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 ---------------------------------------------------------------------------- ORB4101 1068 118 953 1990-02-27T02:12:04.063Z 1990-02-27T04:09:52.859Z ORB4102 75 118 953 1990-02-28T02:55:30.363Z 1990-02-28T03:26:36.375Z ORB4103 1125 118 953 1990-03-01T02:12:14.619Z 1990-03-01T04:11:50.038Z ORB4104 918 118 953 1990-03-02T02:12:30.760Z 1990-03-02T03:54:53.046Z ORB4105 986 118 953 1990-03-03T02:12:20.009Z 1990-03-03T03:56:36.171Z ORB4106 1135 118 953 1990-03-04T02:12:23.635Z 1990-03-04T02:41:32.129Z ORB4107 488 118 953 1990-03-05T02:12:26.885Z 1990-03-05T03:04:00.280Z ORB4108 77 118 953 1990-03-06T02:55:01.287Z 1990-03-06T03:26:55.298Z ORB4109 1305 118 953 1990-03-07T02:12:29.234Z 1990-03-07T04:12:11.275Z ORB4110 1049 118 953 1990-03-08T02:12:43.477Z 1990-03-08T04:12:17.019Z ORB4111 1136 118 953 1990-03-09T02:12:35.728Z 1990-03-09T04:12:17.769Z ORB4112 1137 118 953 1990-03-10T02:12:40.229Z 1990-03-10T04:12:22.271Z ORB4113 1001 118 953 1990-03-11T02:12:57.226Z 1990-03-11T04:12:26.644Z ORB4114 629 118 953 1990-03-12T02:49:09.120Z 1990-03-12T04:12:31.400Z ORB4115 76 118 953 1990-03-13T02:55:54.130Z 1990-03-13T03:27:24.141Z ORB4124 1 118 953 1990-03-24T02:13:40.083Z 1990-03-24T02:13:40.083Z ORB4126 1113 118 953 1990-03-24T02:13:46.583Z 1990-03-24T04:13:22.125Z ORB4128 1135 118 953 1990-03-26T02:13:45.576Z 1990-03-26T04:13:21.367Z ORB4133 1 118 953 1990-04-02T02:13:50.125Z 1990-04-02T02:13:50.125Z ORB4135 1130 118 953 1990-04-02T02:13:56.375Z 1990-04-02T04:13:25.916Z ORB4136 1 118 953 1990-04-10T02:13:29.228Z 1990-04-10T02:13:29.228Z ORB4137 1 118 953 1990-04-10T02:13:35.478Z 1990-04-10T02:13:35.478Z ORB4138 1 118 953 1990-04-10T02:13:41.727Z 1990-04-10T02:13:41.727Z ORB4139 1 118 953 1990-04-10T02:13:48.227Z 1990-04-10T02:13:48.227Z ORB4140 1 118 953 1990-04-10T02:13:54.477Z 1990-04-10T02:13:54.477Z ORB4141 1 118 953 1990-04-10T02:14:00.727Z 1990-04-10T02:14:00.727Z ORB4143 1130 118 953 1990-04-10T02:14:06.977Z 1990-04-10T04:12:58.768Z ORB4144 1 118 953 1990-04-13T02:13:13.147Z 1990-04-13T02:13:13.147Z ORB4146 1132 118 953 1990-04-13T02:13:19.397Z 1990-04-13T04:12:42.688Z ORB4147 1131 118 953 1990-04-14T02:12:55.640Z 1990-04-14T04:12:31.432Z ORB4148 1135 118 953 1990-04-15T02:12:53.878Z 1990-04-15T04:12:23.420Z ORB4149 845 118 953 1990-04-16T02:13:35.119Z 1990-04-16T04:10:52.409Z ORB4150 88 118 953 1990-04-17T03:01:12.633Z 1990-04-17T04:12:05.407Z ORB4151 1 118 953 1990-05-03T02:09:50.841Z 1990-05-03T02:09:50.841Z ORB4152 1 118 953 1990-05-03T02:09:59.841Z 1990-05-03T02:09:59.841Z ORB4153 1 118 953 1990-05-03T02:10:09.591Z 1990-05-03T02:10:09.591Z ORB4154 1 118 953 1990-05-03T02:10:18.591Z 1990-05-03T02:10:18.591Z ORB4155 1 118 953 1990-05-03T02:10:28.341Z 1990-05-03T02:10:28.341Z ORB4156 1 118 953 1990-05-03T02:10:38.091Z 1990-05-03T02:10:38.091Z ORB4158 