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 ---------------------------------------------------------------------------- ORB4600 76 118 953 1991-07-11T01:01:20.152Z 1991-07-11T01:13:37.383Z ORB4601 363 118 953 1991-07-12T00:37:19.886Z 1991-07-12T01:35:36.405Z ORB4602 353 118 953 1991-07-13T00:35:55.629Z 1991-07-13T01:20:45.645Z ORB4603 351 118 953 1991-07-14T00:38:30.352Z 1991-07-14T01:35:02.620Z ORB4604 488 118 953 1991-07-15T00:35:20.768Z 1991-07-15T01:34:46.538Z ORB4605 356 118 953 1991-07-16T00:36:19.994Z 1991-07-16T01:34:26.764Z ORB4606 470 118 953 1991-07-17T00:40:58.664Z 1991-07-17T02:04:09.191Z ORB4607 526 118 953 1991-07-18T00:44:15.394Z 1991-07-18T02:03:52.170Z ORB4608 741 118 953 1991-07-19T00:03:59.546Z 1991-07-19T02:03:30.838Z ORB4609 588 118 953 1991-07-20T00:29:54.279Z 1991-07-20T02:03:12.312Z ORB4610 174 118 953 1991-07-21T00:28:31.763Z 1991-07-21T01:12:51.531Z ORB4611 388 118 953 1991-07-22T00:28:36.494Z 1991-07-22T01:32:32.768Z ORB4612 497 118 953 1991-07-23T00:02:32.212Z 1991-07-23T01:32:07.494Z ORB4613 627 118 953 1991-07-24T00:02:17.437Z 1991-07-24T01:31:41.718Z ORB4614 522 118 953 1991-07-25T00:02:02.353Z 1991-07-25T01:31:24.884Z ORB4615 836 118 953 1991-07-26T00:01:28.328Z 1991-07-26T02:01:07.620Z ORB4616 755 118 953 1991-07-27T00:01:06.742Z 1991-07-27T02:00:44.782Z ORB4617 120 118 953 1991-07-28T00:00:57.467Z 1991-07-28T00:13:27.222Z ORB4618 690 118 953 1991-07-29T00:00:22.632Z 1991-07-29T02:00:01.421Z ORB4619 373 118 953 1991-07-30T00:13:39.799Z 1991-07-30T01:35:37.327Z ORB4620 685 118 953 1991-07-30T23:59:45.773Z 1991-07-31T01:59:17.062Z ORB4621 621 118 953 1991-07-31T23:59:17.180Z 1991-08-01T01:28:47.963Z ORB4622 418 118 953 1991-08-01T23:59:07.656Z 1991-08-02T00:58:28.180Z ORB4623 76 118 953 1991-08-03T00:52:37.079Z 1991-08-03T01:04:25.848Z ORB4624 621 118 953 1991-08-03T23:58:23.312Z 1991-08-04T01:37:51.846Z ORB4625 897 118 953 1991-08-04T23:57:55.000Z 1991-08-05T01:57:28.043Z ORB4626 514 118 953 1991-08-06T00:00:04.242Z 1991-08-06T01:27:02.025Z ORB4627 801 118 953 1991-08-06T23:57:11.188Z 1991-08-07T01:56:42.479Z ORB4628 866 118 953 1991-08-07T23:56:56.156Z 1991-08-08T01:56:22.951Z ORB4629 775 118 953 1991-08-08T23:56:35.320Z 1991-08-09T01:56:00.365Z ORB4630 782 118 953 1991-08-09T23:56:01.547Z 1991-08-10T01:55:40.842Z ORB4631 465 118 953 1991-08-11T00:37:23.729Z 1991-08-11T01:55:23.755Z ORB4632 517 118 953 1991-08-12T00:37:07.462Z 1991-08-12T01:54:59.738Z ORB4633 565 118 953 1991-08-12T23:55:00.109Z 1991-08-13T01:24:35.142Z ORB4634 642 118 953 1991-08-13T23:54:46.586Z 1991-08-14T01:39:23.375Z ORB4635 647 118 953 1991-08-14T23:54:46.812Z 1991-08-15T01:34:13.352Z ORB4636 789 118 953 1991-08-15T23:54:24.289Z 1991-08-16T01:54:13.083Z ORB4637 856 118 953 1991-08-16T23:53:59.273Z 1991-08-17T01:53:35.318Z ORB4638 762 118 953 1991-08-17T23:53:42.258Z 1991-08-18T01:53:19.799Z ORB4639 616 118 953 1991-08-18T23:53:25.734Z 1991-08-19T01:20:57.770Z ORB4640 506 118 953 1991-08-19T23:53:10.227Z 1991-08-20T01:10:34.254Z ORB4641 552 118 953 1991-08-20T23:53:07.961Z 1991-08-21T01:21:15.491Z ORB4642 535 118 953 1991-08-21T23:53:23.688Z 1991-08-22T01:22:11.718Z ORB4643 760 118 953 1991-08-22T23:52:26.844Z 1991-08-23T01:52:09.885Z ORB4644 527 118 953 1991-08-23T23:52:19.312Z 1991-08-24T01:01:09.785Z ORB4645 40 118 953 1991-08-25T00:53:51.326Z 1991-08-25T01:02:02.328Z