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 ---------------------------------------------------------------------------- ORB4401 286 118 953 1990-12-24T00:50:15.101Z 1990-12-24T02:32:17.133Z ORB4403 203 118 953 1990-12-26T01:27:44.494Z 1990-12-26T02:46:27.768Z ORB4404 570 118 953 1990-12-27T00:47:58.178Z 1990-12-27T02:46:16.216Z ORB4405 74 118 953 1990-12-28T01:39:34.633Z 1990-12-28T01:51:14.350Z ORB4406 499 118 953 1990-12-29T00:47:31.090Z 1990-12-29T02:30:24.372Z ORB4407 569 118 953 1990-12-30T00:46:26.774Z 1990-12-30T02:44:46.062Z ORB4408 321 118 953 1990-12-31T00:45:56.489Z 1990-12-31T02:44:22.526Z ORB4409 1 118 953 1991-01-02T01:30:28.410Z 1991-01-02T01:30:28.410Z ORB4410 697 118 953 1991-01-02T01:30:34.410Z 1991-01-02T02:43:51.935Z ORB4411 521 118 953 1991-01-03T00:45:34.872Z 1991-01-03T02:43:16.159Z ORB4412 1037 118 953 1991-01-04T00:46:25.078Z 1991-01-04T02:43:04.615Z ORB4413 569 118 953 1991-01-05T00:44:21.985Z 1991-01-05T02:42:27.271Z ORB4414 140 118 953 1991-01-06T00:42:47.669Z 1991-01-06T00:57:23.173Z ORB4415 322 118 953 1991-01-07T00:44:27.640Z 1991-01-07T02:41:40.928Z ORB4416 1040 118 953 1991-01-08T00:48:04.357Z 1991-01-08T02:41:40.895Z ORB4417 1119 118 953 1991-01-09T00:43:53.292Z 1991-01-09T02:41:22.833Z ORB4418 568 118 953 1991-01-10T00:42:43.254Z 1991-01-10T02:40:55.290Z ORB4419 201 118 953 1991-01-11T00:41:25.716Z 1991-01-11T01:45:53.973Z ORB4420 188 118 953 1991-01-12T00:41:52.619Z 1991-01-12T01:45:33.344Z ORB4421 1099 118 953 1991-01-13T00:40:40.587Z 1991-01-13T02:40:03.628Z ORB4422 407 118 953 1991-01-14T00:40:41.508Z 1991-01-14T02:39:10.036Z ORB4423 1098 118 953 1991-01-15T00:39:52.929Z 1991-01-15T02:39:28.469Z ORB4424 233 118 953 1991-01-16T00:40:25.350Z 1991-01-16T01:44:32.136Z ORB4425 868 118 953 1991-01-17T00:40:20.022Z 1991-01-17T02:38:47.052Z ORB4426 1139 118 953 1991-01-18T00:39:10.928Z 1991-01-18T02:38:39.969Z ORB4428 430 118 953 1991-01-20T00:42:10.830Z 1991-01-20T01:52:34.098Z ORB4429 605 118 953 1991-01-21T00:38:14.540Z 1991-01-21T01:44:11.062Z ORB4430 1136 118 953 1991-01-22T00:38:32.459Z 1991-01-22T02:37:43.001Z ORB4431 1134 118 953 1991-01-23T00:38:32.440Z 1991-01-23T02:37:29.980Z ORB4432 792 118 953 1991-01-24T00:38:24.915Z 1991-01-24T02:37:09.185Z ORB4433 1132 118 953 1991-01-25T00:38:15.084Z 1991-01-25T02:37:06.625Z ORB4434 818 118 953 1991-01-26T00:39:12.561Z 1991-01-26T02:37:02.052Z ORB4435 1062 118 953 1991-01-27T00:37:29.262Z 1991-01-27T02:36:52.304Z ORB4436 425 118 953 1991-01-28T00:37:56.215Z 1991-01-28T02:36:25.494Z ORB4437 1079 118 953 1991-01-29T00:38:16.163Z 1991-01-29T02:31:33.954Z ORB4438 1015 118 953 1991-01-30T00:40:00.361Z 1991-01-30T02:26:28.648Z ORB4439 1112 118 953 1991-01-31T00:38:17.337Z 1991-01-31T02:36:18.627Z ORB4440 1117 118 953 1991-02-01T00:38:16.813Z 1991-02-01T02:36:11.854Z ORB4441 1111 118 953 1991-02-02T00:38:10.795Z 1991-02-02T02:34:50.086Z ORB4442 1061 118 953 1991-02-03T00:36:49.029Z 1991-02-03T02:35:59.570Z ORB4443 245 118 953 1991-02-04T00:55:38.253Z 1991-02-04T02:01:37.500Z ORB4444 760 118 953 1991-02-05T00:37:52.741Z 1991-02-05T01:57:47.019Z ORB4445 719 118 953 1991-02-06T00:39:21.911Z 1991-02-06T02:04:50.190Z ORB4446 899 118 953 1991-02-07T00:38:18.644Z 1991-02-07T02:12:35.926Z ORB4447 78 118 953 1991-02-08T01:28:27.121Z 1991-02-08T01:40:34.614Z ORB4448 889 118 953 1991-02-09T00:38:16.316Z 1991-02-09T02:12:21.099Z ORB4449 1081 118 953 1991-02-10T00:38:18.303Z 1991-02-10T02:35:22.845Z