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 ---------------------------------------------------------------------------- ORB1201 548 118 953 1982-03-21T01:12:08.951Z 1982-03-21T02:09:35.077Z ORB1202 543 118 953 1982-03-22T01:12:12.137Z 1982-03-22T02:09:06.671Z ORB1203 523 118 953 1982-03-23T01:12:19.188Z 1982-03-23T02:08:55.015Z ORB1205 482 118 953 1982-03-25T01:12:29.621Z 1982-03-25T02:12:20.646Z ORB1207 572 118 953 1982-03-27T01:12:33.296Z 1982-03-27T02:12:30.574Z ORB1209 168 118 953 1982-03-29T01:12:36.671Z 1982-03-29T01:30:08.780Z ORB1210 564 118 953 1982-03-30T01:12:43.206Z 1982-03-30T02:12:02.632Z ORB1211 151 118 953 1982-03-31T01:27:10.928Z 1982-03-31T01:51:54.444Z ORB1212 562 118 953 1982-04-01T01:12:46.868Z 1982-04-01T02:12:37.988Z ORB1213 539 118 953 1982-04-02T01:12:43.649Z 1982-04-02T02:12:40.974Z ORB1214 571 118 953 1982-04-03T01:12:46.323Z 1982-04-03T02:12:37.353Z ORB1215 571 118 953 1982-04-04T01:12:47.800Z 1982-04-04T02:12:38.833Z ORB1216 545 118 953 1982-04-05T01:12:42.438Z 1982-04-05T02:12:39.716Z ORB1217 571 118 953 1982-04-06T01:12:44.362Z 1982-04-06T02:12:35.196Z ORB1218 152 118 953 1982-04-07T01:27:30.235Z 1982-04-07T01:51:17.512Z ORB1219 568 118 953 1982-04-08T01:12:40.976Z 1982-04-08T02:12:32.003Z ORB1220 572 118 953 1982-04-09T01:12:34.005Z 1982-04-09T02:12:31.487Z ORB1221 534 118 953 1982-04-10T01:12:33.796Z 1982-04-10T02:08:31.770Z ORB1222 572 118 953 1982-04-11T01:12:26.985Z 1982-04-11T02:12:24.262Z ORB1223 540 118 953 1982-04-12T01:12:21.174Z 1982-04-12T02:12:18.549Z ORB1224 564 118 953 1982-04-13T01:12:19.261Z 1982-04-13T02:11:57.787Z ORB1225 152 118 953 1982-04-14T01:26:51.051Z 1982-04-14T01:50:37.801Z ORB1226 539 118 953 1982-04-15T01:12:06.085Z 1982-04-15T02:09:32.209Z ORB1227 571 118 953 1982-04-16T01:12:01.582Z 1982-04-16T02:11:52.606Z ORB1228 570 118 953 1982-04-17T01:11:53.921Z 1982-04-17T02:11:44.955Z ORB1229 571 118 953 1982-04-18T01:11:41.475Z 1982-04-18T02:11:32.500Z ORB1230 571 118 953 1982-04-19T01:11:35.071Z 1982-04-19T02:11:26.147Z ORB1231 561 118 953 1982-04-20T01:11:21.726Z 1982-04-20T02:11:19.052Z ORB1232 158 118 953 1982-04-21T01:25:34.792Z 1982-04-21T01:50:27.231Z ORB1233 559 118 953 1982-04-22T01:11:04.480Z 1982-04-22T02:10:36.659Z ORB1234 560 118 953 1982-04-23T01:10:50.538Z 1982-04-23T02:10:47.767Z ORB1235 570 118 953 1982-04-24T01:10:44.703Z 1982-04-24T02:10:35.629Z ORB1236 570 118 953 1982-04-25T01:10:30.217Z 1982-04-25T02:10:21.243Z ORB1237 546 118 953 1982-04-26T01:10:14.678Z 1982-04-26T02:07:53.357Z ORB1238 556 118 953 1982-04-27T01:10:02.546Z 1982-04-27T02:09:59.825Z ORB1239 156 118 953 1982-04-28T01:24:38.561Z 1982-04-28T01:49:03.288Z ORB1240 564 118 953 1982-04-29T01:09:36.234Z 1982-04-29T02:09:33.759Z ORB1241 559 118 953 1982-04-30T01:09:22.149Z 1982-04-30T02:09:19.377Z ORB1242 571 118 953 1982-05-01T01:09:07.171Z 1982-05-01T02:08:58.198Z ORB1243 571 118 953 1982-05-02T01:08:57.394Z 1982-05-02T02:08:48.515Z ORB1244 561 118 953 1982-05-03T01:08:43.520Z 1982-05-03T02:08:34.536Z ORB1245 572 118 953 1982-05-04T01:08:23.743Z 1982-05-04T02:08:20.669Z ORB1246 154 118 953 1982-05-05T01:23:17.395Z 1982-05-05T01:47:23.397Z ORB1247 560 118 953 1982-05-06T01:07:55.595Z 1982-05-06T02:07:46.619Z ORB1248 563 118 953 1982-05-07T01:07:40.523Z 1982-05-07T02:06:40.947Z ORB1249 572 118 953 1982-05-08T01:07:21.351Z 1982-05-08T02:07:18.377Z ORB1250 571 118 953 