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 ---------------------------------------------------------------------------- ORB0500 542 118 953 1980-04-18T10:25:40.613Z 1980-04-18T11:22:29.062Z ORB0501 555 118 953 1980-04-19T10:24:17.609Z 1980-04-19T11:22:40.480Z ORB0502 571 118 953 1980-04-20T10:23:01.699Z 1980-04-20T11:22:52.551Z ORB0503 540 118 953 1980-04-21T10:21:35.535Z 1980-04-21T11:18:11.309Z ORB0504 567 118 953 1980-04-22T10:20:17.957Z 1980-04-22T11:20:08.977Z ORB0505 570 118 953 1980-04-23T10:18:41.766Z 1980-04-23T11:18:32.801Z ORB0506 559 118 953 1980-04-24T10:16:05.684Z 1980-04-24T11:15:56.715Z ORB0507 557 118 953 1980-04-25T10:13:26.105Z 1980-04-25T11:13:23.383Z ORB0508 567 118 953 1980-04-26T10:10:47.609Z 1980-04-26T11:10:44.938Z ORB0509 571 118 953 1980-04-27T10:08:10.375Z 1980-04-27T11:08:01.258Z ORB0510 303 118 953 1980-04-28T10:05:33.188Z 1980-04-28T11:03:18.215Z ORB0511 535 118 953 1980-04-29T10:02:49.152Z 1980-04-29T11:02:46.566Z ORB0512 441 118 953 1980-04-30T09:59:57.617Z 1980-04-30T10:52:02.535Z ORB0513 537 118 953 1980-05-01T09:56:08.727Z 1980-05-01T10:52:25.691Z ORB0514 549 118 953 1980-05-02T09:52:15.926Z 1980-05-02T10:52:06.953Z ORB0515 571 118 953 1980-05-03T09:48:25.176Z 1980-05-03T10:48:16.156Z ORB0516 486 118 953 1980-05-04T09:44:29.133Z 1980-05-04T10:35:24.652Z ORB0517 572 118 953 1980-05-05T09:40:31.781Z 1980-05-05T10:40:29.016Z ORB0519 571 118 953 1980-05-07T09:32:35.617Z 1980-05-07T10:32:26.648Z ORB0520 571 118 953 1980-05-08T09:27:39.984Z 1980-05-08T10:27:30.949Z ORB0521 571 118 953 1980-05-09T09:22:42.676Z 1980-05-09T10:22:33.512Z ORB0522 565 118 953 1980-05-10T09:17:46.176Z 1980-05-10T10:17:37.098Z ORB0523 523 118 953 1980-05-11T09:12:57.918Z 1980-05-11T10:11:58.445Z ORB0524 571 118 953 1980-05-12T09:07:48.418Z 1980-05-12T10:07:39.520Z ORB0525 571 118 953 1980-05-13T09:02:47.766Z 1980-05-13T10:02:38.770Z ORB0526 518 118 953 1980-05-14T08:57:33.088Z 1980-05-14T09:57:30.602Z ORB0527 570 118 953 1980-05-15T08:58:49.926Z 1980-05-15T09:58:41.109Z ORB0528 570 118 953 1980-05-16T08:59:53.223Z 1980-05-16T09:59:50.504Z ORB0529 571 118 953 1980-05-17T09:00:58.076Z 1980-05-17T10:00:49.055Z ORB0530 571 118 953 1980-05-18T09:02:00.088Z 1980-05-18T10:01:50.973Z ORB0531 570 118 953 1980-05-19T09:02:58.627Z 1980-05-19T10:02:55.906Z ORB0532 557 118 953 1980-05-20T09:03:57.025Z 1980-05-20T10:03:54.559Z ORB0533 558 118 953 1980-05-21T09:04:53.824Z 1980-05-21T10:03:22.949Z ORB0534 549 118 953 1980-05-22T09:11:13.527Z 1980-05-22T10:09:04.840Z ORB0535 530 118 953 1980-05-23T09:17:33.453Z 1980-05-23T10:17:24.383Z ORB0536 321 118 953 1980-05-24T09:23:48.844Z 1980-05-24T10:23:39.926Z ORB0537 571 118 953 1980-05-25T09:30:03.082Z 1980-05-25T10:29:54.164Z ORB0538 572 118 953 1980-05-26T09:36:16.766Z 1980-05-26T10:36:14.297Z ORB0539 563 118 953 1980-05-27T09:42:29.402Z 1980-05-27T10:41:30.023Z ORB0540 547 118 953 1980-05-28T09:48:41.781Z 1980-05-28T10:46:01.656Z ORB0541 526 118 953 1980-05-29T09:54:58.762Z 1980-05-29T10:50:37.789Z ORB0542 17 118 953 1980-05-30T10:01:06.996Z 1980-05-30T10:02:47.645Z ORB0543 572 118 953 1980-05-31T10:07:15.684Z 1980-05-31T11:07:12.859Z ORB0544 567 118 953 1980-06-01T10:13:30.816Z 1980-06-01T11:12:56.688Z ORB0545 538 118 953 1980-06-02T10:19:36.336Z 1980-06-02T11:16:12.062Z ORB0546 516 118 953 1980-06-03T10:25:47.465Z 1980-06-03T11:20:17.191Z ORB0547 572 118 953 1980-06-04T10:31:50.547Z 1980-06-04T11:31:47.875Z ORB0548 563 118 953 1980-06-05T10:37:59.680Z 1980-06-05T11:37:50.773Z ORB0549 543 118 953 1980-06-06T10:44:02.812Z 1980-06-06T11:40:57.586Z