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 ---------------------------------------------------------------------------- ORB4700 1717 118 953 1991-10-18T23:50:39.109Z 1991-10-19T01:50:18.661Z ORB4701 750 118 953 1991-10-19T23:50:41.328Z 1991-10-20T01:50:12.625Z ORB4702 76 118 953 1991-10-21T00:43:35.337Z 1991-10-21T00:55:24.107Z ORB4703 404 118 953 1991-10-21T23:50:31.328Z 1991-10-22T01:07:21.029Z ORB4704 691 118 953 1991-10-22T23:50:19.359Z 1991-10-23T01:49:59.907Z ORB4705 470 118 953 1991-10-23T23:50:12.828Z 1991-10-24T00:54:07.297Z ORB4706 5 118 953 1991-10-24T23:50:18.852Z 1991-10-24T23:50:44.102Z ORB4707 796 118 953 1991-10-25T23:50:11.320Z 1991-10-26T01:49:38.114Z ORB4708 637 118 953 1991-10-26T23:49:56.781Z 1991-10-27T01:49:28.076Z ORB4709 75 118 953 1991-10-28T00:41:14.792Z 1991-10-28T00:53:03.497Z ORB4710 669 118 953 1991-10-28T23:49:38.062Z 1991-10-29T01:49:09.355Z ORB4711 75 118 953 1991-10-30T00:41:23.800Z 1991-10-30T01:04:41.736Z ORB4712 591 118 953 1991-10-30T23:49:23.555Z 1991-10-31T01:18:45.839Z ORB4713 746 118 953 1991-10-31T23:49:06.289Z 1991-11-01T01:48:38.584Z ORB4714 476 118 953 1991-11-01T23:49:00.500Z 1991-11-02T00:50:39.475Z ORB4715 695 118 953 1991-11-02T23:48:46.273Z 1991-11-03T01:48:12.318Z ORB4716 797 118 953 1991-11-03T23:48:33.227Z 1991-11-04T01:48:02.027Z ORB4717 454 118 953 1991-11-04T23:48:13.500Z 1991-11-05T01:17:21.264Z ORB4718 419 118 953 1991-11-05T23:48:05.703Z 1991-11-06T01:01:41.482Z ORB4719 593 118 953 1991-11-06T23:47:38.414Z 1991-11-07T01:17:13.453Z ORB4721 777 118 953 1991-11-08T23:47:14.156Z 1991-11-09T01:46:50.205Z ORB4722 646 118 953 1991-11-09T23:47:04.930Z 1991-11-10T01:46:35.229Z ORB4723 759 118 953 1991-11-10T23:46:48.641Z 1991-11-11T01:46:15.439Z ORB4724 411 118 953 1991-11-11T23:46:19.352Z 1991-11-12T00:59:09.332Z ORB4725 408 118 953 1991-11-12T23:46:21.344Z 1991-11-13T00:58:53.798Z ORB4726 747 118 953 1991-11-13T23:45:44.852Z 1991-11-14T01:45:24.398Z ORB4727 646 118 953 1991-11-14T23:45:46.320Z 1991-11-15T01:37:08.861Z ORB4728 786 118 953 1991-11-15T23:45:15.820Z 1991-11-16T01:37:49.365Z ORB4729 77 118 953 1991-11-17T00:33:26.820Z 1991-11-17T00:57:22.334Z ORB4730 468 118 953 1991-11-17T23:44:39.828Z 1991-11-18T00:44:13.077Z ORB4731 73 118 953 1991-11-18T23:44:34.078Z 1991-11-18T23:52:07.578Z ORB4732 404 118 953 1991-11-19T23:44:28.070Z 1991-11-20T00:55:50.032Z ORB4733 745 118 953 1991-11-20T23:44:03.570Z 1991-11-21T01:31:57.108Z ORB4734 678 118 953 1991-11-21T23:43:45.016Z 1991-11-22T01:43:00.556Z ORB4735 747 118 953 1991-11-22T23:43:26.461Z 1991-11-23T01:42:40.500Z ORB4736 643 118 953 1991-11-23T23:43:01.398Z 1991-11-24T01:42:25.445Z ORB4737 813 118 953 1991-11-24T23:42:36.875Z 1991-11-25T01:42:03.422Z ORB4738 402 118 953 1991-11-25T23:42:30.852Z 1991-11-26T00:53:21.337Z ORB4739 405 118 953 1991-11-26T23:41:53.836Z 1991-11-27T00:52:25.791Z ORB4740 460 118 953 1991-11-27T23:41:54.328Z 1991-11-28T00:40:55.336Z ORB4741 696 118 953 1991-11-28T23:41:42.828Z 1991-11-29T01:40:48.870Z ORB4742 578 118 953 1991-11-29T23:41:00.305Z 1991-11-30T01:10:24.336Z ORB4743 460 118 953 1991-11-30T23:40:55.273Z 1991-12-01T01:09:50.262Z ORB4744 818 118 953 1991-12-01T23:40:44.750Z 1991-12-02T01:39:58.792Z ORB4745 688 118 953 1991-12-02T23:40:15.227Z 1991-12-03T01:39:40.269Z ORB4746 700 118 953 1991-12-03T23:39:58.953Z 1991-12-04T01:39:23.993Z ORB4747 519 118 953 1991-12-04T23:39:42.891Z 1991-12-05T01:05:09.172Z ORB4748 705 118 953 