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 ---------------------------------------------------------------------------- ORB2700 365 118 953 1986-04-27T22:55:29.969Z 1986-04-27T23:55:20.859Z ORB2701 214 118 953 1986-04-28T22:55:40.406Z 1986-04-28T23:55:08.922Z ORB2702 364 118 953 1986-04-29T22:55:20.695Z 1986-04-29T23:55:12.172Z ORB2703 221 118 953 1986-04-30T22:55:27.211Z 1986-04-30T23:54:57.977Z ORB2704 74 118 953 1986-05-01T23:18:23.000Z 1986-05-01T23:29:52.516Z ORB2705 362 118 953 1986-05-02T22:55:04.320Z 1986-05-02T23:54:55.031Z ORB2707 360 118 953 1986-05-04T22:54:52.312Z 1986-05-04T23:54:43.023Z ORB2708 220 118 953 1986-05-05T22:54:50.148Z 1986-05-05T23:54:33.656Z ORB2709 373 118 953 1986-05-06T22:54:48.531Z 1986-05-06T23:54:40.406Z ORB2710 222 118 953 1986-05-07T22:54:48.430Z 1986-05-07T23:54:35.688Z ORB2711 71 118 953 1986-05-08T23:17:30.719Z 1986-05-08T23:29:10.430Z ORB2712 362 118 953 1986-05-09T22:54:35.633Z 1986-05-09T23:54:18.094Z ORB2713 212 118 953 1986-05-10T22:54:36.234Z 1986-05-10T23:54:05.500Z ORB2714 351 118 953 1986-05-11T22:54:15.469Z 1986-05-11T23:54:06.250Z ORB2715 29 118 953 1986-05-12T23:16:55.070Z 1986-05-12T23:28:53.570Z ORB2722 215 118 953 1986-05-19T22:53:47.445Z 1986-05-19T23:53:15.961Z ORB2724 215 118 953 1986-05-21T22:53:41.008Z 1986-05-21T23:53:09.523Z ORB2725 71 118 953 1986-05-22T23:16:56.273Z 1986-05-22T23:28:07.523Z ORB2726 360 118 953 1986-05-23T22:53:20.625Z 1986-05-23T23:53:11.531Z ORB2727 223 118 953 1986-05-24T22:53:32.547Z 1986-05-24T23:53:01.062Z ORB2728 372 118 953 1986-05-25T22:53:15.445Z 1986-05-25T23:53:07.320Z ORB2729 72 118 953 1986-05-26T23:16:30.141Z 1986-05-26T23:27:50.656Z ORB2730 336 118 953 1986-05-27T22:53:13.164Z 1986-05-27T23:53:04.164Z ORB2731 156 118 953 1986-05-28T22:53:27.734Z 1986-05-28T23:52:56.250Z ORB2732 70 118 953 1986-05-29T23:16:45.695Z 1986-05-29T23:27:46.859Z ORB2733 357 118 953 1986-05-30T22:53:13.062Z 1986-05-30T23:53:04.250Z ORB2734 212 118 953 1986-05-31T22:53:30.297Z 1986-05-31T23:52:59.562Z ORB2735 366 118 953 1986-06-01T22:53:18.508Z 1986-06-01T23:53:10.258Z ORB2736 215 118 953 1986-06-02T22:53:34.344Z 1986-06-02T23:53:03.609Z ORB2737 365 118 953 1986-06-03T22:53:21.625Z 1986-06-03T23:53:12.695Z ORB2738 224 118 953 1986-06-04T22:53:33.164Z 1986-06-04T23:53:21.172Z ORB2739 64 118 953 1986-06-05T23:19:25.750Z 1986-06-05T23:32:51.750Z ORB2740 346 118 953 1986-06-06T22:53:34.695Z 1986-06-06T23:53:25.188Z ORB2741 116 118 953 1986-06-07T23:17:13.305Z 1986-06-07T23:53:26.773Z ORB2742 386 118 953 1986-06-08T22:53:46.328Z 1986-06-08T23:53:37.656Z ORB2743 190 118 953 1986-06-09T22:54:07.352Z 1986-06-09T23:53:38.852Z ORB2744 388 118 953 