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 ---------------------------------------------------------------------------- ORB2200 381 118 953 1984-12-13T22:21:53.422Z 1984-12-13T23:21:44.281Z ORB2201 357 118 953 1984-12-14T22:21:44.109Z 1984-12-14T23:21:34.539Z ORB2202 381 118 953 1984-12-15T22:21:43.008Z 1984-12-15T23:21:33.578Z ORB2204 381 118 953 1984-12-17T22:21:31.039Z 1984-12-17T23:21:21.758Z ORB2205 381 118 953 1984-12-18T22:21:17.352Z 1984-12-18T23:21:08.227Z ORB2206 372 118 953 1984-12-19T22:21:18.836Z 1984-12-19T23:21:00.617Z ORB2208 357 118 953 1984-12-21T22:21:15.109Z 1984-12-21T23:21:06.625Z ORB2209 381 118 953 1984-12-22T22:21:02.031Z 1984-12-22T23:20:52.781Z ORB2210 381 118 953 1984-12-23T22:20:59.078Z 1984-12-23T23:20:50.109Z ORB2211 207 118 953 1984-12-24T22:38:21.414Z 1984-12-24T23:20:00.438Z ORB2212 315 118 953 1984-12-25T22:33:28.328Z 1984-12-25T23:06:26.047Z ORB2213 303 118 953 1984-12-26T22:23:17.359Z 1984-12-26T23:20:36.594Z ORB2216 572 118 953 1984-12-29T22:20:19.938Z 1984-12-29T23:20:17.250Z ORB2217 450 118 953 1984-12-30T22:20:14.602Z 1984-12-30T23:20:09.414Z ORB2218 572 118 953 1984-12-31T22:20:04.562Z 1984-12-31T23:20:01.664Z ORB2219 572 118 953 1985-01-01T22:19:59.031Z 1985-01-01T23:19:56.320Z ORB2221 506 118 953 1985-01-03T22:23:14.336Z 1985-01-03T23:19:37.148Z ORB2222 572 118 953 1985-01-04T22:19:31.398Z 1985-01-04T23:19:28.812Z ORB2223 571 118 953 1985-01-05T22:19:26.086Z 1985-01-05T23:19:17.109Z ORB2224 571 118 953 1985-01-06T22:19:17.242Z 1985-01-06T23:19:08.078Z ORB2225 572 118 953 1985-01-07T22:19:04.141Z 1985-01-07T23:19:01.219Z ORB2226 571 118 953 1985-01-08T22:18:55.148Z 1985-01-08T23:18:46.172Z ORB2227 565 118 953 1985-01-09T22:18:41.703Z 1985-01-09T23:18:38.727Z ORB2228 571 118 953 1985-01-10T22:18:32.500Z 1985-01-10T23:18:23.430Z ORB2229 553 118 953 1985-01-11T22:18:20.828Z 1985-01-11T23:18:11.688Z ORB2231 572 118 953 1985-01-13T22:17:51.094Z 1985-01-13T23:17:48.102Z ORB2232 156 118 953 1985-01-14T22:35:41.320Z 1985-01-14T23:00:05.586Z ORB2234 148 118 953 1985-01-16T22:30:26.016Z 1985-01-16T23:02:47.031Z ORB2236 437 118 953 1985-01-18T22:29:24.383Z 1985-01-18T23:16:31.305Z ORB2237 219 118 953 1985-01-19T22:30:05.445Z 1985-01-19T23:16:04.461Z ORB2238 512 118 953 1985-01-20T22:22:11.500Z 1985-01-20T23:15:50.812Z ORB2239 271 118 953 1985-01-21T22:18:48.305Z 1985-01-21T23:15:30.328Z ORB2240 571 118 953 1985-01-22T22:15:22.820Z 1985-01-22T23:15:14.422Z ORB2241 270 118 953 1985-01-23T22:15:11.906Z 1985-01-23T23:14:49.930Z ORB2242 279 118 953 1985-01-24T22:14:46.461Z 1985-01-24T23:14:37.484Z ORB2243 521 118 953 1985-01-25T22:14:18.859Z 1985-01-25T23:14:16.523Z ORB2246 219 118 953 1985-01-28T22:13:20.688Z 1985-01-28T23:13:11.711Z ORB2247 550 118 953 1985-01-29T22:12:51.727Z 1985-01-29T23:12:49.141Z ORB2248 279 118 953 1985-01-30T22:12:38.805Z 1985-01-30T23:12:16.820Z ORB2249 233 118 953 