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 ---------------------------------------------------------------------------- ORB4500 1100 118 953 1991-04-02T00:27:01.571Z 1991-04-02T02:25:38.860Z ORB4501 280 118 953 1991-04-03T01:26:29.288Z 1991-04-03T02:24:55.574Z ORB4502 574 118 953 1991-04-04T00:26:00.988Z 1991-04-04T02:24:38.029Z ORB4503 549 118 953 1991-04-05T00:25:37.475Z 1991-04-05T02:24:08.516Z ORB4504 574 118 953 1991-04-06T00:25:00.897Z 1991-04-06T02:23:56.937Z ORB4505 1126 118 953 1991-04-07T00:25:05.318Z 1991-04-07T02:23:38.109Z ORB4506 575 118 953 1991-04-08T00:24:24.810Z 1991-04-08T02:22:55.850Z ORB4507 571 118 953 1991-04-09T00:24:25.266Z 1991-04-09T02:22:43.307Z ORB4508 532 118 953 1991-04-10T00:23:15.720Z 1991-04-10T02:22:30.762Z ORB4509 502 118 953 1991-04-11T00:29:22.179Z 1991-04-11T02:22:00.217Z ORB4510 1132 118 953 1991-04-12T00:22:51.630Z 1991-04-12T02:21:49.674Z ORB4511 526 118 953 1991-04-13T00:22:16.373Z 1991-04-13T02:21:18.413Z ORB4512 748 118 953 1991-04-14T00:21:41.800Z 1991-04-14T02:20:55.343Z ORB4513 439 118 953 1991-04-15T00:21:27.477Z 1991-04-15T01:30:26.001Z ORB4514 758 118 953 1991-04-16T00:20:35.154Z 1991-04-16T02:19:58.445Z ORB4515 735 118 953 1991-04-17T00:20:40.081Z 1991-04-17T02:19:44.622Z ORB4516 708 118 953 1991-04-18T00:20:06.510Z 1991-04-18T02:19:20.050Z ORB4517 758 118 953 1991-04-19T00:19:34.437Z 1991-04-19T02:18:47.979Z ORB4518 757 118 953 1991-04-20T00:19:21.176Z 1991-04-20T02:18:34.717Z ORB4519 758 118 953 1991-04-21T00:18:40.105Z 1991-04-21T02:17:52.896Z ORB4520 758 118 953 1991-04-22T00:18:26.094Z 1991-04-22T02:17:39.635Z ORB4521 758 118 953 1991-04-23T00:18:13.772Z 1991-04-23T02:17:27.313Z ORB4522 756 118 953 1991-04-24T00:18:10.698Z 1991-04-24T02:17:05.489Z ORB4523 616 118 953 1991-04-25T00:17:40.625Z 1991-04-25T01:57:41.411Z ORB4524 746 118 953 1991-04-26T00:17:00.803Z 1991-04-26T02:16:24.094Z ORB4525 748 118 953 1991-04-27T00:16:42.229Z 1991-04-27T02:16:04.771Z ORB4526 817 118 953 1991-04-28T00:16:41.403Z 1991-04-28T02:11:58.693Z ORB4527 757 118 953 1991-04-29T00:16:12.332Z 1991-04-29T02:15:25.873Z ORB4528 961 118 953 1991-04-30T00:16:39.318Z 1991-04-30T02:00:11.106Z ORB4529 574 118 953 1991-05-01T00:15:43.495Z 1991-05-01T01:17:40.516Z ORB4530 66 118 953 1991-05-02T00:15:25.549Z 1991-05-02T00:22:15.051Z ORB4532 587 118 953 1991-05-04T00:43:38.542Z 1991-05-04T01:45:16.563Z ORB4533 501 118 953 1991-05-05T00:45:23.900Z 1991-05-05T01:38:25.419Z ORB4534 545 118 953 1991-05-06T00:44:27.632Z 1991-05-06T01:43:28.278Z ORB4535 550 118 953 1991-05-07T00:44:19.367Z 1991-05-07T01:43:13.638Z ORB4536 568 118 953 1991-05-08T00:43:27.349Z 1991-05-08T01:42:59.496Z ORB4537 413 118 953 1991-05-09T00:58:54.212Z 1991-05-09T01:42:47.602Z ORB4538 561 118 953 1991-05-10T00:43:44.565Z 1991-05-10T01:42:32.586Z ORB4539 559 118 953 1991-05-11T00:43:07.548Z 1991-05-11T01:42:20.567Z ORB4540 392 118 953 1991-05-12T00:43:59.150Z 1991-05-12T01:26:05.415Z ORB4541 561 118 953 1991-05-13T00:42:45.755Z 1991-05-13T01:41:59.025Z ORB4542 539 118 953 1991-05-14T00:42:47.483Z 1991-05-14T01:39:42.128Z ORB4543 357 118 953 1991-05-15T00:42:55.054Z 1991-05-15T01:20:43.067Z ORB4544 367 118 953 1991-05-16T00:42:23.159Z 1991-05-16T01:41:32.681Z ORB4545 459 118 953 1991-05-17T00:42:19.109Z 1991-05-17T01:41:19.755Z ORB4546 13 118 953 1991-05-18T00:41:59.216Z 1991-05-18T00:43:14.841Z ORB4547 562 118 953 1991-05-19T00:42:03.447Z 1991-05-19T01:41:03.968Z