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 ---------------------------------------------------------------------------- ORB3900 288 118 953 1989-08-10T02:27:17.202Z 1989-08-10T02:47:02.210Z ORB3901 508 118 953 1989-08-11T02:37:06.668Z 1989-08-11T04:26:13.706Z ORB3902 615 118 953 1989-08-12T02:27:28.146Z 1989-08-12T04:19:19.183Z ORB3903 617 118 953 1989-08-13T02:27:57.592Z 1989-08-13T04:19:14.629Z ORB3904 613 118 953 1989-08-14T02:27:24.067Z 1989-08-14T04:19:02.107Z ORB3905 78 118 953 1989-08-15T03:09:40.567Z 1989-08-15T03:42:00.578Z ORB3906 616 118 953 1989-08-16T02:28:06.034Z 1989-08-16T04:26:47.076Z ORB3907 611 118 953 1989-08-17T02:28:02.508Z 1989-08-17T04:18:48.544Z ORB3908 618 118 953 1989-08-18T02:28:11.984Z 1989-08-18T04:27:00.025Z ORB3909 616 118 953 1989-08-19T02:27:58.458Z 1989-08-19T04:27:10.499Z ORB3910 610 118 953 1989-08-20T02:28:27.937Z 1989-08-20T04:27:14.977Z ORB3911 658 118 953 1989-08-21T02:28:19.413Z 1989-08-21T04:23:26.452Z ORB3912 610 118 953 1989-08-22T02:28:10.890Z 1989-08-22T04:27:16.929Z ORB3913 486 118 953 1989-08-23T02:28:21.363Z 1989-08-23T04:25:57.403Z ORB3914 648 118 953 1989-08-24T02:28:15.068Z 1989-08-24T04:23:14.110Z ORB3915 371 118 953 1989-08-25T02:27:46.310Z 1989-08-25T03:43:09.326Z ORB3916 2 118 953 1989-08-26T03:38:05.210Z 1989-08-26T03:38:23.187Z ORB3917 650 118 953 1989-08-27T02:27:53.202Z 1989-08-27T04:27:24.242Z ORB3918 676 118 953 1989-08-28T02:28:36.651Z 1989-08-28T04:22:53.688Z ORB3919 161 118 953 1989-08-29T03:15:44.572Z 1989-08-29T04:27:27.141Z ORB3920 686 118 953 1989-08-30T02:27:57.552Z 1989-08-30T04:22:57.590Z ORB3921 658 118 953 1989-08-31T02:28:44.002Z 1989-08-31T04:27:26.041Z ORB3922 684 118 953 1989-09-01T02:28:18.452Z 1989-09-01T04:22:45.489Z ORB3923 15 118 953 1989-09-02T02:28:04.899Z 1989-09-02T02:29:38.900Z ORB3924 446 118 953 1989-09-03T02:28:10.355Z 1989-09-03T03:56:21.863Z ORB3925 897 118 953 1989-09-04T02:27:26.809Z 1989-09-04T04:27:04.851Z ORB3926 892 118 953 1989-09-05T02:27:21.296Z 1989-09-05T04:26:59.338Z ORB3927 876 118 953 1989-09-06T02:27:44.784Z 1989-09-06T04:26:56.823Z ORB3928 861 118 953 1989-09-07T02:27:13.242Z 1989-09-07T04:26:48.283Z ORB3929 902 118 953 1989-09-08T02:27:00.701Z 1989-09-08T04:26:43.741Z ORB3930 872 118 953 1989-09-09T02:27:09.162Z 1989-09-09T04:17:16.200Z ORB3931 459 118 953 1989-09-10T02:26:46.651Z 1989-09-10T03:22:33.884Z ORB3932 854 118 953 1989-09-11T02:27:10.109Z 1989-09-11T04:26:09.150Z ORB3933 838 118 953 1989-09-12T02:27:00.599Z 1989-09-12T04:26:02.639Z ORB3934 403 118 953 1989-09-13T02:26:52.088Z 1989-09-13T03:31:18.099Z ORB3935 774 118 953 1989-09-14T02:36:22.582Z 1989-09-14T04:16:55.866Z ORB3936 873 118 953 1989-09-15T02:26:57.287Z 1989-09-15T04:25:37.328Z ORB3937 647 118 953 1989-09-16T02:26:16.466Z 1989-09-16T04:22:21.757Z ORB3938 618 118 953 1989-09-17T02:25:46.708Z 1989-09-17T04:25:10.000Z ORB3939 620 118 953 1989-09-18T02:26:05.418Z 1989-09-18T04:25:00.209Z ORB3940 619 118 953 1989-09-19T02:25:44.362Z 1989-09-19T04:24:48.903Z ORB3941 621 118 953 1989-09-20T02:25:42.320Z 1989-09-20T04:24:37.111Z ORB3942 8 118 953 1989-09-21T02:25:30.513Z 1989-09-21T02:26:36.514Z ORB3943 566 118 953 1989-09-22T02:24:50.205Z 1989-09-22T04:24:13.496Z ORB3944 609 118 953 1989-09-23T02:25:05.927Z 1989-09-23T04:24:00.718Z ORB3945 38 118 953 1989-09-24T02:24:55.413Z 1989-09-24T02:30:45.666Z ORB3946 580 118 953 1989-09-25T02:24:25.103Z 1989-09-25T04:23:38.644Z