ORB4450 845 118 953 1991-02-11T00:38:13.792Z 1991-02-11T02:12:18.576Z ORB4451 1055 118 953 1991-02-12T00:36:15.995Z 1991-02-12T02:27:15.284Z ORB4452 758 118 953 1991-02-13T00:36:31.725Z 1991-02-13T01:56:07.253Z ORB4453 1033 118 953 1991-02-14T00:37:30.210Z 1991-02-14T02:26:04.494Z ORB4455 1051 118 953 1991-02-16T00:47:27.751Z 1991-02-16T02:25:57.281Z ORB4456 440 118 953 1991-02-17T00:36:52.340Z 1991-02-17T01:22:58.105Z ORB4457 1054 118 953 1991-02-18T00:36:03.738Z 1991-02-18T02:34:49.027Z ORB4458 1130 118 953 1991-02-19T00:36:12.476Z 1991-02-19T02:34:45.267Z ORB4459 1132 118 953 1991-02-20T00:35:42.895Z 1991-02-20T02:34:40.938Z ORB4460 1127 118 953 1991-02-21T00:35:25.138Z 1991-02-21T02:34:35.682Z ORB4461 1131 118 953 1991-02-22T00:35:26.879Z 1991-02-22T02:34:31.172Z ORB4462 1127 118 953 1991-02-23T00:36:03.126Z 1991-02-23T02:34:23.168Z ORB4463 404 118 953 1991-02-24T00:35:13.502Z 1991-02-24T01:17:51.516Z ORB4464 953 118 953 1991-02-25T00:35:57.755Z 1991-02-25T02:19:54.793Z ORB4465 1132 118 953 1991-02-26T00:35:19.758Z 1991-02-26T02:34:05.052Z ORB4466 112 118 953 1991-02-27T00:35:05.756Z 1991-02-27T00:46:45.010Z ORB4467 1121 118 953 1991-02-28T00:34:47.000Z 1991-02-28T02:33:51.292Z ORB4468 1134 118 953 1991-03-01T00:34:37.493Z 1991-03-01T02:33:41.785Z ORB4469 1131 118 953 1991-03-02T00:34:58.735Z 1991-03-02T02:33:44.027Z ORB4470 1125 118 953 1991-03-03T00:34:34.479Z 1991-03-03T02:33:38.522Z ORB4471 1134 118 953 1991-03-04T00:34:33.474Z 1991-03-04T02:33:31.267Z ORB4472 464 118 953 1991-03-05T00:34:12.687Z 1991-03-05T01:22:55.953Z ORB4473 1126 118 953 1991-03-06T00:34:23.644Z 1991-03-06T02:33:15.187Z ORB4474 1130 118 953 1991-03-07T00:34:13.878Z 1991-03-07T02:33:05.670Z ORB4475 1129 118 953 1991-03-08T00:34:10.615Z 1991-03-08T02:32:55.907Z ORB4476 300 118 953 1991-03-09T02:01:12.884Z 1991-03-09T02:32:42.896Z ORB4477 1178 118 953 1991-03-10T00:44:14.347Z 1991-03-10T02:32:36.135Z ORB4478 1127 118 953 1991-03-11T00:33:31.333Z 1991-03-11T02:32:22.876Z ORB4479 948 118 953 1991-03-12T00:33:25.077Z 1991-03-12T02:32:12.117Z ORB4480 1026 118 953 1991-03-13T00:43:36.792Z 1991-03-13T02:31:52.082Z ORB4481 821 118 953 1991-03-14T00:32:59.264Z 1991-03-14T02:06:21.296Z ORB4482 513 118 953 1991-03-15T00:32:23.751Z 1991-03-15T02:31:19.791Z ORB4483 1076 118 953 1991-03-16T00:32:12.223Z 1991-03-16T02:31:05.264Z ORB4484 1073 118 953 1991-03-17T00:32:16.176Z 1991-03-17T02:31:03.218Z ORB4485 576 118 953 1991-03-18T00:32:03.160Z 1991-03-18T02:31:12.201Z ORB4486 906 118 953 1991-03-19T00:31:49.633Z 1991-03-19T02:30:26.925Z ORB4488 1060 118 953 1991-03-21T00:38:37.324Z 1991-03-21T02:29:55.364Z ORB4489 572 118 953 1991-03-22T00:30:15.774Z 1991-03-22T02:29:30.815Z ORB4490 1077 118 953 1991-03-23T00:29:48.224Z 1991-03-23T02:29:15.264Z ORB4491 967 118 953 1991-03-24T00:41:40.180Z 1991-03-24T02:28:58.968Z ORB4492 1048 118 953 1991-03-25T00:38:17.662Z 1991-03-25T02:28:38.951Z ORB4493 1032 118 953 1991-03-26T00:38:16.395Z 1991-03-26T02:28:18.934Z ORB4494 529 118 953 1991-03-27T00:38:29.349Z 1991-03-27T02:27:46.387Z ORB4495 527 118 953 1991-03-28T00:38:20.797Z 1991-03-28T02:27:24.833Z ORB4496 510 118 953 1991-03-29T00:28:32.712Z 1991-03-29T02:27:09.752Z ORB4497 526 118 953 1991-03-30T00:38:27.197Z 1991-03-30T02:26:34.233Z ORB4498 1069 118 953 1991-03-31T00:26:57.114Z 1991-03-31T02:26:28.405Z ORB4499 573 118 953 1991-04-01T00:27:24.101Z 1991-04-01T02:25:55.140Z 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.