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 ---------------------------------------------------------------------------- ORB1101 561 118 953 1981-12-11T01:21:25.236Z 1981-12-11T02:20:13.216Z ORB1102 571 118 953 1981-12-12T01:21:28.545Z 1981-12-12T02:21:19.370Z ORB1103 571 118 953 1981-12-13T01:21:31.941Z 1981-12-13T02:21:22.967Z ORB1104 570 118 953 1981-12-14T01:21:32.744Z 1981-12-14T02:21:17.520Z ORB1105 570 118 953 1981-12-15T01:21:28.891Z 1981-12-15T02:21:13.617Z ORB1106 570 118 953 1981-12-16T01:21:32.231Z 1981-12-16T02:21:23.257Z ORB1107 567 118 953 1981-12-17T01:21:29.180Z 1981-12-17T02:21:20.256Z ORB1108 572 118 953 1981-12-18T01:21:26.729Z 1981-12-18T02:21:24.204Z ORB1109 571 118 953 1981-12-19T01:21:27.224Z 1981-12-19T02:21:18.249Z ORB1110 572 118 953 1981-12-20T01:21:20.556Z 1981-12-20T02:21:17.780Z ORB1111 566 118 953 1981-12-21T01:21:17.467Z 1981-12-21T02:21:14.740Z ORB1112 571 118 953 1981-12-22T01:21:16.459Z 1981-12-22T02:21:07.484Z ORB1113 507 118 953 1981-12-23T01:21:12.745Z 1981-12-23T02:14:20.571Z ORB1114 569 118 953 1981-12-24T01:21:02.146Z 1981-12-24T02:20:59.522Z ORB1115 492 118 953 1981-12-25T01:21:00.496Z 1981-12-25T02:12:33.770Z ORB1116 843 118 953 1981-12-26T01:20:53.602Z 1981-12-26T02:11:55.375Z ORB1117 488 118 953 1981-12-27T01:20:46.756Z 1981-12-27T02:11:54.729Z ORB1118 359 118 953 1981-12-28T01:20:36.702Z 1981-12-28T02:20:33.834Z ORB1119 524 118 953 1981-12-29T01:20:27.208Z 1981-12-29T02:15:22.186Z ORB1121 568 118 953 1981-12-31T01:20:12.367Z 1981-12-31T02:20:03.443Z ORB1122 475 118 953 1982-12-31T01:20:02.726Z 1982-12-31T02:09:48.997Z ORB1123 572 118 953 1982-01-02T01:19:49.079Z 1982-01-02T02:19:46.450Z ORB1125 572 118 953 1982-01-04T01:19:27.730Z 1982-01-04T02:19:25.017Z ORB1126 562 118 953 1982-01-05T01:19:19.391Z 1982-01-05T02:18:13.667Z ORB1128 565 118 953 1982-01-07T01:18:51.952Z 1982-01-07T02:18:42.976Z ORB1129 430 118 953 1982-01-08T01:18:38.311Z 1982-01-08T02:18:29.282Z ORB1130 519 118 953 1982-01-09T01:18:27.617Z 1982-01-09T02:12:50.842Z ORB1131 535 118 953 1982-01-10T01:18:09.872Z 1982-01-10T02:18:07.247Z ORB1132 572 118 953 1982-01-11T01:17:54.283Z 1982-01-11T02:17:51.458Z ORB1133 567 118 953 1982-01-12T01:17:41.994Z 1982-01-12T02:17:07.921Z ORB1134 547 118 953 1982-01-13T01:17:30.505Z 1982-01-13T02:14:50.530Z ORB1135 564 118 953 1982-01-14T01:17:15.664Z 1982-01-14T02:17:06.741Z ORB1136 571 118 953 1982-01-15T01:16:58.225Z 1982-01-15T02:16:49.350Z ORB1137 547 118 953 1982-01-16T01:16:44.340Z 1982-01-16T02:15:25.865Z ORB1138 571 118 953 1982-01-17T01:16:28.448Z 1982-01-17T02:16:19.473Z ORB1139 554 118 953 1982-01-18T01:16:11.164Z 1982-01-18T02:14:21.340Z ORB1140 570 118 953 1982-01-19T01:15:54.428Z 1982-01-19T02:15:51.707Z ORB1141 572 118 953 1982-01-20T01:15:40.046Z 1982-01-20T02:15:37.473Z ORB1142 566 118 953 1982-01-21T01:15:26.905Z 1982-01-21T02:15:18.030Z ORB1143 565 118 953 1982-01-22T01:15:09.312Z 1982-01-22T02:14:35.042Z ORB1144 532 118 953 1982-01-23T01:14:53.627Z 1982-01-23T02:12:44.903Z ORB1145 544 118 953 1982-01-24T01:14:37.335Z 1982-01-24T02:11:38.262Z ORB1146 569 118 953 1982-01-25T01:14:24.002Z 1982-01-25T02:14:02.378Z ORB1147 571 118 953 1982-01-26T01:14:12.815Z 1982-01-26T02:14:04.042Z ORB1148 571 118 953 1982-01-27T01:13:58.367Z 1982-01-27T02:13:49.296Z ORB1149 565 118 953 1982-01-28T01:13:41.435Z 1982-01-28T02:13:32.560Z