1986-06-10T22:53:59.359Z 1986-06-10T23:53:51.391Z ORB2745 190 118 953 1986-06-11T22:54:21.961Z 1986-06-11T23:53:54.961Z ORB2746 75 118 953 1986-06-12T23:14:40.438Z 1986-06-12T23:37:58.492Z ORB2747 387 118 953 1986-06-13T22:54:25.016Z 1986-06-13T23:54:16.469Z ORB2748 133 118 953 1986-06-14T22:54:49.578Z 1986-06-14T23:54:25.539Z ORB2750 199 118 953 1986-06-16T22:54:54.672Z 1986-06-16T23:54:43.695Z ORB2751 444 118 953 1986-06-17T22:55:09.219Z 1986-06-17T23:54:59.703Z ORB2753 66 118 953 1986-06-19T23:13:28.281Z 1986-06-19T23:40:46.289Z ORB2754 437 118 953 1986-06-20T22:55:44.695Z 1986-06-20T23:55:35.820Z ORB2755 203 118 953 1986-06-21T22:55:55.336Z 1986-06-21T23:55:53.352Z ORB2761 432 118 953 1986-06-27T22:57:23.516Z 1986-06-27T23:57:17.422Z ORB2762 195 118 953 1986-06-28T22:57:36.047Z 1986-06-28T23:57:31.062Z ORB2763 435 118 953 1986-06-29T22:57:54.406Z 1986-06-29T23:57:49.969Z ORB2764 195 118 953 1986-06-30T22:58:32.102Z 1986-06-30T23:58:10.117Z ORB2766 194 118 953 1986-07-02T22:59:04.148Z 1986-07-02T23:58:49.164Z ORB2767 77 118 953 1986-07-03T23:13:02.680Z 1986-07-03T23:44:58.688Z ORB2768 205 118 953 1986-07-04T23:12:29.195Z 1986-07-04T23:45:53.203Z ORB2769 194 118 953 1986-07-05T22:59:45.719Z 1986-07-05T23:59:43.734Z ORB2770 438 118 953 1986-07-06T23:00:05.500Z 1986-07-06T23:59:56.188Z ORB2771 194 118 953 1986-07-07T23:00:19.758Z 1986-07-08T00:00:16.773Z ORB2772 319 118 953 1986-07-08T23:00:38.398Z 1986-07-08T23:54:01.180Z ORB2773 235 118 953 1986-07-09T23:00:54.500Z 1986-07-10T00:00:43.566Z ORB2774 71 118 953 1986-07-10T23:15:59.352Z 1986-07-10T23:46:39.359Z ORB2775 355 118 953 1986-07-11T23:01:26.531Z 1986-07-12T00:01:17.844Z ORB2776 238 118 953 1986-07-12T23:01:43.141Z 1986-07-13T00:01:38.645Z ORB2777 324 118 953 1986-07-13T23:01:58.984Z 1986-07-14T00:01:49.693Z ORB2778 233 118 953 1986-07-14T23:02:13.922Z 1986-07-15T00:02:09.741Z ORB2779 352 118 953 1986-07-15T23:02:35.867Z 1986-07-16T00:02:21.478Z ORB2780 227 118 953 1986-07-16T23:02:50.984Z 1986-07-17T00:02:34.050Z ORB2786 339 118 953 1986-07-22T23:04:26.602Z 1986-07-23T00:04:14.463Z ORB2787 301 118 953 1986-07-23T23:04:31.867Z 1986-07-24T00:04:30.266Z ORB2788 74 118 953 1986-07-24T23:20:09.445Z 1986-07-24T23:48:53.453Z ORB2789 366 118 953 1986-07-25T23:05:03.938Z 1986-07-26T00:04:49.403Z ORB2790 289 118 953 1986-07-26T23:05:15.133Z 1986-07-27T00:05:03.426Z ORB2791 306 118 953 1986-07-27T23:05:25.258Z 1986-07-28T00:05:15.964Z ORB2793 367 118 953 1986-07-29T23:05:44.758Z 1986-07-30T00:05:35.891Z ORB2794 284 118 953 1986-07-30T23:05:53.641Z 1986-07-31T00:05:43.455Z ORB2795 62 118 953 1986-07-31T23:24:00.406Z 1986-07-31T23:43:13.914Z 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.