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 ---------------------------------------------------------------------------- ORB0100 569 118 953 1979-03-14T18:26:10.398Z 1979-03-14T19:26:07.758Z ORB0101 444 118 953 1979-03-15T18:33:07.867Z 1979-03-15T19:24:28.875Z ORB0102 538 118 953 1979-03-16T18:35:23.938Z 1979-03-16T19:35:21.312Z ORB0103 568 118 953 1979-03-17T18:39:59.914Z 1979-03-17T19:39:57.383Z ORB0104 547 118 953 1979-03-18T18:44:36.891Z 1979-03-18T19:42:15.570Z ORB0105 569 118 953 1979-03-19T18:49:11.609Z 1979-03-19T19:49:02.633Z ORB0106 572 118 953 1979-03-20T18:53:43.852Z 1979-03-20T19:53:41.094Z ORB0107 541 118 953 1979-03-21T18:58:15.250Z 1979-03-21T19:58:12.570Z ORB0108 556 118 953 1979-03-22T19:02:48.508Z 1979-03-22T20:02:39.484Z ORB0109 506 118 953 1979-03-23T19:07:26.008Z 1979-03-23T20:00:59.000Z ORB0110 571 118 953 1979-03-24T19:11:49.648Z 1979-03-24T20:11:40.570Z ORB0111 565 118 953 1979-03-25T19:16:16.836Z 1979-03-25T20:16:14.156Z ORB0112 567 118 953 1979-03-26T19:20:45.523Z 1979-03-26T20:20:36.555Z ORB0113 570 118 953 1979-03-27T19:25:11.625Z 1979-03-27T20:25:02.742Z ORB0114 570 118 953 1979-03-28T19:29:39.609Z 1979-03-28T20:29:30.641Z ORB0115 479 118 953 1979-03-29T19:34:00.461Z 1979-03-29T20:33:57.898Z ORB0116 504 118 953 1979-03-30T19:38:27.000Z 1979-03-30T20:38:17.938Z ORB0117 508 118 953 1979-03-31T19:42:52.664Z 1979-03-31T20:36:25.875Z ORB0118 563 118 953 1979-04-01T19:47:08.406Z 1979-04-01T20:46:59.516Z ORB0119 569 118 953 1979-04-02T19:51:28.719Z 1979-04-02T20:51:19.828Z ORB0120 565 118 953 1979-04-03T19:55:46.336Z 1979-04-03T20:55:37.414Z ORB0121 571 118 953 1979-04-04T20:00:02.422Z 1979-04-04T20:59:53.266Z ORB0122 559 118 953 1979-04-05T20:04:15.359Z 1979-04-05T21:04:06.602Z ORB0123 560 118 953 1979-04-06T20:08:27.836Z 1979-04-06T21:08:18.992Z ORB0124 568 118 953 1979-04-07T20:12:35.977Z 1979-04-07T21:12:27.023Z ORB0125 510 118 953 1979-04-08T20:16:49.406Z 1979-04-08T21:10:22.430Z ORB0126 565 118 953 1979-04-09T20:20:45.992Z 1979-04-09T21:20:37.031Z ORB0127 563 118 953 1979-04-10T20:24:40.750Z 1979-04-10T21:24:38.195Z ORB0128 559 118 953 1979-04-11T20:28:38.016Z 1979-04-11T21:28:29.219Z ORB0129 569 118 953 1979-04-12T20:32:30.250Z 1979-04-12T21:32:21.312Z ORB0130 566 118 953 1979-04-13T20:36:17.461Z 1979-04-13T21:36:08.492Z ORB0131 557 118 953 1979-04-14T20:39:58.164Z 1979-04-14T21:39:49.094Z ORB0132 571 118 953 1979-04-15T20:43:31.914Z 1979-04-15T21:43:22.852Z ORB0133 445 118 953 1979-04-16T20:47:02.984Z 1979-04-16T21:34:37.023Z ORB0134 566 118 953 1979-04-17T20:50:17.406Z 1979-04-17T21:50:08.484Z ORB0135 567 118 953 1979-04-18T20:53:22.695Z 1979-04-18T21:53:20.055Z ORB0136 567 118 953 1979-04-19T20:56:23.398Z 1979-04-19T21:56:14.531Z ORB0137 570 118 953 1979-04-20T20:59:14.406Z 1979-04-20T21:59:05.516Z ORB0138 570 118 953 1979-04-21T21:01:58.922Z 1979-04-21T22:01:49.750Z ORB0139 168 118 953 1979-04-22T21:04:33.734Z 1979-04-22T21:39:12.766Z ORB0140 562 118 953 1979-04-23T21:07:04.539Z 1979-04-23T22:06:55.617Z ORB0141 425 118 953 1979-04-24T21:09:40.586Z 1979-04-24T21:57:08.328Z ORB0142 548 118 953 1979-04-25T21:11:42.727Z 1979-04-25T22:11:39.945Z ORB0143 565 118 953 1979-04-26T21:13:17.484Z 1979-04-26T22:13:14.828Z ORB0144 566 118 953 1979-04-27T21:14:42.703Z 1979-04-27T22:14:39.852Z ORB0145 567 118 953 1979-04-28T21:15:57.805Z 1979-04-28T22:15:48.680Z ORB0146 567 118 953 1979-04-29T21:16:56.219Z 1979-04-29T22:16:47.125Z ORB0147 523 118 953 