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 ---------------------------------------------------------------------------- ORB0300 204 118 953 1979-09-30T00:37:59.785Z 1979-09-30T01:34:12.809Z ORB0301 209 118 953 1979-10-02T00:43:57.428Z 1979-10-02T01:42:39.953Z ORB0302 217 118 953 1979-10-03T00:52:00.571Z 1979-10-03T01:51:36.097Z ORB0303 136 118 953 1979-10-04T00:59:50.716Z 1979-10-04T01:59:26.743Z ORB0304 473 118 953 1979-10-05T01:06:35.163Z 1979-10-05T02:06:25.390Z ORB0305 277 118 953 1979-10-06T01:16:55.522Z 1979-10-06T02:13:19.346Z ORB0306 439 118 953 1979-10-07T01:20:18.575Z 1979-10-07T02:20:11.202Z ORB0307 434 118 953 1979-10-08T01:27:14.630Z 1979-10-08T02:27:01.356Z ORB0308 456 118 953 1979-10-09T01:34:01.483Z 1979-10-09T02:32:57.009Z ORB0309 220 118 953 1979-10-10T01:41:03.140Z 1979-10-10T02:39:55.165Z ORB0310 207 118 953 1979-10-11T01:47:46.790Z 1979-10-11T02:46:38.815Z ORB0311 219 118 953 1979-10-12T01:54:00.435Z 1979-10-12T02:53:58.964Z ORB0312 466 118 953 1979-10-13T02:00:23.385Z 1979-10-13T03:00:16.113Z ORB0313 477 118 953 1979-10-14T02:06:47.635Z 1979-10-14T03:06:38.261Z ORB0314 445 118 953 1979-10-15T02:13:06.282Z 1979-10-15T03:13:04.910Z ORB0315 480 118 953 1979-10-16T02:19:24.828Z 1979-10-16T03:19:11.557Z ORB0316 131 118 953 1979-10-17T02:35:28.678Z 1979-10-17T03:17:34.696Z ORB0318 425 118 953 1979-10-19T02:38:17.661Z 1979-10-19T03:37:25.240Z ORB0319 430 118 953 1979-10-20T02:44:33.509Z 1979-10-20T03:44:17.139Z ORB0320 474 118 953 1979-10-21T02:50:45.546Z 1979-10-21T03:50:37.026Z ORB0321 474 118 953 1979-10-22T02:56:56.344Z 1979-10-22T03:56:42.421Z ORB0322 470 118 953 1979-10-23T03:03:05.980Z 1979-10-23T04:02:52.062Z ORB0323 219 118 953 1979-10-24T03:09:32.170Z 1979-10-24T04:08:15.694Z ORB0324 197 118 953 1979-10-25T03:15:46.293Z 1979-10-25T04:14:54.818Z ORB0325 420 118 953 1979-10-26T03:21:32.975Z 1979-10-26T04:20:54.451Z ORB0326 62 118 953 1979-10-27T03:27:51.060Z 1979-10-27T04:27:31.085Z ORB0327 123 118 953 1979-10-28T03:34:01.682Z 1979-10-28T04:25:32.705Z ORB0328 475 118 953 1979-10-29T03:39:53.356Z 1979-10-29T04:39:43.836Z ORB0329 344 118 953 1979-10-30T03:46:13.943Z 1979-10-30T04:45:52.467Z ORB0330 206 118 953 1979-10-31T03:52:21.066Z 1979-10-31T04:51:48.299Z ORB0331 455 118 953 1979-11-01T03:58:09.246Z 1979-11-01T04:57:57.227Z ORB0332 339 118 953 1979-11-02T04:04:25.087Z 1979-11-02T05:04:00.611Z ORB0333 434 118 953 1979-11-03T04:10:14.721Z 1979-11-03T05:10:00.750Z ORB0334 491 118 953 1979-11-04T04:16:15.110Z 1979-11-04T05:15:59.639Z ORB0335 438 118 953 1979-11-05T04:22:08.053Z 1979-11-05T05:21:51.279Z ORB0336 324 118 953 1979-11-06T04:28:09.641Z 1979-11-06T05:20:52.418Z ORB0337 493 118 953 1979-11-07T04:34:05.139Z 1979-11-07T05:33:52.559Z ORB0338 487 118 953 1979-11-08T04:40:01.131Z 1979-11-08T05:39:47.201Z ORB0339 500 118 953 1979-11-09T04:45:52.475Z 1979-11-09T05:45:40.092Z ORB0340 436 118 953 1979-11-10T04:51:45.016Z 1979-11-10T05:51:33.986Z ORB0341 488 118 953 1979-11-11T04:57:34.949Z 1979-11-11T05:57:23.625Z ORB0342 198 118 953 1979-11-12T05:03:21.299Z 1979-11-12T05:24:25.502Z ORB0343 441 118 953 1979-11-13T05:09:04.951Z 1979-11-13T06:09:01.668Z ORB0344 500 118 953 1979-11-14T05:14:47.133Z 1979-11-14T06:14:38.055Z ORB0345 191 118 953 1979-11-15T05:20:30.023Z 1979-11-15T05:40:26.920Z ORB0346 142 118 953 1979-11-16T05:26:21.018Z 1979-11-16T06:26:01.047Z ORB0347 486 118 953 1979-11-17T05:31:38.449Z 1979-11-17T06:31:26.922Z ORB0348 503 118 953 