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 ---------------------------------------------------------------------------- ORB1300 368 118 953 1982-06-28T01:01:13.386Z 1982-06-28T02:01:04.261Z ORB1301 313 118 953 1982-06-29T01:01:18.345Z 1982-06-29T02:01:08.920Z ORB1302 156 118 953 1982-06-30T01:15:47.748Z 1982-06-30T01:40:31.265Z ORB1303 360 118 953 1982-07-01T01:01:25.316Z 1982-07-01T02:01:15.892Z ORB1304 373 118 953 1982-07-02T01:01:28.958Z 1982-07-02T02:01:19.983Z ORB1305 379 118 953 1982-07-03T01:01:33.476Z 1982-07-03T02:01:05.451Z ORB1306 357 118 953 1982-07-04T01:01:39.469Z 1982-07-04T01:58:40.541Z ORB1307 371 118 953 1982-07-05T01:01:47.073Z 1982-07-05T02:00:41.094Z ORB1308 346 118 953 1982-07-06T01:01:58.121Z 1982-07-06T01:56:55.891Z ORB1309 154 118 953 1982-07-07T01:16:17.770Z 1982-07-07T01:40:23.771Z ORB1310 358 118 953 1982-07-08T01:02:10.069Z 1982-07-08T01:59:29.741Z ORB1313 380 118 953 1982-07-11T01:02:23.729Z 1982-07-11T02:02:14.455Z ORB1314 380 118 953 1982-07-12T01:02:31.846Z 1982-07-12T02:02:22.572Z ORB1315 378 118 953 1982-07-13T01:02:36.362Z 1982-07-13T02:02:26.939Z ORB1316 156 118 953 1982-07-14T01:17:07.817Z 1982-07-14T01:41:51.334Z ORB1317 372 118 953 1982-07-15T01:02:42.943Z 1982-07-15T02:02:33.968Z ORB1318 380 118 953 1982-07-16T01:02:53.558Z 1982-07-16T02:02:44.885Z ORB1319 378 118 953 1982-07-17T01:02:52.674Z 1982-07-17T02:02:43.399Z ORB1320 381 118 953 1982-07-18T01:02:57.339Z 1982-07-18T02:02:48.064Z ORB1322 345 118 953 1982-07-20T01:04:35.017Z 1982-07-20T02:03:01.292Z ORB1323 158 118 953 1982-07-21T01:17:34.121Z 1982-07-21T01:42:17.637Z ORB1324 351 118 953 1982-07-22T01:03:16.138Z 1982-07-22T02:03:07.013Z ORB1325 378 118 953 1982-07-23T01:03:16.595Z 1982-07-23T02:03:07.620Z ORB1326 240 118 953 1982-07-24T01:22:17.905Z 1982-07-24T02:00:05.920Z ORB1327 158 118 953 1982-07-25T01:17:40.999Z 1982-07-25T01:42:24.914Z ORB1328 381 118 953 1982-07-26T01:03:24.354Z 1982-07-26T02:03:15.230Z ORB1329 381 118 953 1982-07-27T01:03:19.203Z 1982-07-27T02:03:10.078Z ORB1330 159 118 953 1982-07-28T01:17:39.289Z 1982-07-28T01:42:32.255Z ORB1331 369 118 953 1982-07-29T01:03:22.647Z 1982-07-29T02:01:57.921Z ORB1332 381 118 953 1982-07-30T01:03:16.186Z 1982-07-30T02:03:07.212Z ORB1333 381 118 953 1982-07-31T01:03:14.831Z 1982-07-31T02:03:05.856Z ORB1334 373 118 953 1982-08-01T01:03:12.423Z 1982-08-01T02:03:03.598Z ORB1335 381 118 953 1982-08-02T01:03:13.764Z 1982-08-02T02:03:04.489Z ORB1336 373 118 953 1982-08-03T01:03:03.850Z 1982-08-03T02:02:55.176Z ORB1337 141 118 953 1982-08-04T01:17:38.925Z 1982-08-04T01:42:12.704Z ORB1338 374 118 953 1982-08-05T01:02:54.676Z 1982-08-05T02:02:45.702Z ORB1339 368 118 953 1982-08-06T01:02:54.597Z 1982-08-06T02:02:45.623Z ORB1340 381 118 953 1982-08-07T01:02:46.933Z 1982-08-07T02:02:37.957Z ORB1341 381 118 953 1982-08-08T01:02:40.919Z 1982-08-08T02:02:31.944Z ORB1342 381 118 953 1982-08-09T01:02:30.554Z 1982-08-09T02:02:21.879Z ORB1343 380 118 953 1982-08-10T01:02:24.694Z 1982-08-10T02:02:15.569Z ORB1345 375 118 953 1982-08-12T01:02:04.131Z 1982-08-12T02:01:54.856Z ORB1346 374 118 953 1982-08-13T01:01:54.841Z 1982-08-13T02:01:46.167Z ORB1347 380 118 953 1982-08-14T01:01:47.034Z 1982-08-14T02:01:38.059Z ORB1348 379 118 953 1982-08-15T01:01:30.077Z 1982-08-15T02:01:21.102Z ORB1349 380 118 953 1982-08-16T01:01:23.915Z 1982-08-16T02:01:15.391Z ORB1350 285 118 953 