ORB3947 607 118 953 1989-09-26T02:24:13.068Z 1989-09-26T04:23:26.609Z ORB3948 630 118 953 1989-09-27T02:24:00.474Z 1989-09-27T04:23:14.014Z ORB3949 75 118 953 1989-09-28T03:16:43.447Z 1989-09-28T03:28:22.416Z ORB3950 79 118 953 1989-09-29T02:23:26.659Z 1989-09-29T02:35:43.163Z ORB3951 631 118 953 1989-09-30T02:23:14.104Z 1989-09-30T04:22:37.395Z ORB3953 641 118 953 1989-10-02T02:23:09.997Z 1989-10-02T04:22:13.787Z ORB3954 633 118 953 1989-10-03T02:23:17.711Z 1989-10-03T04:22:02.751Z ORB3955 448 118 953 1989-10-04T02:22:47.380Z 1989-10-04T03:45:47.407Z ORB3956 631 118 953 1989-10-05T02:22:17.331Z 1989-10-05T04:21:40.620Z ORB3957 642 118 953 1989-10-06T02:21:58.296Z 1989-10-06T04:21:20.836Z ORB3958 655 118 953 1989-10-07T02:21:37.512Z 1989-10-07T04:21:09.802Z ORB3959 646 118 953 1989-10-08T02:21:47.712Z 1989-10-08T04:21:01.251Z ORB3960 49 118 953 1989-10-09T02:21:43.913Z 1989-10-09T02:29:17.665Z ORB3961 76 118 953 1989-10-10T03:14:08.653Z 1989-10-10T03:25:57.358Z ORB3962 660 118 953 1989-10-11T02:21:30.352Z 1989-10-11T04:20:25.141Z ORB3963 647 118 953 1989-10-12T02:21:21.319Z 1989-10-12T04:20:16.110Z ORB3964 933 118 953 1989-10-13T02:20:31.538Z 1989-10-13T04:20:11.579Z ORB3965 952 118 953 1989-10-14T02:20:29.027Z 1989-10-14T04:20:02.568Z ORB3966 956 118 953 1989-10-15T02:20:14.517Z 1989-10-15T04:19:58.558Z ORB3967 887 118 953 1989-10-16T02:20:32.473Z 1989-10-16T04:19:44.514Z ORB3968 958 118 953 1989-10-17T02:20:18.946Z 1989-10-17T04:19:43.988Z ORB3969 1001 118 953 1989-10-18T02:20:12.435Z 1989-10-18T04:19:33.477Z ORB3970 77 118 953 1989-10-19T03:12:42.238Z 1989-10-19T03:24:39.931Z ORB3975 420 118 953 1989-10-24T02:19:46.080Z 1989-10-24T04:19:06.621Z ORB3976 953 118 953 1989-10-25T02:22:05.573Z 1989-10-25T04:19:04.116Z ORB3977 794 118 953 1989-10-26T02:19:41.062Z 1989-10-26T04:18:56.604Z ORB3978 612 118 953 1989-10-27T02:19:34.017Z 1989-10-27T04:19:01.059Z ORB3979 1140 118 953 1989-10-28T02:19:26.972Z 1989-10-28T04:19:02.514Z ORB3980 603 118 953 1989-10-29T02:19:45.960Z 1989-10-29T04:19:00.501Z ORB3981 1136 118 953 1989-10-30T02:19:52.434Z 1989-10-30T04:19:02.976Z ORB3982 73 118 953 1989-10-31T03:12:52.678Z 1989-10-31T03:24:12.920Z ORB3983 1104 118 953 1989-11-01T02:19:55.408Z 1989-11-01T04:18:59.450Z ORB3984 250 118 953 1989-11-02T02:19:44.889Z 1989-11-02T03:24:17.636Z ORB3985 1140 118 953 1989-11-03T02:19:35.361Z 1989-11-03T04:19:11.403Z ORB3986 7 118 953 1989-11-04T04:18:34.399Z 1989-11-04T04:19:12.399Z ORB3987 790 118 953 1989-11-05T02:19:41.330Z 1989-11-05T04:19:18.871Z ORB3988 787 118 953 1989-11-06T02:19:45.315Z 1989-11-06T04:19:22.856Z ORB3989 730 118 953 1989-11-07T02:20:15.293Z 1989-11-07T04:19:23.835Z ORB3990 1034 118 953 1989-11-08T02:28:32.787Z 1989-11-08T04:19:31.827Z ORB3991 460 118 953 1989-11-09T02:20:20.257Z 1989-11-09T03:08:31.773Z ORB3992 817 118 953 1989-11-10T02:20:19.746Z 1989-11-10T04:19:46.788Z ORB3993 1130 118 953 1989-11-11T02:20:26.200Z 1989-11-11T04:19:49.243Z ORB3994 388 118 953 1989-11-12T02:20:32.688Z 1989-11-12T03:25:04.677Z ORB3995 1139 118 953 1989-11-13T02:20:27.144Z 1989-11-13T04:20:02.685Z ORB3996 795 118 953 1989-11-14T02:20:34.131Z 1989-11-14T04:20:10.171Z ORB3997 396 118 953 1989-11-15T02:20:41.614Z 1989-11-15T03:25:30.578Z ORB3998 397 118 953 1989-11-16T02:20:43.597Z 1989-11-16T03:25:37.863Z ORB3999 378 118 953 1989-11-17T02:21:16.576Z 1989-11-17T03:25:42.085Z 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.