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 ---------------------------------------------------------------------------- ORB1400 154 118 953 1982-10-06T01:06:07.185Z 1982-10-06T01:30:12.725Z ORB1401 121 118 953 1982-10-07T00:51:31.095Z 1982-10-07T01:51:22.121Z ORB1402 349 118 953 1982-10-08T00:52:30.428Z 1982-10-08T01:51:30.453Z ORB1403 336 118 953 1982-10-09T00:51:35.293Z 1982-10-09T01:40:28.063Z ORB1404 338 118 953 1982-10-10T00:51:36.903Z 1982-10-10T01:51:30.929Z ORB1405 433 118 953 1982-10-11T00:51:38.015Z 1982-10-11T01:51:32.989Z ORB1406 252 118 953 1982-10-12T00:51:46.884Z 1982-10-12T01:51:27.908Z ORB1407 145 118 953 1982-10-13T01:06:27.721Z 1982-10-13T01:30:52.449Z ORB1408 291 118 953 1982-10-14T00:51:46.846Z 1982-10-14T01:51:40.873Z ORB1409 295 118 953 1982-10-15T00:51:55.956Z 1982-10-15T01:51:34.980Z ORB1410 376 118 953 1982-10-16T00:51:52.542Z 1982-10-16T01:51:34.385Z ORB1411 83 118 953 1982-10-17T00:52:01.163Z 1982-10-17T01:51:52.163Z ORB1412 229 118 953 1982-10-18T00:54:28.243Z 1982-10-18T01:36:50.209Z ORB1413 235 118 953 1982-10-19T00:52:03.543Z 1982-10-19T01:52:00.572Z ORB1446 96 118 953 1982-11-21T00:53:45.525Z 1982-11-21T01:52:50.797Z ORB1447 269 118 953 1982-11-22T00:53:29.357Z 1982-11-22T01:53:07.880Z ORB1448 106 118 953 1982-11-23T00:53:32.430Z 1982-11-23T01:52:14.451Z ORB1450 103 118 953 1982-11-25T00:53:26.568Z 1982-11-25T01:52:16.338Z ORB1451 291 118 953 1982-11-26T00:52:57.885Z 1982-11-26T01:52:47.159Z ORB1452 299 118 953 1982-11-27T00:52:55.712Z 1982-11-27T01:52:34.985Z ORB1454 375 118 953 1982-11-29T00:52:37.871Z 1982-11-29T01:52:19.597Z ORB1455 231 118 953 1982-11-30T00:52:30.192Z 1982-11-30T01:35:33.209Z ORB1456 149 118 953 1982-12-01T01:08:54.742Z 1982-12-01T01:32:12.744Z ORB1457 563 118 953 1982-12-02T00:52:01.433Z 1982-12-02T01:51:52.358Z ORB1458 551 118 953 1982-12-03T00:53:53.930Z 1982-12-03T01:51:38.953Z ORB1459 571 118 953 1982-12-04T00:51:37.326Z 1982-12-04T01:51:28.050Z ORB1460 567 118 953 1982-12-05T00:51:25.603Z 1982-12-05T01:51:23.128Z ORB1461 572 118 953 1982-12-06T00:51:13.699Z 1982-12-06T01:51:11.224Z ORB1462 313 118 953 1982-12-07T00:51:00.272Z 1982-12-07T01:50:55.296Z ORB1464 307 118 953 1982-12-09T00:50:37.442Z 1982-12-09T01:50:31.466Z ORB1465 571 118 953 1982-12-10T00:50:23.234Z 1982-12-10T01:50:14.258Z ORB1466 478 118 953 1982-12-11T00:50:06.610Z 1982-12-11T01:50:04.233Z ORB1467 320 118 953 1982-12-12T00:50:03.200Z 1982-12-12T01:49:45.224Z ORB1468 483 118 953 1982-12-13T00:49:39.695Z 1982-12-13T01:49:31.168Z ORB1469 572 118 953 1982-12-14T00:49:22.921Z 1982-12-14T01:49:20.331Z ORB1470 150 118 953 1982-12-15T01:04:02.733Z 1982-12-15T01:28:17.723Z ORB1471 148 118 953 1982-12-16T01:03:15.082Z 1982-12-16T01:27:21.084Z ORB1472 571 118 953 1982-12-17T00:48:42.329Z 1982-12-17T01:48:33.355Z ORB1473 502 118 953 1982-12-18T00:48:25.841Z 1982-12-18T01:48:17.054Z ORB1474 571 118 953 1982-12-19T00:48:08.754Z 1982-12-19T01:47:59.757Z ORB1475 488 118 953 1982-12-20T00:47:51.572Z 1982-12-20T01:47:46.994Z ORB1476 156 118 953 1982-12-21T01:01:11.885Z 1982-12-21T01:26:08.782Z ORB1477 153 118 953 1982-12-22T01:02:03.243Z 1982-12-22T01:25:59.508Z ORB1479 158 118 953 1982-12-24T01:01:18.927Z 1982-12-24T01:26:02.730Z ORB1481 562 118 953 1982-12-26T00:46:19.960Z 1982-12-26T01:46:10.985Z ORB1482 571 118 953 1982-12-27T00:46:03.687Z 1982-12-27T01:45:54.712Z ORB1483 517 118 953 1982-12-28T00:45:51.706Z 1982-12-28T01:45:40.730Z ORB1484 74 118 953 1982-12-29T00:45:34.025Z 1982-12-29T01:10:07.579Z ORB1485 295 118 953 1982-12-30T00:45:20.949Z 1982-12-30T01:45:09.224Z ORB1486 151 118 953 1982-12-31T00:59:31.548Z 1982-12-31T01:24:15.065Z ORB1488 572 118 953 1983-01-02T00:44:17.506Z 1983-01-02T01:44:14.820Z ORB1489 478 118 953 1983-01-03T00:44:06.618Z 1983-01-03T01:43:57.441Z ORB1490 572 118 953 1983-01-04T00:43:51.168Z 1983-01-04T01:43:48.394Z ORB1491 299 118 953 1983-01-05T00:43:38.617Z 1983-01-05T01:38:33.455Z ORB1492 567 118 953 1983-01-06T00:43:27.018Z 1983-01-06T01:43:18.187Z ORB1493 571 118 953 1983-01-07T00:43:15.018Z 1983-01-07T01:43:05.933Z ORB1494 293 118 953 1983-01-08T00:43:03.561Z 1983-01-08T01:22:32.376Z ORB1495 315 118 953 1983-01-09T00:42:51.492Z 1983-01-09T01:42:38.518Z ORB1496 478 118 953 1983-01-10T00:42:37.927Z 1983-01-10T01:42:30.637Z ORB1497 404 118 953 1983-01-11T00:42:23.767Z 1983-01-11T01:42:18.234Z ORB1498 433 118 953 1983-01-12T00:42:15.757Z 1983-01-12T01:27:43.691Z ORB1499 524 118 953 1983-01-13T00:42:09.689Z 1983-01-13T01:41:57.875Z 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.