Z 1990-11-18T01:04:54.709Z ORB4345 1 118 953 1990-11-18T01:05:18.709Z 1990-11-18T01:05:18.709Z ORB4346 1 118 953 1990-11-18T01:08:14.711Z 1990-11-18T01:08:14.711Z ORB4347 1 118 953 1990-11-18T01:08:28.711Z 1990-11-18T01:08:28.711Z ORB4348 1 118 953 1990-11-18T01:08:40.711Z 1990-11-18T01:08:40.711Z ORB4349 1 118 953 1990-11-18T01:09:06.711Z 1990-11-18T01:09:06.711Z ORB4350 1 118 953 1990-11-18T01:09:18.711Z 1990-11-18T01:09:18.711Z ORB4351 1 118 953 1990-11-18T01:09:30.711Z 1990-11-18T01:09:30.711Z ORB4352 1 118 953 1990-11-18T01:09:42.711Z 1990-11-18T01:09:42.711Z ORB4353 1 118 953 1990-11-18T01:09:56.711Z 1990-11-18T01:09:56.711Z ORB4354 1 118 953 1990-11-18T01:10:08.711Z 1990-11-18T01:10:08.711Z ORB4355 1 118 953 1990-11-18T01:10:34.712Z 1990-11-18T01:10:34.712Z ORB4356 1 118 953 1990-11-18T01:10:46.712Z 1990-11-18T01:10:46.712Z ORB4357 1 118 953 1990-11-18T01:10:58.712Z 1990-11-18T01:10:58.712Z ORB4358 1 118 953 1990-11-18T01:11:12.712Z 1990-11-18T01:11:12.712Z ORB4359 1 118 953 1990-11-18T01:11:24.712Z 1990-11-18T01:11:24.712Z ORB4360 1 118 953 1990-11-18T01:11:36.712Z 1990-11-18T01:11:36.712Z ORB4361 1 118 953 1990-11-18T01:11:48.712Z 1990-11-18T01:11:48.712Z ORB4362 1 118 953 1990-11-18T01:12:02.712Z 1990-11-18T01:12:02.712Z ORB4363 1 118 953 1990-11-18T01:12:14.712Z 1990-11-18T01:12:14.712Z ORB4365 133 118 953 1990-11-18T01:12:26.712Z 1990-11-18T02:45:43.493Z ORB4366 227 118 953 1990-11-19T01:23:33.938Z 1990-11-19T03:00:33.217Z ORB4367 23 118 953 1990-11-20T01:47:06.126Z 1990-11-20T02:12:00.919Z ORB4368 218 118 953 1990-11-21T01:02:40.082Z 1990-11-21T02:59:40.868Z ORB4369 1 118 953 1990-11-24T01:02:08.164Z 1990-11-24T01:02:08.164Z ORB4371 272 118 953 1990-11-24T01:02:32.164Z 1990-11-24T02:59:52.701Z ORB4372 454 118 953 1990-11-25T01:02:11.069Z 1990-11-25T03:00:06.108Z ORB4373 73 118 953 1990-11-26T01:47:45.776Z 1990-11-26T01:59:25.493Z ORB4374 558 118 953 1990-11-27T01:00:00.248Z 1990-11-27T02:59:13.785Z ORB4375 139 118 953 1990-11-28T01:57:19.724Z 1990-11-28T02:57:56.491Z ORB4376 564 118 953 1990-11-29T00:59:36.860Z 1990-11-29T02:52:44.895Z ORB4377 316 118 953 1990-11-30T01:37:51.330Z 1990-11-30T02:47:33.350Z ORB4378 588 118 953 1990-12-01T00:59:33.724Z 1990-12-01T03:29:21.771Z ORB4379 1 118 953 1990-12-04T01:50:20.795Z 1990-12-04T01:50:20.795Z ORB4381 74 118 953 1990-12-04T01:50:30.532Z 1990-12-04T02:02:00.513Z ORB4382 369 118 953 1990-12-05T01:32:09.512Z 1990-12-05T02:56:13.537Z ORB4383 257 118 953 1990-12-06T01:49:39.435Z 1990-12-06T02:55:35.229Z ORB4384 421 118 953 1990-12-07T01:07:59.652Z 1990-12-07T02:44:52.181Z ORB4385 532 118 953 1990-12-08T00:56:48.570Z 1990-12-08T02:54:59.856Z ORB4386 364 118 953 1990-12-09T00:55:08.256Z 1990-12-09T02:14:22.280Z ORB4387 376 118 953 1990-12-10T00:56:22.684Z 1990-12-10T02:14:11.458Z ORB4388 1069 118 953 1990-12-11T00:54:23.867Z 1990-12-11T02:53:59.407Z ORB4389 1138 118 953 1990-12-12T00:53:48.835Z 1990-12-12T02:53:17.874Z ORB4391 91 118 953 1990-12-14T01:01:34.267Z 1990-12-14T01:23:00.273Z ORB4392 387 118 953 1990-12-15T00:54:13.974Z 1990-12-15T02:14:31.251Z ORB4393 1087 118 953 1990-12-16T00:51:42.680Z 1990-12-16T02:51:06.722Z ORB4394 567 118 953 1990-12-17T00:52:51.146Z 1990-12-17T02:50:37.683Z ORB4395 1141 118 953 1990-12-18T00:50:45.104Z 1990-12-18T02:50:27.144Z ORB4396 1137 118 953 1990-12-19T00:50:29.071Z 1990-12-19T02:49:58.111Z ORB4397 584 118 953 1990-12-20T01:43:58.557Z 1990-12-20T02:49:29.579Z ORB4398 1095 118 953 1990-12-21T00:49:50.006Z 1990-12-21T02:49:00.547Z ORB4399 493 118 953 1990-12-22T00:52:04.948Z 1990-12-22T02:33:36.230Z 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.