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 ---------------------------------------------------------------------------- ORB0600 570 118 953 1980-07-27T14:53:06.910Z 1980-07-27T15:52:58.043Z ORB0601 569 118 953 1980-07-28T14:55:52.574Z 1980-07-28T15:55:43.562Z ORB0602 571 118 953 1980-07-29T14:58:36.230Z 1980-07-29T15:58:27.332Z ORB0603 571 118 953 1980-07-30T15:01:18.484Z 1980-07-30T16:01:15.832Z ORB0604 554 118 953 1980-07-31T15:04:30.934Z 1980-07-31T16:03:56.715Z ORB0605 554 118 953 1980-08-01T15:06:47.238Z 1980-08-01T16:06:38.270Z ORB0606 567 118 953 1980-08-02T15:09:26.805Z 1980-08-02T16:09:23.973Z ORB0607 570 118 953 1980-08-03T15:12:12.598Z 1980-08-03T16:12:03.621Z ORB0608 571 118 953 1980-08-04T15:14:57.156Z 1980-08-04T16:14:48.250Z ORB0609 571 118 953 1980-08-05T15:17:41.891Z 1980-08-05T16:17:33.008Z ORB0610 572 118 953 1980-08-06T15:20:22.188Z 1980-08-06T16:20:19.672Z ORB0611 560 118 953 1980-08-07T15:23:07.082Z 1980-08-07T16:23:04.602Z ORB0612 568 118 953 1980-08-08T15:25:56.703Z 1980-08-08T16:25:48.125Z ORB0613 571 118 953 1980-08-09T15:28:41.086Z 1980-08-09T16:28:32.113Z ORB0614 567 118 953 1980-08-10T15:31:27.293Z 1980-08-10T16:31:18.266Z ORB0615 570 118 953 1980-08-11T15:34:15.250Z 1980-08-11T16:34:06.129Z ORB0616 566 118 953 1980-08-12T15:37:00.188Z 1980-08-12T16:36:51.098Z ORB0617 570 118 953 1980-08-13T15:39:49.273Z 1980-08-13T16:39:40.059Z ORB0618 566 118 953 1980-08-14T15:42:35.238Z 1980-08-14T16:42:26.316Z ORB0619 567 118 953 1980-08-15T15:45:25.461Z 1980-08-15T16:45:16.477Z ORB0620 566 118 953 1980-08-16T15:48:13.805Z 1980-08-16T16:48:04.750Z ORB0621 569 118 953 1980-08-17T15:50:59.332Z 1980-08-17T16:50:56.629Z ORB0622 566 118 953 1980-08-18T15:53:50.301Z 1980-08-18T16:53:47.625Z ORB0623 543 118 953 1980-08-19T15:56:39.242Z 1980-08-19T16:56:36.449Z ORB0624 572 118 953 1980-08-20T15:59:28.371Z 1980-08-20T16:59:25.699Z ORB0625 543 118 953 1980-08-21T16:02:19.660Z 1980-08-21T17:02:16.887Z ORB0626 545 118 953 1980-08-22T16:05:10.066Z 1980-08-22T17:05:07.270Z ORB0627 571 118 953 1980-08-23T16:08:03.621Z 1980-08-23T17:07:54.945Z ORB0628 487 118 953 1980-08-24T16:10:54.617Z 1980-08-24T17:10:51.121Z ORB0629 569 118 953 1980-08-25T16:13:44.570Z 1980-08-25T17:13:42.004Z ORB0630 571 118 953 1980-08-26T16:16:37.430Z 1980-08-26T17:16:35.316Z ORB0631 571 118 953 1980-08-27T16:19:34.590Z 1980-08-27T17:19:25.738Z ORB0632 544 118 953 1980-08-28T16:22:22.738Z 1980-08-28T17:22:19.859Z ORB0633 572 118 953 1980-08-29T16:25:14.070Z 1980-08-29T17:25:11.441Z ORB0634 571 118 953 1980-08-30T16:28:08.875Z 1980-08-30T17:27:59.719Z ORB0635 503 118 953 1980-08-31T16:31:00.891Z 1980-08-31T17:30:52.703Z ORB0636 552 118 953 1980-09-01T16:33:53.891Z 1980-09-01T17:33:51.266Z ORB0637 564 118 953 1980-09-02T16:36:46.469Z 1980-09-02T17:36:43.875Z ORB0638 571 118 953 1980-09-03T16:39:38.391Z 1980-09-03T17:39:35.719Z ORB0639 559 118 953 1980-09-04T16:42:30.535Z 1980-09-04T17:42:27.922Z ORB0640 564 118 953 1980-09-05T16:45:22.180Z 1980-09-05T17:45:19.406Z ORB0641 572 118 953 1980-09-06T16:48:14.828Z 1980-09-06T17:48:12.254Z ORB0642 502 118 953 1980-09-07T16:51:12.758Z 1980-09-07T17:51:01.582Z ORB0643 571 118 953 1980-09-08T16:54:02.734Z 1980-09-08T17:53:53.621Z ORB0644 572 118 953 1980-09-09T16:56:50.750Z 1980-09-09T17:56:47.855Z ORB0645 570 118 953 1980-09-10T16:59:47.090Z 1980-09-10T17:59:38.281Z ORB0646 564 118 953 1980-09-11T17:02:32.992Z 1980-09-11T18:02:30.363Z ORB0647 569 118 953 1980-09-12T17:05:27.121Z 1980-09-12T18:05:18.160Z ORB0648 562 118 953 1980-09-13T17:08:14.258Z 1980-09-13T18:08:11.273Z ORB0649 489 118 953 