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 ---------------------------------------------------------------------------- ORB4200 2 118 953 1990-06-22T02:01:06.626Z 1990-07-19T02:20:27.970Z ORB4201 2 118 953 1990-06-22T02:01:15.621Z 1990-07-19T02:20:36.964Z ORB4202 2 118 953 1990-06-22T02:01:24.679Z 1990-07-19T02:20:47.456Z ORB4203 2 118 953 1990-06-22T02:01:35.171Z 1990-07-19T02:20:56.517Z ORB4204 2 118 953 1990-06-22T02:01:44.166Z 1990-07-19T02:21:05.511Z ORB4205 2 118 953 1990-06-22T02:01:53.160Z 1990-07-19T02:21:16.004Z ORB4206 2 118 953 1990-06-22T02:02:02.154Z 1990-07-19T02:21:24.997Z ORB4207 2 118 953 1990-06-22T02:02:12.646Z 1990-07-19T02:21:33.991Z ORB4208 2 118 953 1990-06-22T02:02:21.640Z 1990-07-19T02:21:42.985Z ORB4209 2 118 953 1990-06-22T02:02:30.634Z 1990-07-19T02:21:53.479Z ORB4210 2 118 953 1990-06-22T02:02:41.127Z 1990-07-19T02:22:02.473Z ORB4211 2 118 953 1990-06-22T02:02:50.121Z 1990-07-19T02:22:11.467Z ORB4212 2 118 953 1990-06-22T02:02:59.180Z 1990-07-19T02:22:21.960Z ORB4214 2 118 953 1990-06-22T02:03:09.673Z 1990-07-19T02:22:31.018Z ORB4215 1 118 953 1990-07-19T02:22:40.012Z 1990-07-19T02:22:40.012Z ORB4216 680 118 953 1990-06-22T02:03:18.667Z 1990-07-19T02:22:50.505Z ORB4217 75 118 953 1990-06-23T02:47:40.853Z 1990-07-19T02:22:59.499Z ORB4218 703 118 953 1990-06-24T01:57:38.555Z 1990-07-19T02:23:08.493Z ORB4219 693 118 953 1990-06-25T01:55:55.991Z 1990-07-19T02:23:17.486Z ORB4220 78 118 953 1990-06-26T02:46:42.183Z 1990-07-19T02:23:27.979Z ORB4221 615 118 953 1990-06-27T02:02:01.418Z 1990-07-19T02:23:36.974Z ORB4222 697 118 953 1990-06-28T02:00:19.898Z 1990-07-19T02:23:45.968Z ORB4223 73 118 953 1990-06-29T02:46:42.129Z 1990-07-19T02:23:56.461Z ORB4224 740 118 953 1990-06-30T01:53:13.579Z 1990-07-19T02:24:05.519Z ORB4225 703 118 953 1990-07-01T01:52:58.547Z 1990-07-19T02:24:14.512Z ORB4226 75 118 953 1990-07-02T02:45:38.518Z 1990-07-19T02:24:25.005Z ORB4227 736 118 953 1990-07-03T01:52:41.958Z 1990-07-19T02:24:33.999Z ORB4228 714 118 953 1990-07-03T15:31:08.582Z 1990-07-19T02:24:42.993Z ORB4229 78 118 953 1990-07-05T02:44:28.469Z 1990-07-19T02:24:51.987Z ORB4230 696 118 953 1990-07-06T01:58:18.415Z 1990-07-19T02:25:02.479Z ORB4231 242 118 953 1990-07-07T01:53:17.334Z 1990-07-19T02:25:11.474Z ORB4232 705 118 953 1990-07-08T01:52:04.863Z 1990-07-19T02:25:20.468Z ORB4233 76 118 953 1990-07-09T02:43:47.509Z 1990-07-19T02:25:30.961Z ORB4234 672 118 953 1990-07-10T01:51:31.948Z 1990-07-19T02:25:40.021Z ORB4235 744 118 953 1990-07-11T01:50:22.677Z 1990-07-19T02:25:49.014Z ORB4236 728 118 953 1990-07-12T01:50:53.406Z 1990-07-19T02:25:59.507Z ORB4237 739 118 953 1990-07-13T01:50:45.352Z 1990-07-19T02:26:08.501Z ORB4238 140 118 953 1990-07-14T01:55:32.336Z 1990-07-19T02:26:17.495Z ORB4239 716 118 953 1990-07-15T01:49:08.066Z 1990-07-19T02:26:26.489Z ORB4240 704 118 953 1990-07-16T01:55:29.043Z 1990-07-19T02:26:36.982Z ORB4241 695 118 953 1990-07-17T01:55:50.258Z 1990-07-19T02:26:45.977Z ORB4242 76 118 953 1990-07-18T02:41:24.520Z 1990-07-18T02:53:13.289Z ORB4243 501 118 953 1990-07-19T02:26:54.971Z 1990-07-19T03:47:34.029Z ORB4244 77 118 953 1990-07-20T02:40:40.220Z 1990-07-20T02:52:38.727Z ORB4245 739 118 953 1990-07-21T01:48:26.712Z 1990-07-21T03:46:54.494Z ORB4246 76 118 953 1990-07-22T02:40:12.436Z 1990-07-22T02:52:01.205Z ORB4247 738 118 953 1990-07-23T01:48:00.153Z 1990-07-23T03:46:16.691Z ORB4248 731 118 953 1990-07-24T01:48:17.129Z 