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 ---------------------------------------------------------------------------- ORB0200 518 118 953 1979-06-22T21:41:34.422Z 1979-06-22T22:36:22.898Z ORB0202 449 118 953 1979-06-24T21:40:10.281Z 1979-06-24T22:27:44.234Z ORB0204 569 118 953 1979-06-26T21:42:24.453Z 1979-06-26T22:42:21.750Z ORB0205 424 118 953 1979-06-27T21:43:23.305Z 1979-06-27T22:30:50.828Z ORB0206 568 118 953 1979-06-28T21:44:11.539Z 1979-06-28T22:44:02.422Z ORB0207 557 118 953 1979-06-29T21:44:49.477Z 1979-06-29T22:44:40.469Z ORB0208 517 118 953 1979-06-30T21:50:36.227Z 1979-06-30T22:45:18.484Z ORB0209 565 118 953 1979-07-01T21:45:45.367Z 1979-07-01T22:45:42.562Z ORB0210 197 118 953 1979-07-02T21:46:53.758Z 1979-07-02T22:33:49.781Z ORB0211 431 118 953 1979-07-03T21:46:27.359Z 1979-07-03T22:31:36.492Z ORB0212 561 118 953 1979-07-04T21:46:36.305Z 1979-07-04T22:46:27.453Z ORB0213 451 118 953 1979-07-05T21:47:05.156Z 1979-07-05T22:34:20.148Z ORB0214 572 118 953 1979-07-06T21:46:45.289Z 1979-07-06T22:46:41.852Z ORB0215 564 118 953 1979-07-07T21:46:41.133Z 1979-07-07T22:46:00.945Z ORB0216 571 118 953 1979-07-08T21:46:32.547Z 1979-07-08T22:46:23.250Z ORB0217 77 118 953 1979-07-09T22:05:48.180Z 1979-07-09T22:45:52.695Z ORB0218 229 118 953 1979-07-10T21:46:15.297Z 1979-07-10T22:45:32.820Z ORB0219 409 118 953 1979-07-11T21:59:38.930Z 1979-07-11T22:45:32.039Z ORB0220 571 118 953 1979-07-12T21:45:16.508Z 1979-07-12T22:45:07.438Z ORB0221 454 118 953 1979-07-13T21:44:42.180Z 1979-07-13T22:32:15.664Z ORB0222 429 118 953 1979-07-14T21:44:08.312Z 1979-07-14T22:43:53.883Z ORB0223 571 118 953 1979-07-15T21:43:19.336Z 1979-07-15T22:43:10.469Z ORB0224 572 118 953 1979-07-16T21:42:24.875Z 1979-07-16T22:42:21.633Z ORB0225 309 118 953 1979-07-17T21:58:27.023Z 1979-07-17T22:41:26.289Z ORB0226 471 118 953 1979-07-18T21:40:54.367Z 1979-07-18T22:40:25.078Z ORB0227 564 118 953 1979-07-19T21:39:26.617Z 1979-07-19T22:39:17.836Z ORB0228 532 118 953 1979-07-20T21:38:06.844Z 1979-07-20T22:33:58.188Z ORB0229 453 118 953 1979-07-21T21:37:03.812Z 1979-07-21T22:24:31.203Z ORB0230 572 118 953 1979-07-22T21:35:17.258Z 1979-07-22T22:35:14.344Z ORB0231 568 118 953 1979-07-23T21:33:46.609Z 1979-07-23T22:33:37.555Z ORB0232 570 118 953 1979-07-24T21:32:03.281Z 1979-07-24T22:31:54.148Z ORB0233 467 118 953 1979-07-25T21:34:12.406Z 1979-07-25T22:34:06.219Z ORB0234 431 118 953 1979-07-26T21:36:17.961Z 1979-07-26T22:36:15.602Z ORB0235 173 118 953 1979-07-27T22:20:12.547Z 1979-07-27T22:38:16.242Z ORB0236 571 118 953 1979-07-28T21:40:13.859Z 1979-07-28T22:40:04.250Z ORB0237 451 118 953 1979-07-29T21:42:24.047Z 1979-07-29T22:29:39.383Z ORB0238 555 118 953 1979-07-30T21:43:32.750Z 1979-07-30T22:43:23.609Z ORB0239 571 118 953 1979-07-31T21:45:00.656Z 1979-07-31T22:44:51.648Z ORB0240 529 118 953 1979-08-01T21:50:43.016Z 1979-08-01T22:46:15.609Z ORB0241 442 118 953 1979-08-02T21:47:37.172Z 1979-08-02T22:47:30.703Z ORB0242 566 118 953 1979-08-03T21:48:46.328Z 1979-08-03T22:48:37.016Z ORB0243 570 118 953 1979-08-04T21:49:49.570Z 1979-08-04T22:49:40.516Z ORB0244 570 118 953 1979-08-05T21:50:53.531Z 1979-08-05T22:50:38.180Z ORB0245 471 118 953 1979-08-06T21:52:04.820Z 1979-08-06T22:51:35.344Z ORB0246 468 118 953 1979-08-07T21:53:03.477Z 1979-08-07T22:52:35.695Z ORB0247 526 118 953 1979-08-08T21:53:38.227Z 1979-08-08T22:51:29.656Z ORB0248 489 118 953 1979-08-09T22:00:36.789Z 1979-08-09T22:54:15.883Z ORB0251 311 118 953 1979-08-12T21:57:06.242Z 1979-08-12T22:56:44.766Z ORB0283 73 118 953 1979-09-13T22:19:27.773Z 1979-09-13T22:46:03.789Z ORB0285 172 118 953 1979-09-15T22:19:16.070Z 1979-09-15T23:15:28.094Z ORB0287 166 118 953 1979-09-17T22:37:30.375Z 1979-09-17T23:23:10.891Z ORB0288 111 118 953 1979-09-18T22:48:03.523Z 1979-09-18T23:47:52.039Z ORB0289 169 118 953 1979-09-19T22:58:48.672Z 1979-09-19T23:58:22.695Z ORB0290 221 118 953 1979-09-20T23:08:01.328Z 1979-09-21T00:06:46.348Z ORB0291 216 118 953 1979-09-21T23:17:26.977Z 1979-09-22T00:16:05.494Z ORB0292 184 118 953 1979-09-22T23:26:44.109Z 1979-09-23T00:24:32.640Z ORB0293 139 118 953 1979-09-23T23:35:49.258Z 1979-09-24T00:29:06.284Z ORB0294 210 118 953 1979-09-24T23:45:14.406Z 1979-09-25T00:43:57.433Z ORB0295 154 118 953 1979-09-25T23:54:32.047Z 1979-09-26T00:52:27.076Z 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.