1979-04-30T21:17:44.680Z 1979-04-30T22:17:35.758Z ORB0148 554 118 953 1979-05-01T21:17:53.406Z 1979-05-01T22:17:44.625Z ORB0149 565 118 953 1979-05-02T21:17:43.453Z 1979-05-02T22:17:34.562Z ORB0150 570 118 953 1979-05-03T21:17:20.844Z 1979-05-03T22:17:11.781Z ORB0151 563 118 953 1979-05-04T21:16:50.102Z 1979-05-04T22:16:47.555Z ORB0152 568 118 953 1979-05-05T21:16:16.406Z 1979-05-05T22:16:07.531Z ORB0153 570 118 953 1979-05-06T21:15:36.055Z 1979-05-06T22:15:33.352Z ORB0154 569 118 953 1979-05-07T21:14:54.242Z 1979-05-07T22:14:51.430Z ORB0155 555 118 953 1979-05-08T21:14:03.953Z 1979-05-08T22:13:54.969Z ORB0156 564 118 953 1979-05-09T21:12:04.852Z 1979-05-09T22:11:55.883Z ORB0157 450 118 953 1979-05-10T21:09:47.820Z 1979-05-10T21:57:21.844Z ORB0158 565 118 953 1979-05-11T21:07:15.133Z 1979-05-11T22:07:12.391Z ORB0159 570 118 953 1979-05-12T21:04:41.211Z 1979-05-12T22:04:38.648Z ORB0160 561 118 953 1979-05-13T21:02:00.625Z 1979-05-13T22:01:57.891Z ORB0161 561 118 953 1979-05-14T20:59:18.516Z 1979-05-14T21:59:09.516Z ORB0162 568 118 953 1979-05-15T20:56:33.516Z 1979-05-15T21:56:30.656Z ORB0163 561 118 953 1979-05-16T20:53:32.344Z 1979-05-16T21:53:29.719Z ORB0164 559 118 953 1979-05-17T20:49:48.375Z 1979-05-17T21:49:45.609Z ORB0165 449 118 953 1979-05-18T20:46:05.484Z 1979-05-18T21:33:33.039Z ORB0166 569 118 953 1979-05-19T20:41:39.133Z 1979-05-19T21:41:36.234Z ORB0167 561 118 953 1979-05-20T20:37:32.992Z 1979-05-20T21:37:24.023Z ORB0168 561 118 953 1979-05-21T20:33:16.203Z 1979-05-21T21:33:13.703Z ORB0169 564 118 953 1979-05-22T20:29:02.156Z 1979-05-22T21:28:59.547Z ORB0170 566 118 953 1979-05-23T20:24:48.297Z 1979-05-23T21:24:39.422Z ORB0171 546 118 953 1979-05-24T20:20:11.711Z 1979-05-24T21:20:09.008Z ORB0172 538 118 953 1979-05-25T20:14:17.047Z 1979-05-25T21:14:08.477Z ORB0173 449 118 953 1979-05-26T20:08:18.594Z 1979-05-26T20:55:46.133Z ORB0174 469 118 953 1979-05-27T20:01:44.758Z 1979-05-27T21:01:41.328Z ORB0175 565 118 953 1979-05-28T19:55:19.586Z 1979-05-28T20:55:17.070Z ORB0176 442 118 953 1979-05-29T19:48:45.227Z 1979-05-29T20:36:19.328Z ORB0177 564 118 953 1979-05-30T19:41:20.945Z 1979-05-30T20:41:05.586Z ORB0178 388 118 953 1979-05-31T19:33:08.039Z 1979-05-31T20:21:07.062Z ORB0179 565 118 953 1979-06-01T19:41:37.078Z 1979-06-01T20:41:28.172Z ORB0180 565 118 953 1979-06-02T19:49:45.805Z 1979-06-02T20:49:36.789Z ORB0181 494 118 953 1979-06-03T19:57:47.805Z 1979-06-03T20:57:45.055Z ORB0182 377 118 953 1979-06-04T20:05:48.430Z 1979-06-04T21:05:44.336Z ORB0183 563 118 953 1979-06-05T20:13:50.594Z 1979-06-05T21:13:47.734Z ORB0184 515 118 953 1979-06-06T20:21:35.508Z 1979-06-06T21:21:32.781Z ORB0185 538 118 953 1979-06-07T20:28:01.695Z 1979-06-07T21:27:52.531Z ORB0186 501 118 953 1979-06-08T20:34:09.305Z 1979-06-08T21:34:06.523Z ORB0188 565 118 953 1979-06-10T20:46:04.367Z 1979-06-10T21:45:55.250Z ORB0189 559 118 953 1979-06-11T20:51:54.594Z 1979-06-11T21:51:45.664Z ORB0190 561 118 953 1979-06-12T20:57:39.484Z 1979-06-12T21:57:30.562Z ORB0191 338 118 953 1979-06-13T21:27:43.250Z 1979-06-13T22:03:12.750Z ORB0192 40 118 953 1979-06-14T21:23:31.680Z 1979-06-14T21:53:45.688Z ORB0194 440 118 953 1979-06-16T21:16:59.258Z 1979-06-16T22:04:14.281Z ORB0195 571 118 953 1979-06-17T21:20:21.164Z 1979-06-17T22:20:12.250Z ORB0197 396 118 953 1979-06-19T21:27:09.320Z 1979-06-19T22:14:49.578Z ORB0198 560 118 953 1979-06-20T21:30:19.297Z 1979-06-20T22:30:16.289Z 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.