1985-01-31T22:12:05.352Z 1985-01-31T23:11:56.375Z ORB2252 572 118 953 1985-02-03T22:10:48.875Z 1985-02-03T23:10:46.320Z ORB2254 572 118 953 1985-02-05T22:09:58.188Z 1985-02-05T23:09:55.898Z ORB2255 279 118 953 1985-02-06T22:09:32.703Z 1985-02-06T23:09:23.727Z ORB2256 155 118 953 1985-02-07T22:22:20.773Z 1985-02-07T22:54:40.781Z ORB2257 572 118 953 1985-02-08T22:08:36.609Z 1985-02-08T23:08:33.930Z ORB2258 286 118 953 1985-02-09T22:08:14.391Z 1985-02-09T23:08:05.414Z ORB2259 551 118 953 1985-02-10T22:07:46.438Z 1985-02-10T23:07:37.242Z ORB2260 286 118 953 1985-02-11T22:07:18.516Z 1985-02-11T23:07:09.539Z ORB2261 571 118 953 1985-02-12T22:06:52.336Z 1985-02-12T23:06:43.242Z ORB2263 286 118 953 1985-02-14T22:05:52.461Z 1985-02-14T23:05:43.484Z ORB2264 571 118 953 1985-02-15T22:05:29.750Z 1985-02-15T23:05:20.898Z ORB2266 571 118 953 1985-02-17T22:04:32.477Z 1985-02-17T23:04:24.094Z ORB2268 288 118 953 1985-02-19T22:23:55.141Z 1985-02-19T22:56:21.930Z ORB2269 279 118 953 1985-02-20T22:03:11.898Z 1985-02-20T23:03:02.922Z ORB2270 151 118 953 1985-02-21T22:23:23.484Z 1985-02-21T22:55:05.500Z ORB2271 511 118 953 1985-02-22T22:02:17.547Z 1985-02-22T23:02:08.570Z ORB2272 571 118 953 1985-02-23T22:01:50.703Z 1985-02-23T23:01:41.727Z ORB2275 572 118 953 1985-02-26T22:00:32.625Z 1985-02-26T23:00:29.930Z ORB2276 566 118 953 1985-02-27T22:00:07.383Z 1985-02-27T23:00:04.734Z ORB2277 572 118 953 1985-02-28T21:59:42.812Z 1985-02-28T22:59:39.883Z ORB2278 572 118 953 1985-03-01T21:59:18.578Z 1985-03-01T22:59:15.711Z ORB2279 571 118 953 1985-03-02T21:58:56.320Z 1985-03-02T22:58:47.219Z ORB2281 571 118 953 1985-03-04T21:58:12.344Z 1985-03-04T22:58:02.945Z ORB2282 571 118 953 1985-03-05T21:57:48.633Z 1985-03-05T22:57:39.258Z ORB2283 548 118 953 1985-03-06T21:58:53.078Z 1985-03-06T22:57:22.383Z ORB2285 571 118 953 1985-03-08T21:57:25.477Z 1985-03-08T22:57:16.156Z ORB2286 572 118 953 1985-03-09T21:57:26.078Z 1985-03-09T22:57:23.227Z ORB2287 536 118 953 1985-03-10T21:57:32.953Z 1985-03-10T22:57:23.945Z ORB2288 156 118 953 1985-03-11T22:18:39.703Z 1985-03-11T22:51:12.719Z ORB2289 572 118 953 1985-03-12T21:57:31.648Z 1985-03-12T22:57:28.938Z ORB2290 149 118 953 1985-03-13T22:18:22.344Z 1985-03-13T22:51:07.359Z ORB2291 484 118 953 1985-03-14T21:57:44.211Z 1985-03-14T22:57:34.734Z ORB2292 309 118 953 1985-03-15T22:19:14.805Z 1985-03-15T22:51:35.484Z ORB2293 571 118 953 1985-03-16T21:57:57.219Z 1985-03-16T22:57:47.812Z ORB2294 310 118 953 1985-03-17T22:19:25.219Z 1985-03-17T22:51:51.930Z ORB2295 154 118 953 1985-03-18T22:18:29.250Z 1985-03-18T22:50:49.266Z ORB2296 571 118 953 1985-03-19T21:58:16.125Z 1985-03-19T22:58:06.961Z ORB2297 84 118 953 1985-03-20T22:17:58.164Z 1985-03-20T22:39:12.430Z ORB2298 395 118 953 1985-03-21T21:58:31.250Z 1985-03-21T22:58:29.180Z ORB2299 314 118 953 1985-03-22T22:16:46.633Z 1985-03-22T22:49:38.641Z 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.