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 ---------------------------------------------------------------------------- ORB4000 1133 118 953 1989-11-18T02:21:05.547Z 1989-11-18T04:20:03.587Z ORB4001 376 118 953 1989-11-19T02:21:07.530Z 1989-11-19T03:25:58.744Z ORB4002 1138 118 953 1989-11-20T02:21:34.519Z 1989-11-20T04:20:58.060Z ORB4003 1135 118 953 1989-11-21T02:22:00.078Z 1989-11-21T04:21:04.617Z ORB4004 1078 118 953 1989-11-22T02:21:41.385Z 1989-11-22T04:21:17.423Z ORB4005 204 118 953 1989-11-23T02:21:57.350Z 1989-11-23T03:26:36.083Z ORB4006 1137 118 953 1989-11-24T02:22:11.515Z 1989-11-24T04:21:34.553Z ORB4007 1140 118 953 1989-11-25T02:22:06.423Z 1989-11-25T04:21:42.462Z ORB4008 1138 118 953 1989-11-26T02:22:27.554Z 1989-11-26T04:21:51.094Z ORB4009 455 118 953 1989-11-27T02:22:29.022Z 1989-11-27T03:10:09.539Z ORB4010 108 118 953 1989-11-28T03:15:37.017Z 1989-11-28T04:22:09.063Z ORB4012 393 118 953 1989-11-30T02:22:36.768Z 1989-11-30T03:27:31.520Z ORB4013 1085 118 953 1989-12-01T02:22:56.531Z 1989-12-01T04:22:26.075Z ORB4014 1139 118 953 1989-12-02T02:23:03.296Z 1989-12-02T04:22:32.839Z ORB4015 419 118 953 1989-12-03T02:23:03.818Z 1989-12-03T03:27:48.843Z ORB4016 135 118 953 1989-12-04T02:23:03.837Z 1989-12-04T02:37:26.843Z ORB4017 424 118 953 1989-12-05T02:23:22.320Z 1989-12-05T03:28:04.541Z ORB4018 47 118 953 1989-12-06T03:20:55.099Z 1989-12-06T03:28:10.097Z ORB4019 389 118 953 1989-12-07T02:23:39.084Z 1989-12-07T03:07:32.599Z ORB4020 419 118 953 1989-12-08T02:23:24.846Z 1989-12-08T03:28:19.588Z ORB4021 912 118 953 1989-12-09T02:23:35.105Z 1989-12-09T03:59:14.642Z ORB4022 1140 118 953 1989-12-10T02:23:28.588Z 1989-12-10T04:23:04.132Z ORB4023 370 118 953 1989-12-11T02:23:37.102Z 1989-12-11T03:28:19.337Z ORB4024 1139 118 953 1989-12-12T02:23:50.614Z 1989-12-12T04:23:20.158Z ORB4025 1140 118 953 1989-12-13T02:23:46.350Z 1989-12-13T04:23:22.142Z ORB4027 1092 118 953 1989-12-15T02:23:40.363Z 1989-12-15T04:23:09.654Z ORB4028 1140 118 953 1989-12-16T02:23:34.087Z 1989-12-16T04:23:09.881Z ORB4029 544 118 953 1989-12-17T02:23:38.851Z 1989-12-17T03:57:24.885Z ORB4030 408 118 953 1989-12-18T02:23:30.863Z 1989-12-18T03:28:19.372Z ORB4031 347 118 953 1989-12-19T02:23:34.556Z 1989-12-19T03:28:13.291Z ORB4032 19 118 953 1989-12-20T04:19:18.874Z 1989-12-20T04:22:59.375Z ORB4033 1027 118 953 1989-12-21T02:23:22.308Z 1989-12-21T04:22:57.852Z ORB4034 244 118 953 1989-12-22T02:23:17.694Z 1989-12-22T03:28:02.664Z ORB4035 1141 118 953 1989-12-23T02:23:06.913Z 1989-12-23T04:22:48.956Z ORB4036 76 118 953 1989-12-24T03:16:07.185Z 1989-12-24T03:27:55.954Z ORB4037 240 118 953 1989-12-25T02:22:54.928Z 1989-12-25T03:27:49.927Z ORB4038 542 118 953 1989-12-26T02:23:00.939Z 1989-12-26T03:19:49.209Z ORB4039 1139 118 953 1989-12-27T02:22:52.624Z 1989-12-27T04:22:21.917Z ORB4040 103 118 953 1989-12-28T02:22:52.631Z 1989-12-28T03:27:21.879Z ORB4041 1140 118 953 1989-12-29T02:22:37.070Z 1989-12-29T04:22:12.864Z ORB4042 98 118 953 1989-12-30T02:22:29.324Z 1989-12-30T03:27:01.815Z ORB4043 1140 118 953 1989-12-31T02:22:12.765Z 1989-12-31T04:21:48.309Z ORB4044 1 118 953 1990-01-02T02:31:11.298Z 1990-01-02T02:31:11.298Z ORB4045 1034 118 953 1990-01-02T02:31:17.548Z 1990-01-02T04:19:45.587Z ORB4046 1116 118 953 1990-01-03T02:21:39.312Z 