1982-05-09T01:07:10.179Z 1982-05-09T02:07:01.103Z ORB1251 570 118 953 1982-05-10T01:06:52.509Z 1982-05-10T02:06:43.585Z ORB1252 571 118 953 1982-05-11T01:06:39.792Z 1982-05-11T02:06:31.008Z ORB1253 156 118 953 1982-05-12T01:20:38.087Z 1982-05-12T01:45:01.541Z ORB1254 522 118 953 1982-05-13T01:06:06.052Z 1982-05-13T02:01:32.476Z ORB1255 572 118 953 1982-05-14T01:05:47.967Z 1982-05-14T02:05:45.086Z ORB1256 572 118 953 1982-05-15T01:05:32.970Z 1982-05-15T02:05:30.295Z ORB1257 572 118 953 1982-05-16T01:05:18.076Z 1982-05-16T02:05:15.300Z ORB1258 501 118 953 1982-05-17T01:05:05.984Z 1982-05-17T01:59:29.405Z ORB1259 572 118 953 1982-05-18T01:04:46.296Z 1982-05-18T02:04:43.620Z ORB1260 149 118 953 1982-05-19T01:19:51.067Z 1982-05-19T01:43:09.356Z ORB1261 506 118 953 1982-05-20T01:04:17.326Z 1982-05-20T02:04:14.848Z ORB1262 572 118 953 1982-05-21T01:04:04.397Z 1982-05-21T02:04:01.768Z ORB1263 566 118 953 1982-05-22T01:03:48.420Z 1982-05-22T02:03:46.116Z ORB1264 497 118 953 1982-05-23T01:03:34.943Z 1982-05-23T01:59:07.366Z ORB1265 505 118 953 1982-05-24T01:03:27.768Z 1982-05-24T02:01:25.494Z ORB1266 494 118 953 1982-05-25T01:03:11.895Z 1982-05-25T01:57:35.619Z ORB1267 150 118 953 1982-05-26T01:18:04.177Z 1982-05-26T01:41:41.940Z ORB1268 558 118 953 1982-05-27T01:02:46.449Z 1982-05-27T02:02:43.774Z ORB1269 544 118 953 1982-05-28T01:02:32.983Z 1982-05-28T02:02:24.010Z ORB1270 570 118 953 1982-05-29T01:02:25.173Z 1982-05-29T02:02:15.798Z ORB1271 458 118 953 1982-05-30T01:02:11.810Z 1982-05-30T01:52:29.532Z ORB1272 563 118 953 1982-05-31T01:02:04.652Z 1982-05-31T02:01:55.874Z ORB1273 570 118 953 1982-06-01T01:01:52.595Z 1982-06-01T02:01:49.808Z ORB1274 158 118 953 1982-06-02T01:16:08.981Z 1982-06-02T01:40:51.686Z ORB1275 544 118 953 1982-06-03T01:01:39.885Z 1982-06-03T01:59:56.610Z ORB1276 560 118 953 1982-06-04T01:01:33.133Z 1982-06-04T02:01:24.158Z ORB1277 571 118 953 1982-06-05T01:01:22.983Z 1982-06-05T02:01:14.059Z ORB1278 521 118 953 1982-06-06T01:01:16.435Z 1982-06-06T02:01:07.461Z ORB1279 571 118 953 1982-06-07T01:01:09.885Z 1982-06-07T02:01:00.912Z ORB1280 572 118 953 1982-06-08T01:01:00.787Z 1982-06-08T02:00:58.113Z ORB1281 158 118 953 1982-06-09T01:15:23.696Z 1982-06-09T01:40:07.500Z ORB1282 532 118 953 1982-06-10T01:00:54.984Z 1982-06-10T02:00:46.209Z ORB1283 525 118 953 1982-06-11T01:00:50.133Z 1982-06-11T02:00:47.428Z ORB1285 570 118 953 1982-06-13T01:00:46.336Z 1982-06-13T02:00:37.363Z ORB1286 470 118 953 1982-06-14T01:00:40.388Z 1982-06-14T01:49:55.510Z ORB1287 570 118 953 1982-06-15T01:00:44.938Z 1982-06-15T02:00:36.064Z ORB1288 153 118 953 1982-06-16T01:15:55.235Z 1982-06-16T01:39:51.789Z ORB1290 521 118 953 1982-06-18T01:00:40.670Z 1982-06-18T02:00:37.790Z ORB1291 540 118 953 1982-06-19T01:00:45.611Z 1982-06-19T02:00:36.626Z ORB1292 375 118 953 1982-06-20T01:00:46.548Z 1982-06-20T02:00:38.025Z ORB1293 371 118 953 1982-06-21T01:00:51.678Z 1982-06-21T02:00:42.705Z ORB1294 369 118 953 1982-06-22T01:00:51.855Z 1982-06-22T02:00:42.582Z ORB1295 156 118 953 1982-06-23T01:15:38.232Z 1982-06-23T01:40:02.959Z ORB1296 363 118 953 1982-06-24T01:00:54.905Z 1982-06-24T02:00:45.333Z ORB1297 375 118 953 1982-06-25T01:00:55.205Z 1982-06-25T02:00:46.532Z ORB1298 381 118 953 1982-06-26T01:01:00.319Z 1982-06-26T02:00:51.343Z ORB1299 366 118 953 1982-06-27T01:01:02.876Z 1982-06-27T02:00:53.902Z 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.