ORB4646 508 118 953 1991-08-25T23:51:53.531Z 1991-08-26T01:00:39.800Z ORB4647 478 118 953 1991-08-26T23:51:35.508Z 1991-08-27T01:00:56.223Z ORB4648 593 118 953 1991-08-27T23:51:36.484Z 1991-08-28T01:13:06.511Z ORB4649 545 118 953 1991-08-28T23:51:25.641Z 1991-08-29T01:20:47.926Z ORB4650 918 118 953 1991-08-29T23:51:15.359Z 1991-08-30T01:50:41.902Z ORB4651 895 118 953 1991-08-30T23:51:05.586Z 1991-08-31T01:50:35.379Z ORB4652 884 118 953 1991-08-31T23:52:45.305Z 1991-09-01T01:50:21.100Z ORB4653 359 118 953 1991-09-01T23:50:41.727Z 1991-09-02T01:00:43.479Z ORB4654 603 118 953 1991-09-02T23:50:27.453Z 1991-09-03T01:20:02.486Z ORB4655 488 118 953 1991-09-03T23:50:26.367Z 1991-09-04T00:53:18.110Z ORB4656 911 118 953 1991-09-04T23:50:41.336Z 1991-09-05T01:50:11.129Z ORB4657 883 118 953 1991-09-05T23:50:36.000Z 1991-09-06T01:50:02.795Z ORB4658 1083 118 953 1991-09-06T23:50:25.422Z 1991-09-07T01:50:00.961Z ORB4659 1107 118 953 1991-09-07T23:50:27.641Z 1991-09-08T01:49:56.937Z ORB4660 981 118 953 1991-09-08T23:50:24.117Z 1991-09-09T01:49:47.162Z ORB4661 6 118 953 1991-09-09T23:50:14.844Z 1991-09-09T23:50:46.344Z ORB4662 976 118 953 1991-09-10T23:50:05.828Z 1991-09-11T01:49:47.617Z ORB4663 1040 118 953 1991-09-11T23:50:17.305Z 1991-09-12T01:40:45.091Z ORB4664 1051 118 953 1991-09-12T23:50:15.781Z 1991-09-13T01:49:45.079Z ORB4665 170 118 953 1991-09-13T23:50:08.266Z 1991-09-14T00:08:05.525Z ORB4666 1112 118 953 1991-09-14T23:50:14.000Z 1991-09-15T01:49:43.294Z ORB4667 76 118 953 1991-09-16T00:49:52.008Z 1991-09-16T00:57:44.511Z ORB4668 806 118 953 1991-09-16T23:50:00.969Z 1991-09-17T01:19:34.753Z ORB4669 1111 118 953 1991-09-17T23:50:07.453Z 1991-09-18T01:49:43.246Z ORB4670 838 118 953 1991-09-18T23:50:07.938Z 1991-09-19T01:19:41.722Z ORB4671 1020 118 953 1991-09-19T23:50:14.922Z 1991-09-20T01:49:44.467Z ORB4672 1046 118 953 1991-09-20T23:50:03.656Z 1991-09-21T01:49:45.452Z ORB4673 959 118 953 1991-09-21T23:50:11.164Z 1991-09-22T01:34:45.949Z ORB4674 845 118 953 1991-09-22T23:50:06.148Z 1991-09-23T01:19:40.179Z ORB4675 716 118 953 1991-09-23T23:51:44.625Z 1991-09-24T01:39:50.417Z ORB4676 584 118 953 1991-09-24T23:50:31.055Z 1991-09-25T01:09:59.832Z ORB4683 647 118 953 1991-10-01T23:50:59.703Z 1991-10-02T01:20:21.985Z ORB4684 749 118 953 1991-10-02T23:50:51.953Z 1991-10-03T01:30:37.237Z ORB4685 56 118 953 1991-10-04T00:50:31.879Z 1991-10-04T00:59:11.643Z ORB4686 716 118 953 1991-10-04T23:50:56.555Z 1991-10-05T01:30:32.588Z ORB4687 627 118 953 1991-10-05T23:50:57.727Z 1991-10-06T01:30:31.013Z ORB4688 76 118 953 1991-10-07T00:46:54.977Z 1991-10-07T00:58:43.681Z ORB4690 620 118 953 1991-10-08T23:51:00.898Z 1991-10-09T01:30:34.183Z ORB4691 621 118 953 1991-10-09T23:52:42.383Z 1991-10-10T01:20:33.666Z ORB4692 525 118 953 1991-10-10T23:51:06.367Z 1991-10-11T01:14:23.900Z ORB4693 51 118 953 1991-10-11T23:50:59.359Z 1991-10-11T23:56:14.359Z ORB4694 760 118 953 1991-10-12T23:50:58.031Z 1991-10-13T01:50:34.828Z ORB4695 78 118 953 1991-10-14T00:45:08.810Z 1991-10-14T00:57:17.053Z ORB4696 815 118 953 1991-10-14T23:50:48.078Z 1991-10-15T01:50:31.127Z ORB4697 548 118 953 1991-10-15T23:50:51.852Z 1991-10-16T01:20:20.641Z ORB4698 794 118 953 1991-10-16T23:50:48.625Z 1991-10-17T01:50:21.674Z ORB4699 750 118 953 1991-10-17T23:50:44.836Z 1991-10-18T01:50:21.385Z 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.