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 ---------------------------------------------------------------------------- ORB0700 140 118 953 1980-11-04T19:24:54.242Z 1980-11-04T20:23:55.227Z ORB0701 285 118 953 1980-11-05T19:27:23.883Z 1980-11-05T20:26:26.398Z ORB0702 273 118 953 1980-11-06T19:30:06.016Z 1980-11-06T20:29:14.023Z ORB0703 291 118 953 1980-11-07T19:32:29.156Z 1980-11-07T20:31:45.648Z ORB0704 283 118 953 1980-11-08T19:35:02.797Z 1980-11-08T20:34:20.781Z ORB0705 225 118 953 1980-11-09T19:37:44.930Z 1980-11-09T20:37:10.898Z ORB0706 287 118 953 1980-11-10T19:40:18.570Z 1980-11-10T20:39:28.539Z ORB0707 142 118 953 1980-11-11T19:42:43.703Z 1980-11-11T20:42:19.719Z ORB0710 190 118 953 1980-11-14T19:50:44.078Z 1980-11-14T20:48:34.609Z ORB0711 245 118 953 1980-11-15T19:53:14.188Z 1980-11-15T20:52:26.734Z ORB0712 192 118 953 1980-11-16T19:55:48.367Z 1980-11-16T20:54:27.867Z ORB0713 253 118 953 1980-11-17T19:58:25.477Z 1980-11-17T20:57:04.539Z ORB0714 252 118 953 1980-11-18T20:01:18.633Z 1980-11-18T21:00:55.664Z ORB0715 245 118 953 1980-11-19T20:03:51.750Z 1980-11-19T21:03:34.766Z ORB0716 243 118 953 1980-11-20T20:06:27.852Z 1980-11-20T21:05:55.391Z ORB0717 108 118 953 1980-11-21T20:09:05.031Z 1980-11-21T21:08:54.047Z ORB0718 86 118 953 1980-11-22T20:11:45.633Z 1980-11-22T21:11:36.695Z ORB0719 184 118 953 1980-11-23T20:14:40.258Z 1980-11-23T21:13:02.773Z ORB0720 253 118 953 1980-11-24T20:17:09.438Z 1980-11-24T21:16:29.711Z ORB0721 257 118 953 1980-11-25T20:19:49.773Z 1980-11-25T21:19:03.305Z ORB0722 257 118 953 1980-11-26T20:22:33.922Z 1980-11-26T21:21:30.219Z ORB0723 232 118 953 1980-11-27T20:25:45.805Z 1980-11-27T21:19:12.805Z ORB0724 231 118 953 1980-11-28T20:28:01.406Z 1980-11-28T21:26:58.703Z ORB0725 227 118 953 1980-11-29T20:30:57.805Z 1980-11-29T21:30:39.062Z ORB0726 112 118 953 1980-11-30T20:33:47.133Z 1980-11-30T21:32:50.180Z ORB0727 250 118 953 1980-12-01T20:36:22.297Z 1980-12-01T21:36:12.812Z ORB0728 240 118 953 1980-12-02T20:39:17.883Z 1980-12-02T21:38:21.430Z ORB0729 247 118 953 1980-12-03T20:41:52.055Z 1980-12-03T21:40:49.539Z ORB0730 230 118 953 1980-12-04T20:44:48.641Z 1980-12-04T21:43:55.680Z ORB0731 248 118 953 1980-12-05T20:47:42.789Z 1980-12-05T21:47:22.812Z ORB0732 250 118 953 1980-12-06T20:50:26.383Z 1980-12-06T21:49:34.422Z ORB0733 195 118 953 1980-12-07T20:53:21.531Z 1980-12-07T21:52:58.555Z ORB0734 243 118 953 1980-12-08T20:56:05.117Z 1980-12-08T21:55:13.664Z ORB0735 237 118 953 1980-12-09T20:58:57.766Z 1980-12-09T21:57:26.773Z ORB0736 235 118 953 1980-12-10T21:01:36.359Z 1980-12-10T22:00:50.898Z ORB0737 238 118 953 1980-12-11T21:04:27.508Z 1980-12-11T22:03:05.516Z ORB0738 250 118 953 1980-12-12T21:07:33.094Z 1980-12-12T22:05:55.664Z ORB0739 243 118 953 1980-12-13T21:10:11.258Z 1980-12-13T22:10:02.273Z ORB0740 181 118 953 1980-12-14T21:13:01.344Z 1980-12-14T22:11:58.391Z ORB0741 212 118 953 1980-12-15T21:15:57.492Z 1980-12-15T22:03:36.430Z ORB0742 376 118 953 1980-12-16T21:18:42.391Z 1980-12-16T22:18:16.359Z ORB0743 365 118 953 1980-12-17T21:21:33.258Z 1980-12-17T22:20:47.781Z ORB0744 312 118 953 1980-12-18T21:24:23.328Z 1980-12-18T22:23:38.141Z ORB0745 353 118 953 1980-12-19T21:27:15.547Z 1980-12-19T22:26:52.992Z ORB0746 396 118 953 1980-12-20T21:30:06.922Z 1980-12-20T22:29:43.109Z ORB0747 328 118 953 1980-12-21T21:32:59.797Z 1980-12-21T22:32:33.523Z ORB0748 360 118 953 1980-12-22T21:35:52.820Z 1980-12-22T22:35:27.141Z ORB0749 384 118 953 