1990-07-24T03:45:47.885Z ORB4250 58 118 953 1990-07-26T02:38:53.361Z 1990-07-26T02:47:51.851Z ORB4251 76 118 953 1990-07-27T02:38:32.850Z 1990-07-27T02:50:21.618Z ORB4252 736 118 953 1990-07-28T01:45:24.047Z 1990-07-28T03:44:27.805Z ORB4253 737 118 953 1990-07-29T01:45:10.287Z 1990-07-29T03:44:14.793Z ORB4254 639 118 953 1990-07-30T01:45:35.262Z 1990-07-30T03:43:51.799Z ORB4255 386 118 953 1990-07-31T02:24:33.243Z 1990-07-31T03:28:31.009Z ORB4256 650 118 953 1990-08-01T01:43:31.427Z 1990-08-01T03:28:05.932Z ORB4258 551 118 953 1990-08-03T01:44:26.853Z 1990-08-03T03:42:07.393Z ORB4259 557 118 953 1990-08-04T01:46:19.838Z 1990-08-04T03:41:41.875Z ORB4260 564 118 953 1990-08-05T01:43:34.308Z 1990-08-05T03:41:14.847Z ORB4261 1 118 953 1990-09-27T01:16:06.905Z 1990-09-27T01:16:06.905Z ORB4262 1 118 953 1990-09-27T01:16:20.905Z 1990-09-27T01:16:20.905Z ORB4263 1 118 953 1990-09-27T01:16:32.905Z 1990-09-27T01:16:32.905Z ORB4264 1 118 953 1990-09-27T01:16:44.905Z 1990-09-27T01:16:44.905Z ORB4265 1 118 953 1990-09-27T01:16:58.905Z 1990-09-27T01:16:58.905Z ORB4266 1 118 953 1990-09-27T01:17:10.905Z 1990-09-27T01:17:10.905Z ORB4267 1 118 953 1990-09-27T01:17:22.905Z 1990-09-27T01:17:22.905Z ORB4268 1 118 953 1990-09-27T01:17:34.905Z 1990-09-27T01:17:34.905Z ORB4269 1 118 953 1990-09-27T01:17:48.905Z 1990-09-27T01:17:48.905Z ORB4270 1 118 953 1990-09-27T01:18:00.905Z 1990-09-27T01:18:00.905Z ORB4271 1 118 953 1990-09-27T01:18:12.905Z 1990-09-27T01:18:12.905Z ORB4272 1 118 953 1990-09-27T01:18:26.905Z 1990-09-27T01:18:26.905Z ORB4273 1 118 953 1990-09-27T01:18:38.905Z 1990-09-27T01:18:38.905Z ORB4274 1 118 953 1990-09-27T01:18:50.905Z 1990-09-27T01:18:50.905Z ORB4275 1 118 953 1990-09-27T01:19:04.905Z 1990-09-27T01:19:04.905Z ORB4276 1 118 953 1990-09-27T01:19:16.905Z 1990-09-27T01:19:16.905Z ORB4277 1 118 953 1990-09-27T01:19:28.905Z 1990-09-27T01:19:28.905Z ORB4278 1 118 953 1990-09-27T01:19:40.905Z 1990-09-27T01:19:40.905Z ORB4279 1 118 953 1990-09-27T01:19:54.905Z 1990-09-27T01:19:54.905Z ORB4280 1 118 953 1990-09-27T01:20:06.906Z 1990-09-27T01:20:06.906Z ORB4281 1 118 953 1990-09-27T01:20:18.906Z 1990-09-27T01:20:18.906Z ORB4282 1 118 953 1990-09-27T01:20:32.906Z 1990-09-27T01:20:32.906Z ORB4283 1 118 953 1990-09-27T01:20:44.906Z 1990-09-27T01:20:44.906Z ORB4284 1 118 953 1990-09-27T01:20:56.906Z 1990-09-27T01:20:56.906Z ORB4285 1 118 953 1990-09-27T01:21:10.906Z 1990-09-27T01:21:10.906Z ORB4286 1 118 953 1990-09-27T01:21:22.906Z 1990-09-27T01:21:22.906Z ORB4287 1 118 953 1990-09-27T01:21:34.906Z 1990-09-27T01:21:34.906Z ORB4288 1 118 953 1990-09-27T01:21:46.906Z 1990-09-27T01:21:46.906Z ORB4289 1 118 953 1990-09-27T01:22:00.906Z 1990-09-27T01:22:00.906Z ORB4290 1 118 953 1990-09-27T01:22:12.907Z 1990-09-27T01:22:12.907Z ORB4291 1 118 953 1990-09-27T01:22:24.907Z 1990-09-27T01:22:24.907Z ORB4292 1 118 953 1990-09-27T01:22:38.907Z 1990-09-27T01:22:38.907Z ORB4293 1 118 953 1990-09-27T01:22:50.907Z 1990-09-27T01:22:50.907Z ORB4294 1 118 953 1990-09-27T01:23:02.907Z 1990-09-27T01:23:02.907Z ORB4295 1 118 953 1990-09-27T01:23:16.907Z 1990-09-27T01:23:16.907Z ORB4296 1 118 953 1990-09-27T01:23:28.907Z 1990-09-27T01:23:28.907Z ORB4297 1 118 953 1990-09-27T01:23:40.907Z 1990-09-27T01:23:40.907Z ORB4298 1 118 953 1990-09-27T01:23:52.907Z 1990-09-27T01:23:52.907Z ORB4299 1 118 953 1990-09-27T01:24:06.907Z 1990-09-27T01:24:06.907Z 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.