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 ---------------------------------------------------------------------------- ORB0001 395 118 953 1978-12-05T14:41:18.480Z 1978-12-05T15:41:07.148Z ORB0002 106 118 953 1978-12-06T14:23:22.715Z 1978-12-06T14:51:37.203Z ORB0003 75 118 953 1978-12-07T14:24:11.883Z 1978-12-07T14:36:19.371Z ORB0004 382 118 953 1978-12-08T14:10:14.914Z 1978-12-08T15:10:10.492Z ORB0005 97 118 953 1978-12-09T14:39:16.250Z 1978-12-09T15:06:01.258Z ORB0006 355 118 953 1978-12-10T14:26:16.211Z 1978-12-10T15:26:12.945Z ORB0007 451 118 953 1978-12-11T14:34:10.906Z 1978-12-11T15:34:06.535Z ORB0008 196 118 953 1978-12-12T14:54:10.094Z 1978-12-12T15:28:40.918Z ORB0009 255 118 953 1978-12-13T15:10:08.500Z 1978-12-13T15:49:24.117Z ORB0010 226 118 953 1978-12-14T14:59:31.973Z 1978-12-14T15:42:41.684Z ORB0011 225 118 953 1978-12-15T15:16:07.852Z 1978-12-15T16:08:08.387Z ORB0012 383 118 953 1978-12-16T15:21:57.039Z 1978-12-16T16:17:31.688Z ORB0013 77 118 953 1978-12-17T15:48:15.254Z 1978-12-17T16:10:10.008Z ORB0014 454 118 953 1978-12-18T15:35:44.680Z 1978-12-18T16:35:32.195Z ORB0015 252 118 953 1978-12-19T15:44:35.273Z 1978-12-19T16:44:13.395Z ORB0016 171 118 953 1978-12-20T16:05:54.852Z 1978-12-20T16:48:37.324Z ORB0017 498 118 953 1978-12-21T16:01:59.789Z 1978-12-21T17:01:58.012Z ORB0018 485 118 953 1978-12-22T16:10:29.277Z 1978-12-22T17:10:21.406Z ORB0019 435 118 953 1978-12-23T16:18:47.809Z 1978-12-23T17:18:34.133Z ORB0020 299 118 953 1978-12-24T16:27:05.902Z 1978-12-24T17:05:10.320Z ORB0021 126 118 953 1978-12-25T16:55:58.504Z 1978-12-25T17:23:02.504Z ORB0022 485 118 953 1978-12-26T16:43:26.082Z 1978-12-26T17:43:16.703Z ORB0023 76 118 953 1978-12-27T17:13:53.684Z 1978-12-27T17:26:10.160Z ORB0024 157 118 953 1978-12-28T17:11:49.094Z 1978-12-28T17:48:39.066Z ORB0025 461 118 953 1978-12-29T17:11:47.727Z 1978-12-29T18:07:37.766Z ORB0026 444 118 953 1978-12-30T17:15:43.223Z 1978-12-30T18:15:31.203Z ORB0027 476 118 953 1978-12-31T17:23:46.762Z 1978-12-31T18:23:30.883Z ORB0028 496 118 953 1979-01-01T17:31:41.840Z 1979-01-01T18:31:27.586Z ORB0030 501 118 953 1979-01-03T17:47:24.180Z 1979-01-03T18:47:19.805Z ORB0031 76 118 953 1979-01-04T18:14:18.641Z 1979-01-04T18:26:45.602Z ORB0032 141 118 953 1979-01-05T18:09:41.617Z 1979-01-05T18:41:35.328Z ORB0033 486 118 953 1979-01-06T18:02:15.793Z 1979-01-06T19:02:05.523Z ORB0034 394 118 953 1979-01-07T18:07:11.289Z 1979-01-07T19:07:03.297Z ORB0037 121 118 953 1979-01-10T18:42:49.273Z 1979-01-10T19:09:18.023Z ORB0039 485 118 953 1979-01-12T18:31:00.859Z 1979-01-12T19:30:43.891Z ORB0040 100 118 953 1979-01-13T19:05:33.086Z 1979-01-13T19:35:07.078Z ORB0041 506 118 953 1979-01-14T18:39:36.523Z 1979-01-14T19:39:27.758Z ORB0042 500 118 953 1979-01-15T18:43:54.398Z 1979-01-15T19:43:45.430Z ORB0043 400 118 953 1979-01-16T18:48:33.578Z 1979-01-16T19:48:11.859Z ORB0044 397 118 953 1979-01-17T18:52:25.508Z 1979-01-17T19:52:14.555Z ORB0045 123 118 953 1979-01-18T19:26:47.695Z 1979-01-18T19:43:37.977Z ORB0046 405 118 953 1979-01-19T18:59:29.109Z 1979-01-19T19:59:22.133Z ORB0047 325 118 953 1979-01-20T19:03:00.703Z 1979-01-20T20:02:55.828Z ORB0048 404 118 953 1979-01-21T19:18:43.492Z 1979-01-21T20:06:22.516Z ORB0049 543 118 953 1979-01-22T19:10:04.555Z 1979-01-22T20:09:53.695Z ORB0050 482 118 953 1979-01-23T19:18:19.828Z 1979-01-23T20:13:25.367Z