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 ---------------------------------------------------------------------------- ORB2100 2 118 953 1984-09-04T23:15:54.375Z "UNK" ORB2101 153 118 953 1984-09-05T23:16:51.945Z 1984-09-05T23:48:46.953Z ORB2102 209 118 953 1984-09-06T23:00:11.469Z 1984-09-07T00:00:06.000Z ORB2103 299 118 953 1984-09-07T22:59:54.562Z 1984-09-07T23:59:43.031Z ORB2104 202 118 953 1984-09-08T22:59:48.109Z 1984-09-08T23:59:11.078Z ORB2105 498 118 953 1984-09-09T22:59:32.578Z 1984-09-09T23:59:04.000Z ORB2106 181 118 953 1984-09-10T22:59:21.727Z 1984-09-10T23:58:57.711Z ORB2107 298 118 953 1984-09-11T23:13:25.102Z 1984-09-11T23:45:51.406Z ORB2108 80 118 953 1984-09-12T22:58:44.297Z 1984-09-12T23:58:35.359Z ORB2109 199 118 953 1984-09-13T22:58:39.398Z 1984-09-13T23:45:13.930Z ORB2110 475 118 953 1984-09-14T22:58:11.891Z 1984-09-14T23:58:06.406Z ORB2111 153 118 953 1984-09-15T23:11:41.016Z 1984-09-15T23:44:15.023Z ORB2112 466 118 953 1984-09-16T22:57:40.023Z 1984-09-16T23:57:19.039Z ORB2113 201 118 953 1984-09-17T22:57:30.547Z 1984-09-17T23:45:39.602Z ORB2114 186 118 953 1984-09-18T22:57:09.570Z 1984-09-18T23:57:01.477Z ORB2116 194 118 953 1984-09-20T22:56:41.195Z 1984-09-20T23:55:55.172Z ORB2117 190 118 953 1984-09-21T22:56:09.234Z 1984-09-21T23:27:02.211Z ORB2118 153 118 953 1984-09-22T23:13:30.516Z 1984-09-22T23:37:27.055Z ORB2119 112 118 953 1984-09-23T22:55:25.750Z 1984-09-23T23:13:14.109Z ORB2120 89 118 953 1984-09-24T22:55:16.875Z 1984-09-24T23:54:48.375Z ORB2121 153 118 953 1984-09-25T23:12:05.922Z 1984-09-25T23:36:21.367Z ORB2122 246 118 953 1984-09-26T22:54:24.203Z 1984-09-26T23:53:50.484Z ORB2123 237 118 953 1984-09-27T22:54:09.047Z 1984-09-27T23:53:42.070Z ORB2124 341 118 953 1984-09-28T22:53:33.461Z 1984-09-28T23:53:25.344Z ORB2125 213 118 953 1984-09-29T22:53:24.391Z 1984-09-29T23:52:56.664Z ORB2126 347 118 953 1984-09-30T22:52:43.508Z 1984-09-30T23:52:34.523Z ORB2127 252 118 953 1984-10-01T22:52:34.227Z 1984-10-01T23:52:07.258Z ORB2128 147 118 953 1984-10-02T23:10:17.023Z 1984-10-02T23:33:25.742Z ORB2129 257 118 953 1984-10-03T22:51:33.570Z 1984-10-03T23:51:00.344Z ORB2130 257 118 953 1984-10-04T22:51:05.352Z 1984-10-04T23:50:26.320Z ORB2131 409 118 953 1984-10-05T22:50:34.383Z 1984-10-05T23:50:18.922Z ORB2132 243 118 953 1984-10-06T22:50:02.445Z 1984-10-06T23:49:38.727Z ORB2133 356 118 953 1984-10-07T22:49:33.188Z 1984-10-07T23:48:23.547Z ORB2134 285 118 953 1984-10-08T22:48:59.266Z 1984-10-08T23:48:53.812Z ORB2135 259 118 953 1984-10-09T23:06:56.047Z 1984-10-09T23:48:24.742Z ORB2136 248 118 953 1984-10-10T22:47:59.820Z 1984-10-10T23:47:32.094Z ORB2137 199 118 953 1984-10-11T22:47:37.125Z 1984-10-11T23:47:03.406Z ORB2139 255 118 953 1984-10-13T22:46:24.969Z 1984-10-13T23:46:00.242Z ORB2140 422 118 953 1984-10-14T22:45:55.117Z 1984-10-14T23:45:42.773Z ORB2141 262 118 953 1984-10-15T22:45:16.773Z 1984-10-15T23:44:55.797Z ORB2142 154 118 953 1984-10-16T23:02:20.070Z 1984-10-16T23:26:26.078Z ORB2143 212 118 953 1984-10-17T22:44:15.352Z 1984-10-17T23:33:07.852Z ORB2144 262 118 953 1984-10-18T22:43:42.883Z 1984-10-18T23:43:04.664Z ORB2145 416 118 953 1984-10-19T22:43:09.656Z 1984-10-19T23:42:49.227Z ORB2146 