ORB0550 571 118 953 1980-06-07T10:50:10.344Z 1980-06-07T11:50:01.523Z ORB0551 572 118 953 1980-06-08T10:56:12.074Z 1980-06-08T11:56:09.453Z ORB0552 541 118 953 1980-06-09T11:02:14.949Z 1980-06-09T11:58:56.973Z ORB0553 572 118 953 1980-06-10T11:08:16.875Z 1980-06-10T12:08:14.102Z ORB0554 572 118 953 1980-06-11T11:14:21.059Z 1980-06-11T12:14:18.188Z ORB0555 569 118 953 1980-06-12T11:20:21.195Z 1980-06-12T12:20:18.520Z ORB0556 572 118 953 1980-06-13T11:26:19.562Z 1980-06-13T12:26:16.891Z ORB0557 349 118 953 1980-06-14T11:32:28.582Z 1980-06-14T12:32:15.105Z ORB0558 177 118 953 1980-06-15T11:38:23.691Z 1980-06-15T12:38:05.219Z ORB0559 246 118 953 1980-06-16T11:44:35.805Z 1980-06-16T12:43:53.828Z ORB0560 357 118 953 1980-06-17T11:50:18.414Z 1980-06-17T12:50:05.438Z ORB0561 558 118 953 1980-06-18T11:56:04.141Z 1980-06-18T12:56:01.469Z ORB0562 566 118 953 1980-06-19T12:02:02.328Z 1980-06-19T13:01:53.414Z ORB0563 562 118 953 1980-06-20T12:07:54.219Z 1980-06-20T13:07:45.230Z ORB0564 560 118 953 1980-06-21T12:13:46.152Z 1980-06-21T13:12:27.711Z ORB0565 564 118 953 1980-06-22T12:19:37.117Z 1980-06-22T13:19:28.145Z ORB0566 538 118 953 1980-06-23T12:25:29.703Z 1980-06-23T13:23:14.727Z ORB0567 532 118 953 1980-06-24T12:31:13.016Z 1980-06-24T13:27:04.613Z ORB0568 568 118 953 1980-06-25T12:37:05.227Z 1980-06-25T13:36:56.312Z ORB0569 565 118 953 1980-06-26T12:42:48.613Z 1980-06-26T13:42:39.742Z ORB0570 456 118 953 1980-06-27T12:48:26.719Z 1980-06-27T13:48:24.043Z ORB0571 567 118 953 1980-06-28T12:54:06.168Z 1980-06-28T13:54:03.547Z ORB0572 570 118 953 1980-06-29T12:59:42.703Z 1980-06-29T13:59:33.602Z ORB0573 297 118 953 1980-06-30T13:05:13.785Z 1980-06-30T13:36:18.500Z ORB0574 571 118 953 1980-07-01T13:10:41.168Z 1980-07-01T14:10:38.410Z ORB0575 570 118 953 1980-07-02T13:16:11.684Z 1980-07-02T14:16:02.691Z ORB0576 500 118 953 1980-07-03T13:21:33.137Z 1980-07-03T14:21:24.160Z ORB0577 571 118 953 1980-07-04T13:26:52.754Z 1980-07-04T14:26:43.984Z ORB0578 572 118 953 1980-07-05T13:32:01.578Z 1980-07-05T14:31:58.895Z ORB0579 571 118 953 1980-07-06T13:37:12.996Z 1980-07-06T14:37:03.965Z ORB0580 572 118 953 1980-07-07T13:42:10.082Z 1980-07-07T14:42:07.418Z ORB0581 571 118 953 1980-07-08T13:47:06.145Z 1980-07-08T14:46:57.379Z ORB0582 571 118 953 1980-07-09T13:51:47.617Z 1980-07-09T14:51:38.602Z ORB0583 552 118 953 1980-07-10T13:56:19.191Z 1980-07-10T14:56:10.246Z ORB0584 570 118 953 1980-07-11T14:00:38.590Z 1980-07-11T15:00:29.676Z ORB0585 570 118 953 1980-07-12T14:04:46.496Z 1980-07-12T15:04:43.789Z ORB0586 572 118 953 1980-07-13T14:08:44.094Z 1980-07-13T15:08:41.520Z ORB0587 504 118 953 1980-07-14T14:12:34.652Z 1980-07-14T15:12:32.105Z ORB0588 571 118 953 1980-07-15T14:16:21.000Z 1980-07-15T15:16:11.875Z ORB0589 571 118 953 1980-07-16T14:19:54.402Z 1980-07-16T15:19:45.344Z ORB0590 534 118 953 1980-07-17T14:23:18.180Z 1980-07-17T15:23:09.188Z ORB0591 572 118 953 1980-07-18T14:26:36.062Z 1980-07-18T15:26:33.387Z ORB0592 570 118 953 1980-07-19T14:29:49.613Z 1980-07-19T15:29:40.727Z ORB0593 569 118 953 1980-07-20T14:32:55.277Z 1980-07-20T15:32:52.789Z ORB0594 570 118 953 1980-07-21T14:36:02.469Z 1980-07-21T15:35:53.625Z ORB0595 570 118 953 1980-07-22T14:38:55.590Z 1980-07-22T15:38:53.031Z ORB0596 553 118 953 1980-07-23T14:41:51.781Z 1980-07-23T15:41:42.805Z ORB0597 543 118 953 1980-07-24T14:44:44.742Z 1980-07-24T15:44:35.723Z ORB0598 567 118 953 1980-07-25T14:47:36.609Z 1980-07-25T15:47:27.703Z ORB0599 568 118 953 1980-07-26T14:50:18.527Z 1980-07-26T15:50:15.801Z 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.