1 118 953 1990-05-03T02:10:47.091Z 1990-05-03T02:10:47.091Z ORB4159 1 118 953 1990-05-03T02:10:56.841Z 1990-05-03T02:10:56.841Z ORB4160 1 118 953 1990-05-03T02:11:05.841Z 1990-05-03T02:11:05.841Z ORB4161 1 118 953 1990-05-03T02:11:15.592Z 1990-05-03T02:11:15.592Z ORB4162 1 118 953 1990-05-03T02:11:25.342Z 1990-05-03T02:11:25.342Z ORB4163 1 118 953 1990-05-03T02:11:34.342Z 1990-05-03T02:11:34.342Z ORB4164 1 118 953 1990-05-03T02:11:44.092Z 1990-05-03T02:11:44.092Z ORB4166 737 118 953 1990-05-03T02:11:53.092Z 1990-05-03T04:08:54.632Z ORB4167 756 118 953 1990-05-04T02:09:44.303Z 1990-05-04T04:08:39.092Z ORB4168 241 118 953 1990-05-05T02:09:29.786Z 1990-05-05T02:47:17.800Z ORB4169 758 118 953 1990-05-06T02:08:36.012Z 1990-05-06T04:08:08.303Z ORB4170 756 118 953 1990-05-07T02:08:20.465Z 1990-05-07T04:07:52.756Z ORB4171 201 118 953 1990-05-08T03:01:25.691Z 1990-05-08T04:07:34.733Z ORB4172 755 118 953 1990-05-09T02:08:18.663Z 1990-05-09T04:07:13.453Z ORB4173 1 118 953 1990-06-22T01:56:51.667Z 1990-06-22T01:56:51.667Z ORB4174 1 118 953 1990-06-22T01:57:00.661Z 1990-06-22T01:57:00.661Z ORB4175 1 118 953 1990-06-22T01:57:09.654Z 1990-06-22T01:57:09.654Z ORB4176 1 118 953 1990-06-22T01:57:18.648Z 1990-06-22T01:57:18.648Z ORB4177 1 118 953 1990-06-22T01:57:29.142Z 1990-06-22T01:57:29.142Z ORB4178 1 118 953 1990-06-22T01:57:38.136Z 1990-06-22T01:57:38.136Z ORB4179 1 118 953 1990-06-22T01:57:47.129Z 1990-06-22T01:57:47.129Z ORB4180 1 118 953 1990-06-22T01:57:57.623Z 1990-06-22T01:57:57.623Z ORB4181 1 118 953 1990-06-22T01:58:06.616Z 1990-06-22T01:58:06.616Z ORB4182 1 118 953 1990-06-22T01:58:15.675Z 1990-06-22T01:58:15.675Z ORB4183 1 118 953 1990-06-22T01:58:26.168Z 1990-06-22T01:58:26.168Z ORB4184 1 118 953 1990-06-22T01:58:35.162Z 1990-06-22T01:58:35.162Z ORB4185 1 118 953 1990-06-22T01:58:44.156Z 1990-06-22T01:58:44.156Z ORB4186 1 118 953 1990-06-22T01:58:53.150Z 1990-06-22T01:58:53.150Z ORB4187 1 118 953 1990-06-22T01:59:03.644Z 1990-06-22T01:59:03.644Z ORB4188 1 118 953 1990-06-22T01:59:12.637Z 1990-06-22T01:59:12.637Z ORB4189 1 118 953 1990-06-22T01:59:21.631Z 1990-06-22T01:59:21.631Z ORB4190 1 118 953 1990-06-22T01:59:32.125Z 1990-06-22T01:59:32.125Z ORB4191 1 118 953 1990-06-22T01:59:41.118Z 1990-06-22T01:59:41.118Z ORB4192 1 118 953 1990-06-22T01:59:50.177Z 1990-06-22T01:59:50.177Z ORB4193 1 118 953 1990-06-22T02:00:00.670Z 1990-06-22T02:00:00.670Z ORB4194 1 118 953 1990-06-22T02:00:09.665Z 1990-06-22T02:00:09.665Z ORB4195 1 118 953 1990-06-22T02:00:18.659Z 1990-06-22T02:00:18.659Z ORB4196 1 118 953 1990-06-22T02:00:27.652Z 1990-06-22T02:00:27.652Z ORB4197 1 118 953 1990-06-22T02:00:38.146Z 1990-06-22T02:00:38.146Z ORB4198 1 118 953 1990-06-22T02:00:47.140Z 1990-06-22T02:00:47.140Z ORB4199 1 118 953 1990-06-22T02:00:56.133Z 1990-06-22T02:00:56.133Z 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.