1980-09-14T17:11:07.723Z 1980-09-14T18:11:02.801Z ORB0650 571 118 953 1980-09-15T17:13:57.602Z 1980-09-15T18:13:48.789Z ORB0651 570 118 953 1980-09-16T17:16:47.125Z 1980-09-16T18:16:37.859Z ORB0652 572 118 953 1980-09-17T17:19:32.758Z 1980-09-17T18:19:30.023Z ORB0653 564 118 953 1980-09-18T17:22:23.785Z 1980-09-18T18:22:14.586Z ORB0654 572 118 953 1980-09-19T17:25:07.719Z 1980-09-19T18:25:05.016Z ORB0655 480 118 953 1980-09-20T17:27:55.547Z 1980-09-20T18:27:47.727Z ORB0656 348 118 953 1980-09-21T17:30:46.418Z 1980-09-21T18:30:33.805Z ORB0657 410 118 953 1980-09-22T17:33:32.543Z 1980-09-22T18:33:19.477Z ORB0658 405 118 953 1980-09-23T17:36:14.918Z 1980-09-23T18:35:48.852Z ORB0659 401 118 953 1980-09-24T17:39:03.492Z 1980-09-24T18:38:55.273Z ORB0660 358 118 953 1980-09-25T17:41:44.613Z 1980-09-25T18:41:41.352Z ORB0661 297 118 953 1980-09-26T17:44:34.797Z 1980-09-26T18:26:39.977Z ORB0662 378 118 953 1980-09-27T17:47:10.176Z 1980-09-27T18:46:34.203Z ORB0663 345 118 953 1980-09-28T17:49:51.758Z 1980-09-28T18:49:32.836Z ORB0664 397 118 953 1980-09-29T17:52:33.441Z 1980-09-29T18:52:13.969Z ORB0665 405 118 953 1980-09-30T17:55:15.828Z 1980-09-30T18:54:56.359Z ORB0666 409 118 953 1980-10-01T17:57:55.312Z 1980-10-01T18:57:26.242Z ORB0667 344 118 953 1980-10-02T18:00:41.199Z 1980-10-02T19:00:19.633Z ORB0668 372 118 953 1980-10-03T18:03:14.238Z 1980-10-03T19:02:54.516Z ORB0669 369 118 953 1980-10-04T18:06:00.375Z 1980-10-04T19:04:59.156Z ORB0670 296 118 953 1980-10-05T18:08:34.266Z 1980-10-05T19:08:04.039Z ORB0671 344 118 953 1980-10-06T18:11:16.652Z 1980-10-06T19:10:40.680Z ORB0672 203 118 953 1980-10-07T18:13:51.039Z 1980-10-07T18:58:36.312Z ORB0673 353 118 953 1980-10-08T18:16:27.930Z 1980-10-08T19:14:48.203Z ORB0674 324 118 953 1980-10-09T18:19:05.070Z 1980-10-09T19:18:43.344Z ORB0675 370 118 953 1980-10-10T18:21:37.820Z 1980-10-10T19:21:05.992Z ORB0676 311 118 953 1980-10-11T18:24:13.352Z 1980-10-11T19:23:48.883Z ORB0677 294 118 953 1980-10-12T18:26:47.242Z 1980-10-12T19:26:02.273Z ORB0678 351 118 953 1980-10-13T18:29:22.383Z 1980-10-13T19:27:57.906Z ORB0679 361 118 953 1980-10-14T18:31:54.273Z 1980-10-14T19:31:34.305Z ORB0680 335 118 953 1980-10-15T18:34:22.422Z 1980-10-15T19:33:43.953Z ORB0681 359 118 953 1980-10-16T18:36:54.773Z 1980-10-16T19:36:41.344Z ORB0682 358 118 953 1980-10-17T18:39:30.961Z 1980-10-17T19:39:13.242Z ORB0683 321 118 953 1980-10-18T18:41:59.359Z 1980-10-18T19:41:45.891Z ORB0684 262 118 953 1980-10-19T18:44:39.508Z 1980-10-19T19:44:29.539Z ORB0685 326 118 953 1980-10-20T18:47:14.148Z 1980-10-20T19:46:48.180Z ORB0686 285 118 953 1980-10-21T18:49:41.297Z 1980-10-21T19:48:55.812Z ORB0687 391 118 953 1980-10-22T18:52:05.922Z 1980-10-22T19:51:11.406Z ORB0688 282 118 953 1980-10-23T18:54:46.586Z 1980-10-23T19:53:26.070Z ORB0689 283 118 953 1980-10-24T18:57:07.227Z 1980-10-24T19:56:29.727Z ORB0690 287 118 953 1980-10-25T18:59:38.859Z 1980-10-25T19:59:01.836Z ORB0691 232 118 953 1980-10-26T19:02:18.500Z 1980-10-26T20:01:32.508Z ORB0692 290 118 953 1980-10-27T19:04:43.133Z 1980-10-27T20:04:03.117Z ORB0693 287 118 953 1980-10-28T19:07:12.773Z 1980-10-28T20:06:14.242Z ORB0694 254 118 953 1980-10-29T19:09:41.406Z 1980-10-29T20:08:48.422Z ORB0695 271 118 953 1980-10-30T19:12:15.047Z 1980-10-30T20:11:34.023Z ORB0696 281 118 953 1980-10-31T19:14:54.688Z 1980-10-31T20:13:29.656Z ORB0697 285 118 953 1980-11-01T19:17:14.820Z 1980-11-01T20:16:03.836Z ORB0698 224 118 953 1980-11-02T19:20:52.961Z 1980-11-02T20:19:09.992Z ORB0699 144 118 953 1980-11-03T19:22:18.602Z 1980-11-03T20:21:20.617Z 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.