ORB0051 544 118 953 1979-01-24T19:16:53.602Z 1979-01-24T20:16:44.055Z ORB0052 370 118 953 1979-01-25T19:19:55.188Z 1979-01-25T20:19:07.469Z ORB0053 153 118 953 1979-01-26T19:44:27.383Z 1979-01-26T20:09:30.180Z ORB0054 525 118 953 1979-01-27T19:24:13.125Z 1979-01-27T20:24:04.562Z ORB0055 550 118 953 1979-01-28T19:26:36.016Z 1979-01-28T20:26:29.242Z ORB0056 324 118 953 1979-01-29T19:51:09.156Z 1979-01-29T20:28:56.672Z ORB0057 505 118 953 1979-01-30T19:36:08.820Z 1979-01-30T20:31:16.602Z ORB0058 551 118 953 1979-01-31T19:33:40.734Z 1979-01-31T20:33:33.266Z ORB0059 285 118 953 1979-02-01T19:34:36.891Z 1979-02-01T20:13:53.703Z ORB0060 376 118 953 1979-02-02T19:35:26.328Z 1979-02-02T20:35:18.125Z ORB0061 188 118 953 1979-02-03T19:58:39.273Z 1979-02-03T20:24:00.164Z ORB0062 492 118 953 1979-02-04T19:37:05.742Z 1979-02-04T20:36:06.469Z ORB0063 434 118 953 1979-02-05T19:37:57.438Z 1979-02-05T20:37:50.555Z ORB0064 349 118 953 1979-02-06T19:38:50.070Z 1979-02-06T20:38:43.852Z ORB0065 490 118 953 1979-02-07T19:39:25.094Z 1979-02-07T20:39:15.984Z ORB0066 542 118 953 1979-02-08T19:41:16.625Z 1979-02-08T20:38:55.648Z ORB0067 377 118 953 1979-02-09T19:43:55.789Z 1979-02-09T20:37:41.820Z ORB0068 527 118 953 1979-02-10T19:38:27.141Z 1979-02-10T20:38:24.578Z ORB0070 445 118 953 1979-02-12T19:38:10.781Z 1979-02-12T20:37:42.938Z ORB0071 59 118 953 1979-02-13T20:16:04.656Z 1979-02-13T20:22:10.297Z ORB0072 408 118 953 1979-02-14T19:37:39.812Z 1979-02-14T20:36:46.523Z ORB0073 203 118 953 1979-02-15T19:42:20.461Z 1979-02-15T20:35:21.836Z ORB0074 385 118 953 1979-02-16T19:33:56.617Z 1979-02-16T20:33:53.930Z ORB0075 188 118 953 1979-02-17T19:38:02.273Z 1979-02-17T20:07:13.789Z ORB0076 301 118 953 1979-02-18T19:30:57.938Z 1979-02-18T20:30:55.344Z ORB0077 562 118 953 1979-02-19T19:29:28.672Z 1979-02-19T20:29:26.000Z ORB0078 445 118 953 1979-02-20T19:28:03.094Z 1979-02-20T20:27:54.156Z ORB0079 536 118 953 1979-02-21T19:26:21.398Z 1979-02-21T20:26:11.922Z ORB0080 455 118 953 1979-02-22T19:24:22.055Z 1979-02-22T20:23:41.781Z ORB0081 572 118 953 1979-02-23T19:21:14.195Z 1979-02-23T20:21:11.289Z ORB0082 308 118 953 1979-02-24T19:45:47.102Z 1979-02-24T20:18:32.773Z ORB0083 82 118 953 1979-02-25T19:41:24.781Z 1979-02-25T19:53:48.289Z ORB0084 336 118 953 1979-02-26T19:16:49.883Z 1979-02-26T20:13:25.258Z ORB0085 493 118 953 1979-02-27T19:10:46.875Z 1979-02-27T20:10:37.609Z ORB0086 553 118 953 1979-02-28T19:07:30.750Z 1979-02-28T20:07:21.195Z ORB0087 571 118 953 1979-03-01T19:04:05.547Z 1979-03-01T20:04:02.906Z ORB0088 471 118 953 1979-03-02T19:00:44.523Z 1979-03-02T20:00:35.297Z ORB0090 556 118 953 1979-03-04T18:53:44.281Z 1979-03-04T19:53:41.562Z ORB0091 551 118 953 1979-03-05T18:50:18.797Z 1979-03-05T19:50:09.430Z ORB0092 568 118 953 1979-03-06T18:46:46.898Z 1979-03-06T19:46:37.680Z ORB0093 501 118 953 1979-03-07T18:43:33.953Z 1979-03-07T19:36:48.023Z ORB0094 564 118 953 1979-03-08T18:39:35.164Z 1979-03-08T19:39:32.727Z ORB0095 564 118 953 1979-03-09T18:36:01.516Z 1979-03-09T19:35:58.906Z ORB0096 468 118 953 1979-03-10T18:32:29.180Z 1979-03-10T19:32:20.008Z ORB0097 541 118 953 1979-03-11T18:28:48.117Z 1979-03-11T19:28:45.133Z ORB0098 551 118 953 1979-03-12T18:25:10.680Z 1979-03-12T19:25:07.961Z ORB0099 492 118 953 1979-03-13T18:21:31.586Z 1979-03-13T19:21:29.086Z 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.