1980-12-23T21:38:44.555Z 1980-12-23T22:38:20.008Z ORB0750 390 118 953 1980-12-24T21:41:38.953Z 1980-12-24T22:40:51.883Z ORB0751 331 118 953 1980-12-25T21:44:28.477Z 1980-12-25T22:26:20.664Z ORB0752 390 118 953 1980-12-26T21:47:17.102Z 1980-12-26T22:46:51.117Z ORB0753 390 118 953 1980-12-27T21:50:12.562Z 1980-12-27T22:49:41.688Z ORB0754 330 118 953 1980-12-28T21:52:58.469Z 1980-12-28T22:52:36.844Z ORB0755 256 118 953 1980-12-29T21:55:54.930Z 1980-12-29T22:55:23.703Z ORB0756 464 118 953 1980-12-30T21:58:41.125Z 1980-12-30T22:58:23.320Z ORB0757 471 118 953 1980-12-31T22:01:29.703Z 1980-12-31T23:01:19.180Z ORB0758 461 118 953 1981-01-01T22:04:19.562Z 1981-01-01T23:04:01.039Z ORB0759 470 118 953 1981-01-02T22:07:12.625Z 1981-01-02T23:06:50.398Z ORB0760 464 118 953 1981-01-03T22:09:58.031Z 1981-01-03T23:09:42.508Z ORB0761 165 118 953 1981-01-04T22:15:00.836Z 1981-01-04T23:12:19.305Z ORB0762 298 118 953 1981-01-05T22:15:39.930Z 1981-01-05T23:15:32.461Z ORB0763 282 118 953 1981-01-06T22:18:30.000Z 1981-01-06T23:17:39.523Z ORB0764 272 118 953 1981-01-07T22:21:25.117Z 1981-01-07T23:19:46.609Z ORB0765 554 118 953 1981-01-08T22:23:54.555Z 1981-01-08T23:23:45.273Z ORB0766 147 118 953 1981-01-09T22:26:42.758Z 1981-01-09T22:42:02.609Z ORB0767 543 118 953 1981-01-10T22:31:42.234Z 1981-01-10T23:29:20.500Z ORB0768 500 118 953 1981-01-11T22:32:13.367Z 1981-01-11T23:31:58.859Z ORB0769 269 118 953 1981-01-12T22:35:02.406Z 1981-01-12T23:34:36.172Z ORB0770 229 118 953 1981-01-13T22:37:50.289Z 1981-01-13T23:37:29.555Z ORB0771 241 118 953 1981-01-14T22:40:36.133Z 1981-01-14T23:40:09.648Z ORB0772 227 118 953 1981-01-15T22:43:24.227Z 1981-01-15T23:42:52.742Z ORB0773 233 118 953 1981-01-16T22:46:09.312Z 1981-01-16T23:45:36.578Z ORB0774 569 118 953 1981-01-17T22:48:30.203Z 1981-01-17T23:48:27.391Z ORB0775 502 118 953 1981-01-18T22:51:12.695Z 1981-01-18T23:51:07.883Z ORB0776 571 118 953 1981-01-19T22:53:54.023Z 1981-01-19T23:53:45.016Z ORB0777 238 118 953 1981-01-20T22:56:45.961Z 1981-01-20T23:56:16.477Z ORB0778 570 118 953 1981-01-21T22:59:10.328Z 1981-01-21T23:59:01.359Z ORB0779 562 118 953 1981-01-22T23:01:50.883Z 1981-01-23T00:01:41.969Z ORB0780 542 118 953 1981-01-23T23:04:28.766Z 1981-01-24T00:00:00.000Z ORB0781 571 118 953 1981-01-24T23:07:02.852Z 1981-01-25T00:07:00.126Z ORB0783 843 118 953 1981-01-26T23:12:18.062Z 1981-01-27T00:12:09.087Z ORB0784 240 118 953 1981-01-27T23:14:59.180Z 1981-01-28T00:14:38.444Z ORB0785 232 118 953 1981-01-28T23:17:36.023Z 1981-01-29T00:17:19.292Z ORB0786 93 118 953 1981-01-29T23:20:20.117Z 1981-01-30T00:19:58.142Z ORB0787 571 118 953 1981-01-30T23:22:39.969Z 1981-01-31T00:22:30.944Z ORB0788 571 118 953 1981-01-31T23:25:14.469Z 1981-02-01T00:25:05.340Z ORB0789 570 118 953 1981-02-01T23:27:48.148Z 1981-02-02T00:27:39.424Z ORB0790 571 118 953 1981-02-02T23:30:18.094Z 1981-02-03T00:30:09.294Z ORB0791 350 118 953 1981-02-03T23:32:50.172Z 1981-02-04T00:32:43.715Z ORB0792 321 118 953 1981-02-04T23:35:22.055Z 1981-02-05T00:35:08.328Z ORB0793 305 118 953 1981-02-05T23:37:17.672Z 1981-02-06T00:36:56.947Z ORB0794 561 118 953 1981-02-06T23:38:27.742Z 1981-02-07T00:38:18.943Z ORB0796 274 118 953 1981-02-08T23:40:41.008Z 1981-02-09T00:40:31.034Z ORB0797 568 118 953 1981-02-09T23:41:50.359Z 1981-02-10T00:41:47.735Z ORB0798 286 118 953 1981-02-10T23:42:59.961Z 1981-02-11T00:42:50.972Z ORB0799 316 118 953 1981-02-11T23:44:12.062Z 1981-02-12T00:43:55.587Z 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.