1991-12-05T23:39:21.336Z 1991-12-06T01:35:54.875Z ORB4749 669 118 953 1991-12-06T23:39:31.773Z 1991-12-07T01:20:42.311Z ORB4750 72 118 953 1991-12-08T00:26:16.375Z 1991-12-08T00:48:58.230Z ORB4751 797 118 953 1991-12-08T23:38:43.750Z 1991-12-09T01:38:10.792Z ORB4752 430 118 953 1991-12-09T23:38:36.711Z 1991-12-10T00:23:39.232Z ORB4753 75 118 953 1991-12-11T00:25:06.082Z 1991-12-11T00:48:24.017Z ORB4754 277 118 953 1991-12-12T00:08:40.569Z 1991-12-12T01:07:44.339Z ORB4755 75 118 953 1991-12-13T00:24:20.753Z 1991-12-13T00:47:40.187Z ORB4756 134 118 953 1991-12-14T00:07:41.556Z 1991-12-14T00:39:09.312Z ORB4757 13 118 953 1991-12-15T00:10:24.763Z 1991-12-15T00:14:11.241Z ORB4758 284 118 953 1991-12-16T00:07:29.220Z 1991-12-16T01:06:42.739Z ORB4759 38 118 953 1991-12-17T00:34:46.947Z 1991-12-17T00:38:40.198Z ORB4762 76 118 953 1991-12-20T00:22:53.254Z 1991-12-20T00:46:30.792Z ORB4763 97 118 953 1991-12-21T00:06:27.713Z 1991-12-21T00:21:35.218Z ORB4765 305 118 953 1991-12-23T00:06:50.409Z 1991-12-23T01:05:54.178Z ORB4766 43 118 953 1991-12-24T00:06:27.582Z 1991-12-24T00:13:04.334Z ORB4767 59 118 953 1991-12-25T00:22:51.713Z 1991-12-25T00:46:09.777Z ORB4768 122 118 953 1991-12-26T00:06:29.762Z 1991-12-26T00:35:09.515Z ORB4769 93 118 953 1991-12-27T00:08:33.969Z 1991-12-27T00:45:24.957Z ORB4770 36 118 953 1991-12-28T00:33:57.943Z 1991-12-28T00:37:38.444Z ORB4771 73 118 953 1991-12-29T00:07:52.386Z 1991-12-29T00:44:43.381Z ORB4772 161 118 953 1991-12-30T00:06:22.129Z 1991-12-30T00:35:30.348Z ORB4773 268 118 953 1991-12-31T00:06:21.103Z 1991-12-31T01:05:29.623Z ORB4774 66 118 953 1992-01-01T00:22:58.554Z 1992-01-01T00:44:24.011Z ORB4775 313 118 953 1992-01-02T00:06:50.803Z 1992-01-02T01:05:35.822Z ORB4776 176 118 953 1992-01-03T00:08:27.709Z 1992-01-03T01:04:14.237Z ORB4777 395 118 953 1992-01-04T00:06:36.173Z 1992-01-04T01:05:36.943Z ORB4778 180 118 953 1992-01-05T00:07:15.869Z 1992-01-05T01:04:15.848Z ORB4779 299 118 953 1992-01-06T00:06:44.603Z 1992-01-06T01:04:32.622Z ORB4780 408 118 953 1992-01-07T00:06:03.576Z 1992-01-07T01:05:42.096Z ORB4781 104 118 953 1992-01-08T00:13:21.484Z 1992-01-08T00:47:03.460Z ORB4782 75 118 953 1992-01-09T00:07:08.963Z 1992-01-09T00:35:06.694Z ORB4783 110 118 953 1992-01-10T00:07:27.922Z 1992-01-10T00:47:09.939Z ORB4784 158 118 953 1992-01-11T00:06:28.162Z 1992-01-11T00:37:58.162Z ORB4785 167 118 953 1992-01-12T00:08:31.123Z 1992-01-12T01:05:31.101Z ORB4786 153 118 953 1992-01-12T23:15:52.047Z 1992-01-13T00:23:07.595Z ORB4787 113 118 953 1992-01-14T00:07:26.046Z 1992-01-14T00:38:03.807Z ORB4788 181 118 953 1992-01-15T00:08:04.235Z 1992-01-15T01:05:43.251Z ORB4789 149 118 953 1992-01-16T00:06:43.162Z 1992-01-16T00:36:08.366Z ORB4790 566 118 953 1992-01-17T00:06:36.620Z 1992-01-17T01:06:15.639Z ORB4791 148 118 953 1992-01-18T00:07:41.028Z 1992-01-18T00:49:08.542Z ORB4792 182 118 953 1992-01-19T00:07:44.988Z 1992-01-19T00:49:20.002Z ORB4793 156 118 953 1992-01-20T00:07:42.450Z 1992-01-20T00:37:46.188Z ORB4794 127 118 953 1992-01-21T00:07:46.911Z 1992-01-21T00:38:36.926Z ORB4795 168 118 953 1992-01-22T00:07:51.124Z 1992-01-22T00:43:07.147Z ORB4796 165 118 953 1992-01-23T00:07:54.589Z 1992-01-23T00:39:27.799Z ORB4797 167 118 953 1992-01-24T00:07:59.302Z 1992-01-24T00:43:41.318Z ORB4798 242 118 953 1992-01-25T00:07:50.757Z 1992-01-25T01:06:46.026Z ORB4799 167 118 953 1992-01-26T00:08:06.461Z 1992-01-26T00:43:48.476Z 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.