1979-11-18T05:37:06.854Z 1979-11-18T06:37:03.557Z ORB0349 276 118 953 1979-11-19T05:42:49.373Z 1979-11-19T06:41:47.408Z ORB0350 496 118 953 1979-11-20T05:47:53.746Z 1979-11-20T06:47:43.566Z ORB0351 536 118 953 1979-11-21T05:53:12.830Z 1979-11-21T06:53:10.221Z ORB0352 533 118 953 1979-11-22T05:58:27.475Z 1979-11-22T06:58:23.650Z ORB0353 532 118 953 1979-11-23T06:03:33.818Z 1979-11-23T07:03:25.869Z ORB0354 535 118 953 1979-11-24T06:08:35.539Z 1979-11-24T07:08:25.518Z ORB0355 490 118 953 1979-11-25T06:13:31.652Z 1979-11-25T07:13:10.949Z ORB0359 557 118 953 1979-11-29T06:31:23.779Z 1979-11-29T07:31:14.895Z ORB0360 541 118 953 1979-11-30T06:35:24.918Z 1979-11-30T07:35:16.312Z ORB0361 553 118 953 1979-12-01T06:39:15.355Z 1979-12-01T07:39:03.971Z ORB0362 459 118 953 1979-12-02T06:42:50.613Z 1979-12-02T07:42:39.631Z ORB0363 543 118 953 1979-12-03T06:46:14.869Z 1979-12-03T07:46:02.783Z ORB0364 482 118 953 1979-12-04T06:49:26.230Z 1979-12-04T07:49:19.432Z ORB0365 556 118 953 1979-12-05T06:52:35.146Z 1979-12-05T07:52:18.361Z ORB0366 558 118 953 1979-12-06T06:55:28.729Z 1979-12-06T07:55:13.594Z ORB0367 558 118 953 1979-12-07T06:58:11.197Z 1979-12-07T07:58:02.326Z ORB0368 415 118 953 1979-12-08T07:00:50.600Z 1979-12-08T08:00:41.555Z ORB0369 558 118 953 1979-12-09T07:03:24.254Z 1979-12-09T08:03:15.285Z ORB0370 572 118 953 1979-12-10T07:05:54.555Z 1979-12-10T08:05:52.059Z ORB0371 570 118 953 1979-12-11T07:08:20.709Z 1979-12-11T08:08:05.488Z ORB0372 572 118 953 1979-12-12T07:10:36.980Z 1979-12-12T08:10:34.312Z ORB0373 526 118 953 1979-12-13T07:12:02.307Z 1979-12-13T08:08:44.422Z ORB0374 551 118 953 1979-12-14T07:13:12.346Z 1979-12-14T08:12:00.375Z ORB0375 546 118 953 1979-12-15T07:14:04.799Z 1979-12-15T08:11:18.324Z ORB0376 560 118 953 1979-12-16T07:14:50.855Z 1979-12-16T08:14:48.135Z ORB0377 530 118 953 1979-12-17T07:15:35.018Z 1979-12-17T08:11:07.715Z ORB0378 559 118 953 1979-12-18T07:16:09.844Z 1979-12-18T08:16:07.016Z ORB0379 556 118 953 1979-12-19T07:16:38.129Z 1979-12-19T08:16:35.578Z ORB0380 219 118 953 1979-12-20T07:16:18.740Z 1979-12-20T08:16:02.736Z ORB0381 558 118 953 1979-12-21T07:15:42.395Z 1979-12-21T08:14:23.971Z ORB0382 565 118 953 1979-12-22T07:14:58.029Z 1979-12-22T08:14:49.152Z ORB0383 566 118 953 1979-12-23T07:14:12.273Z 1979-12-23T08:13:31.588Z ORB0384 507 118 953 1979-12-24T07:13:18.186Z 1979-12-24T08:06:26.020Z ORB0385 545 118 953 1979-12-25T07:12:22.402Z 1979-12-25T08:12:13.373Z ORB0386 407 118 953 1979-12-26T07:11:26.258Z 1979-12-26T08:03:18.381Z ORB0387 512 118 953 1979-12-27T07:10:24.449Z 1979-12-27T08:04:54.312Z ORB0388 530 118 953 1979-12-28T07:09:10.201Z 1979-12-28T08:04:42.762Z ORB0389 538 118 953 1979-12-29T07:06:44.871Z 1979-12-29T08:03:39.248Z ORB0390 565 118 953 1979-12-30T07:04:04.756Z 1979-12-30T08:03:47.232Z ORB0391 571 118 953 1979-12-31T07:01:13.381Z 1979-12-31T08:01:04.451Z ORB0392 567 118 953 1980-01-01T06:58:18.012Z 1980-01-01T07:58:08.992Z ORB0393 449 118 953 1980-01-02T06:55:19.477Z 1980-01-02T07:42:21.906Z ORB0394 483 118 953 1980-01-03T06:52:18.865Z 1980-01-03T07:43:39.385Z ORB0395 572 118 953 1980-01-04T06:49:01.447Z 1980-01-04T07:48:58.824Z ORB0396 571 118 953 1980-01-05T06:44:35.338Z 1980-01-05T07:44:26.316Z ORB0397 565 118 953 1980-01-06T06:39:52.102Z 1980-01-06T07:39:05.332Z ORB0398 572 118 953 1980-01-07T06:35:05.242Z 1980-01-07T07:35:02.615Z ORB0399 552 118 953 1980-01-08T06:30:12.885Z 1980-01-08T07:28:48.666Z 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.