ORB1151 492 118 953 1982-01-30T01:13:11.819Z 1982-01-30T02:13:08.995Z ORB1152 572 118 953 1982-01-31T01:13:00.885Z 1982-01-31T02:12:58.205Z ORB1153 572 118 953 1982-02-01T01:12:46.399Z 1982-02-01T02:12:43.875Z ORB1154 571 118 953 1982-02-02T01:12:39.021Z 1982-02-02T02:12:30.088Z ORB1155 572 118 953 1982-02-03T01:12:22.243Z 1982-02-03T02:12:19.721Z ORB1156 566 118 953 1982-02-04T01:12:11.315Z 1982-02-04T02:12:08.692Z ORB1157 572 118 953 1982-02-05T01:12:01.629Z 1982-02-05T02:11:58.956Z ORB1158 569 118 953 1982-02-06T01:11:52.297Z 1982-02-06T02:11:43.322Z ORB1159 572 118 953 1982-02-07T01:11:40.060Z 1982-02-07T02:11:37.508Z ORB1160 528 118 953 1982-02-08T01:11:34.872Z 1982-02-08T02:06:54.998Z ORB1161 567 118 953 1982-02-09T01:11:25.237Z 1982-02-09T02:11:16.263Z ORB1162 132 118 953 1982-02-10T01:11:14.299Z 1982-02-10T01:24:59.758Z ORB1163 567 118 953 1982-02-11T01:11:06.066Z 1982-02-11T02:11:03.290Z ORB1164 561 118 953 1982-02-12T01:11:00.430Z 1982-02-12T02:09:54.707Z ORB1165 360 118 953 1982-02-13T01:10:57.488Z 1982-02-13T01:48:39.311Z ORB1166 571 118 953 1982-02-14T01:10:51.905Z 1982-02-14T02:10:42.981Z ORB1167 355 118 953 1982-02-15T01:10:44.068Z 1982-02-15T02:09:44.544Z ORB1168 572 118 953 1982-02-16T01:10:38.630Z 1982-02-16T02:10:35.748Z ORB1169 572 118 953 1982-02-17T01:10:35.242Z 1982-02-17T02:10:32.466Z ORB1170 567 118 953 1982-02-18T01:10:32.355Z 1982-02-18T02:10:23.582Z ORB1171 556 118 953 1982-02-19T01:10:27.820Z 1982-02-19T02:08:44.248Z ORB1172 502 118 953 1982-02-20T01:10:25.084Z 1982-02-20T02:03:01.357Z ORB1174 571 118 953 1982-02-22T01:10:28.509Z 1982-02-22T02:10:19.536Z ORB1175 571 118 953 1982-02-23T01:10:28.022Z 1982-02-23T02:10:19.050Z ORB1176 381 118 953 1982-02-24T01:10:24.839Z 1982-02-24T01:50:18.808Z ORB1177 561 118 953 1982-02-25T01:10:28.555Z 1982-02-25T02:10:19.577Z ORB1178 248 118 953 1982-02-26T01:10:29.417Z 1982-02-26T02:07:49.295Z ORB1179 571 118 953 1982-02-27T01:10:31.381Z 1982-02-27T02:10:22.504Z ORB1180 571 118 953 1982-02-28T01:10:31.095Z 1982-02-28T02:10:22.020Z ORB1181 571 118 953 1982-03-01T01:10:34.506Z 1982-03-01T02:10:25.686Z ORB1182 571 118 953 1982-03-02T01:10:36.223Z 1982-03-02T02:10:27.350Z ORB1183 571 118 953 1982-03-03T01:10:43.091Z 1982-03-03T02:10:34.218Z ORB1184 568 118 953 1982-03-04T01:10:45.356Z 1982-03-04T02:10:36.383Z ORB1185 572 118 953 1982-03-05T01:10:45.925Z 1982-03-05T02:10:43.152Z ORB1186 571 118 953 1982-03-06T01:10:50.494Z 1982-03-06T02:10:41.521Z ORB1187 570 118 953 1982-03-07T01:10:56.313Z 1982-03-07T02:10:47.390Z ORB1188 572 118 953 1982-03-08T01:10:57.878Z 1982-03-08T02:10:55.255Z ORB1189 571 118 953 1982-03-09T01:11:06.297Z 1982-03-09T02:10:57.373Z ORB1191 549 118 953 1982-03-11T01:11:16.376Z 1982-03-11T02:09:07.554Z ORB1192 571 118 953 1982-03-12T01:11:20.388Z 1982-03-12T02:11:11.362Z ORB1193 121 118 953 1982-03-13T01:11:22.692Z 1982-03-13T01:23:58.750Z ORB1194 565 118 953 1982-03-14T01:11:29.602Z 1982-03-14T02:10:42.877Z ORB1195 220 118 953 1982-03-15T01:11:34.454Z 1982-03-15T02:11:31.730Z ORB1196 571 118 953 1982-03-16T01:11:43.807Z 1982-03-16T02:11:34.831Z ORB1197 559 118 953 1982-03-17T01:11:44.660Z 1982-03-17T02:11:41.836Z ORB1198 567 118 953 1982-03-18T01:11:52.809Z 1982-03-18T02:11:49.930Z ORB1199 521 118 953 1982-03-19T01:11:56.108Z 1982-03-19T02:07:41.632Z 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.