1982-08-17T01:01:06.302Z 1982-08-17T02:00:57.328Z ORB1351 148 118 953 1982-08-18T01:15:53.875Z 1982-08-18T01:39:12.625Z ORB1352 358 118 953 1982-08-19T01:00:41.979Z 1982-08-19T02:00:33.003Z ORB1353 318 118 953 1982-08-20T01:00:35.319Z 1982-08-20T02:00:23.343Z ORB1354 331 118 953 1982-08-21T01:00:16.908Z 1982-08-21T02:00:07.932Z ORB1355 381 118 953 1982-08-22T00:59:57.998Z 1982-08-22T01:59:48.423Z ORB1356 482 118 953 1982-08-23T00:59:43.738Z 1982-08-23T01:59:39.261Z ORB1357 316 118 953 1982-08-24T01:00:42.431Z 1982-08-24T01:59:27.453Z ORB1358 158 118 953 1982-08-25T01:13:40.221Z 1982-08-25T01:38:23.737Z ORB1359 371 118 953 1982-08-26T00:59:02.013Z 1982-08-26T01:58:53.336Z ORB1360 375 118 953 1982-08-27T00:58:47.450Z 1982-08-27T01:58:38.924Z ORB1361 382 118 953 1982-08-28T00:58:30.543Z 1982-08-28T01:58:21.568Z ORB1362 381 118 953 1982-08-29T00:58:15.638Z 1982-08-29T01:58:07.263Z ORB1363 381 118 953 1982-08-30T00:57:59.733Z 1982-08-30T01:57:50.760Z ORB1364 316 118 953 1982-08-31T00:57:47.327Z 1982-08-31T01:57:34.353Z ORB1365 155 118 953 1982-09-01T01:12:10.917Z 1982-09-01T01:36:35.645Z ORB1366 374 118 953 1982-09-02T00:57:15.717Z 1982-09-02T01:56:57.443Z ORB1367 322 118 953 1982-09-03T00:56:55.357Z 1982-09-03T01:56:43.632Z ORB1368 479 118 953 1982-09-04T00:56:37.007Z 1982-09-04T01:56:34.628Z ORB1369 318 118 953 1982-09-05T00:56:23.804Z 1982-09-05T01:56:10.829Z ORB1370 474 118 953 1982-09-06T00:56:04.702Z 1982-09-06T01:56:00.111Z ORB1372 154 118 953 1982-09-08T01:10:30.592Z 1982-09-08T01:34:45.758Z ORB1373 302 118 953 1982-09-09T00:55:22.443Z 1982-09-09T01:54:44.718Z ORB1374 371 118 953 1982-09-10T00:55:10.550Z 1982-09-10T01:54:43.276Z ORB1375 451 118 953 1982-09-11T00:54:55.408Z 1982-09-11T01:50:23.181Z ORB1376 381 118 953 1982-09-12T00:54:39.752Z 1982-09-12T01:54:30.777Z ORB1377 472 118 953 1982-09-13T00:54:21.595Z 1982-09-13T01:53:24.871Z ORB1378 312 118 953 1982-09-14T00:54:08.451Z 1982-09-14T01:53:54.476Z ORB1379 157 118 953 1982-09-15T01:08:35.518Z 1982-09-15T01:33:09.519Z ORB1380 307 118 953 1982-09-16T00:53:49.399Z 1982-09-16T01:53:10.424Z ORB1381 378 118 953 1982-09-17T00:53:33.749Z 1982-09-17T01:52:56.274Z ORB1382 377 118 953 1982-09-18T00:53:23.353Z 1982-09-18T01:52:55.627Z ORB1383 378 118 953 1982-09-19T00:53:08.709Z 1982-09-19T01:52:31.234Z ORB1384 380 118 953 1982-09-20T00:53:01.064Z 1982-09-20T01:52:42.338Z ORB1385 239 118 953 1982-09-21T00:52:48.919Z 1982-09-21T01:39:18.941Z ORB1386 152 118 953 1982-09-22T01:07:00.768Z 1982-09-22T01:31:45.034Z ORB1387 294 118 953 1982-09-23T00:52:32.382Z 1982-09-23T01:51:51.656Z ORB1388 299 118 953 1982-09-24T00:52:33.222Z 1982-09-24T01:51:51.247Z ORB1389 379 118 953 1982-09-25T00:52:20.326Z 1982-09-25T01:51:52.602Z ORB1390 377 118 953 1982-09-26T00:52:11.711Z 1982-09-26T01:51:33.937Z ORB1391 378 118 953 1982-09-27T00:52:05.916Z 1982-09-27T01:51:29.042Z ORB1392 304 118 953 1982-09-28T00:51:57.870Z 1982-09-28T01:51:16.144Z ORB1394 299 118 953 1982-09-30T00:51:47.592Z 1982-09-30T01:51:15.617Z ORB1395 308 118 953 1982-10-01T00:51:43.195Z 1982-10-01T01:51:06.220Z ORB1396 479 118 953 1982-10-02T00:53:40.812Z 1982-10-02T01:50:49.836Z ORB1397 339 118 953 1982-10-03T00:51:40.921Z 1982-10-03T01:50:43.947Z ORB1398 435 118 953 1982-10-04T00:51:33.678Z 1982-10-04T01:51:22.803Z ORB1399 341 118 953 1982-10-05T00:51:37.877Z 1982-10-05T01:51:24.153Z 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.