ORB4548 553 118 953 1991-05-20T00:42:47.556Z 1991-05-20T01:40:57.702Z ORB4549 561 118 953 1991-05-21T00:41:45.910Z 1991-05-21T01:40:52.807Z ORB4550 231 118 953 1991-05-22T00:41:25.641Z 1991-05-22T01:22:59.542Z ORB4551 522 118 953 1991-05-23T00:45:44.314Z 1991-05-23T01:40:39.208Z ORB4552 559 118 953 1991-05-24T00:41:15.297Z 1991-05-24T01:40:28.317Z ORB4553 566 118 953 1991-05-25T00:41:11.025Z 1991-05-25T01:40:30.546Z ORB4554 527 118 953 1991-05-26T00:41:19.384Z 1991-05-26T01:36:33.154Z ORB4555 559 118 953 1991-05-27T00:41:53.997Z 1991-05-27T01:40:29.394Z ORB4556 341 118 953 1991-05-28T00:41:26.730Z 1991-05-28T01:17:08.743Z ORB4557 564 118 953 1991-05-29T00:41:16.589Z 1991-05-29T01:40:23.484Z ORB4561 564 118 953 1991-06-02T00:41:11.020Z 1991-06-02T01:40:17.916Z ORB4562 556 118 953 1991-06-03T00:41:19.010Z 1991-06-03T01:40:13.280Z ORB4563 563 118 953 1991-06-04T00:41:10.621Z 1991-06-04T01:40:11.269Z ORB4564 564 118 953 1991-06-05T00:41:02.582Z 1991-06-05T01:40:09.479Z ORB4565 208 118 953 1991-06-06T00:41:13.544Z 1991-06-06T01:02:57.677Z ORB4566 381 118 953 1991-06-07T01:00:13.156Z 1991-06-07T01:40:07.171Z ORB4567 564 118 953 1991-06-08T00:40:32.391Z 1991-06-08T01:40:04.413Z ORB4568 567 118 953 1991-06-09T00:40:36.879Z 1991-06-09T01:40:02.650Z ORB4569 562 118 953 1991-06-10T00:40:53.992Z 1991-06-10T01:40:00.888Z ORB4570 558 118 953 1991-06-11T00:41:30.598Z 1991-06-11T01:39:59.744Z ORB4571 568 118 953 1991-06-12T00:40:24.589Z 1991-06-12T01:39:56.609Z ORB4572 562 118 953 1991-06-13T00:40:41.075Z 1991-06-13T01:39:54.221Z ORB4573 565 118 953 1991-06-14T00:40:39.808Z 1991-06-14T01:39:53.080Z ORB4574 568 118 953 1991-06-15T00:40:16.923Z 1991-06-15T01:39:48.944Z ORB4575 386 118 953 1991-06-16T00:40:45.411Z 1991-06-16T01:21:10.925Z ORB4576 563 118 953 1991-06-17T00:40:41.772Z 1991-06-17T01:39:42.293Z ORB4577 475 118 953 1991-06-18T00:40:31.637Z 1991-06-18T01:34:42.405Z ORB4578 512 118 953 1991-06-19T00:40:20.996Z 1991-06-19T01:34:38.016Z ORB4579 564 118 953 1991-06-20T00:40:19.607Z 1991-06-20T01:39:32.878Z ORB4580 526 118 953 1991-06-21T00:39:58.365Z 1991-06-21T01:39:24.135Z ORB4581 561 118 953 1991-06-22T00:40:35.470Z 1991-06-22T01:39:23.492Z ORB4582 566 118 953 1991-06-23T00:39:33.960Z 1991-06-23T01:39:12.230Z ORB4583 539 118 953 1991-06-24T00:39:58.949Z 1991-06-24T01:39:05.720Z ORB4584 564 118 953 1991-06-25T00:39:51.934Z 1991-06-25T01:38:58.830Z ORB4585 561 118 953 1991-06-26T00:40:04.426Z 1991-06-26T01:38:52.446Z ORB4586 516 118 953 1991-06-27T00:40:08.287Z 1991-06-27T01:38:43.807Z ORB4587 462 118 953 1991-06-28T00:39:28.423Z 1991-06-28T01:27:52.815Z ORB4588 567 118 953 1991-06-29T00:39:00.163Z 1991-06-29T01:38:26.183Z ORB4589 154 118 953 1991-06-30T00:54:41.140Z 1991-06-30T01:18:47.140Z ORB4590 559 118 953 1991-07-01T00:39:30.069Z 1991-07-01T01:38:05.589Z ORB4591 433 118 953 1991-07-02T00:38:48.306Z 1991-07-02T01:37:54.826Z ORB4592 473 118 953 1991-07-03T00:38:12.531Z 1991-07-03T01:38:09.802Z ORB4594 520 118 953 1991-07-05T00:38:42.747Z 1991-07-05T01:37:18.266Z ORB4595 464 118 953 1991-07-06T00:37:40.726Z 1991-07-06T01:37:19.246Z ORB4596 351 118 953 1991-07-07T00:38:14.451Z 1991-07-07T01:36:49.722Z ORB4597 371 118 953 1991-07-08T00:38:18.611Z 1991-07-08T01:36:35.131Z ORB4598 371 118 953 1991-07-09T00:37:44.772Z 1991-07-09T01:36:20.042Z ORB4599 479 118 953 1991-07-10T00:36:29.183Z 1991-07-10T01:36:07.453Z 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.