258 118 953 1984-10-20T22:42:43.211Z 1984-10-20T23:41:59.000Z ORB2147 428 118 953 1984-10-21T22:41:59.930Z 1984-10-21T23:41:43.797Z ORB2148 289 118 953 1984-10-22T22:41:31.266Z 1984-10-22T23:41:06.328Z ORB2149 145 118 953 1984-10-23T22:58:16.859Z 1984-10-23T23:22:22.852Z ORB2150 185 118 953 1984-10-24T22:40:23.383Z 1984-10-24T23:39:30.875Z ORB2152 149 118 953 1984-10-26T22:57:12.500Z 1984-10-26T23:20:40.234Z ORB2153 70 118 953 1984-10-27T23:16:31.820Z 1984-10-27T23:38:15.281Z ORB2154 151 118 953 1984-10-28T22:56:00.352Z 1984-10-28T23:19:38.109Z ORB2155 237 118 953 1984-10-29T22:37:33.945Z 1984-10-29T23:37:14.469Z ORB2156 371 118 953 1984-10-30T22:36:58.469Z 1984-10-30T23:36:48.086Z ORB2157 220 118 953 1984-10-31T22:36:32.797Z 1984-10-31T23:36:05.828Z ORB2158 260 118 953 1984-11-01T22:35:50.320Z 1984-11-01T23:35:37.586Z ORB2159 154 118 953 1984-11-02T22:53:00.125Z 1984-11-02T23:18:01.938Z ORB2160 70 118 953 1984-11-03T22:49:32.469Z 1984-11-03T23:01:30.992Z ORB2161 278 118 953 1984-11-04T22:58:25.984Z 1984-11-04T23:33:59.641Z ORB2168 515 118 953 1984-11-11T22:30:31.680Z 1984-11-11T23:30:24.812Z ORB2169 286 118 953 1984-11-12T22:29:59.469Z 1984-11-12T23:29:50.492Z ORB2170 154 118 953 1984-11-13T22:51:45.359Z 1984-11-13T23:07:49.844Z ORB2171 301 118 953 1984-11-14T22:29:03.609Z 1984-11-14T23:28:58.633Z ORB2172 298 118 953 1984-11-15T22:28:43.148Z 1984-11-15T23:28:34.164Z ORB2173 512 118 953 1984-11-16T22:28:13.711Z 1984-11-16T23:28:07.172Z ORB2176 302 118 953 1984-11-19T22:27:00.836Z 1984-11-19T23:26:45.852Z ORB2177 279 118 953 1984-11-20T22:48:02.453Z 1984-11-20T23:22:41.711Z ORB2178 278 118 953 1984-11-21T22:29:23.328Z 1984-11-21T23:26:03.344Z ORB2179 334 118 953 1984-11-22T22:25:53.844Z 1984-11-22T23:25:45.156Z ORB2180 329 118 953 1984-11-23T22:25:38.281Z 1984-11-23T23:25:29.008Z ORB2181 379 118 953 1984-11-24T22:25:43.867Z 1984-11-24T23:25:16.594Z ORB2182 359 118 953 1984-11-25T22:25:08.969Z 1984-11-25T23:24:59.695Z ORB2183 370 118 953 1984-11-26T22:24:49.328Z 1984-11-26T23:24:40.203Z ORB2184 381 118 953 1984-11-27T22:24:43.203Z 1984-11-27T23:24:34.383Z ORB2185 380 118 953 1984-11-28T22:24:25.734Z 1984-11-28T23:24:17.055Z ORB2186 381 118 953 1984-11-29T22:24:15.430Z 1984-11-29T23:24:06.453Z ORB2187 348 118 953 1984-11-30T22:24:01.539Z 1984-11-30T23:18:40.281Z ORB2188 380 118 953 1984-12-01T22:23:47.555Z 1984-12-01T23:23:39.156Z ORB2189 371 118 953 1984-12-02T22:23:36.508Z 1984-12-02T23:23:27.984Z ORB2190 374 118 953 1984-12-03T22:24:33.883Z 1984-12-03T23:23:18.461Z ORB2191 18 118 953 1984-12-04T23:17:29.477Z 1984-12-04T23:22:56.266Z ORB2192 144 118 953 1984-12-05T22:35:35.633Z 1984-12-05T23:07:31.648Z ORB2193 298 118 953 1984-12-06T22:22:53.477Z 1984-12-06T23:22:44.648Z ORB2194 305 118 953 1984-12-07T22:35:29.617Z 1984-12-07T23:07:24.109Z ORB2195 381 118 953 1984-12-08T22:22:34.719Z 1984-12-08T23:22:26.188Z ORB2196 311 118 953 1984-12-09T22:36:32.141Z 1984-12-09T23:09:17.156Z ORB2197 368 118 953 1984-12-10T22:22:17.383Z 1984-12-10T23:22:08.109Z ORB2198 310 118 953 1984-12-11T22:36:23.359Z 1984-12-11T23:08:55.711Z ORB2199 369 118 953 1984-12-12T22:22:29.164Z 1984-12-12T23:21:52.133Z 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.