1990-01-03T04:21:15.104Z ORB4047 76 118 953 1990-01-04T03:14:24.325Z 1990-01-04T03:26:13.095Z ORB4048 1020 118 953 1990-01-05T02:33:52.093Z 1990-01-05T04:20:51.884Z ORB4049 379 118 953 1990-01-06T02:46:16.120Z 1990-01-06T03:25:57.635Z ORB4050 1139 118 953 1990-01-07T02:20:57.871Z 1990-01-07T04:20:27.415Z ORB4051 186 118 953 1990-01-08T02:20:32.382Z 1990-01-08T02:39:57.889Z ORB4052 1139 118 953 1990-01-09T02:20:31.891Z 1990-01-09T04:20:01.435Z ORB4053 322 118 953 1990-01-10T02:20:19.534Z 1990-01-10T02:54:01.797Z ORB4054 114 118 953 1990-01-11T03:12:30.794Z 1990-01-11T04:19:33.090Z ORB4055 1139 118 953 1990-01-12T02:19:38.025Z 1990-01-12T04:19:07.570Z ORB4056 524 118 953 1990-01-13T03:11:54.290Z 1990-01-13T04:18:54.331Z ORB4058 221 118 953 1990-01-15T03:11:33.019Z 1990-01-15T04:18:24.067Z ORB4059 1136 118 953 1990-01-16T02:18:37.468Z 1990-01-16T04:18:07.012Z ORB4060 1140 118 953 1990-01-17T02:18:16.975Z 1990-01-17T04:17:52.769Z ORB4061 79 118 953 1990-01-18T03:10:31.983Z 1990-01-18T03:22:49.215Z ORB4062 947 118 953 1990-01-19T02:17:38.923Z 1990-01-19T03:57:05.209Z ORB4063 1140 118 953 1990-01-20T02:17:30.175Z 1990-01-20T04:17:05.970Z ORB4064 1138 118 953 1990-01-21T02:17:21.423Z 1990-01-21T04:16:50.717Z ORB4066 131 118 953 1990-01-23T03:09:45.176Z 1990-01-23T04:16:18.971Z ORB4067 1134 118 953 1990-01-24T02:16:25.145Z 1990-01-24T04:16:06.937Z ORB4068 560 118 953 1990-01-25T03:09:26.654Z 1990-01-25T04:15:51.441Z ORB4069 1001 118 953 1990-01-26T02:16:07.127Z 1990-01-26T04:02:54.418Z ORB4070 587 118 953 1990-01-27T02:15:55.140Z 1990-01-27T03:17:27.163Z ORB4071 1140 118 953 1990-01-28T02:15:31.617Z 1990-01-28T04:15:07.410Z ORB4072 1000 118 953 1990-01-29T02:23:20.887Z 1990-01-29T04:14:55.679Z ORB4073 1127 118 953 1990-01-30T02:14:57.157Z 1990-01-30T04:14:32.949Z ORB4074 345 118 953 1990-01-31T03:07:40.905Z 1990-01-31T04:14:21.212Z ORB4075 310 118 953 1990-02-01T03:07:38.404Z 1990-02-01T04:14:10.692Z ORB4076 1134 118 953 1990-02-02T02:14:59.126Z 1990-02-02T04:13:57.170Z ORB4077 1 118 953 1990-02-07T02:13:36.709Z 1990-02-07T02:13:36.709Z ORB4078 1 118 953 1990-02-07T02:13:42.959Z 1990-02-07T02:13:42.959Z ORB4079 1 118 953 1990-02-07T02:13:49.210Z 1990-02-07T02:13:49.210Z ORB4081 1135 118 953 1990-02-07T02:13:55.460Z 1990-02-07T04:12:59.755Z ORB4082 73 118 953 1990-02-08T03:06:46.977Z 1990-02-08T03:18:07.220Z ORB4083 1081 118 953 1990-02-09T02:13:16.487Z 1990-02-09T04:07:37.278Z ORB4084 1131 118 953 1990-02-10T02:13:08.987Z 1990-02-10T04:12:38.533Z ORB4085 713 118 953 1990-02-11T02:12:55.520Z 1990-02-11T03:27:47.298Z ORB4086 911 118 953 1990-02-12T02:12:42.541Z 1990-02-12T03:48:21.825Z ORB4087 410 118 953 1990-02-13T02:12:43.062Z 1990-02-13T02:55:58.577Z ORB4089 1129 118 953 1990-02-15T02:12:21.851Z 1990-02-15T04:12:03.895Z ORB4090 77 118 953 1990-02-16T03:00:08.214Z 1990-02-16T03:24:05.100Z ORB4091 1 118 953 1990-02-19T02:12:13.395Z 1990-02-19T02:12:13.395Z ORB4093 1133 118 953 1990-02-19T02:12:19.645Z 1990-02-19T04:11:49.188Z ORB4094 1136 118 953 1990-02-20T02:12:17.669Z 1990-02-20T04:11:46.963Z ORB4095 474 118 953 1990-02-21T03:00:32.678Z 1990-02-21T04:11:45.745Z ORB4096 1 118 953 1990-02-24T02:12:13.994Z 1990-02-24T02:12:13.994Z ORB4098 1096 118 953 1990-02-24T02:12:20.244Z 1990-02-24T04:11:43.289Z ORB4099 1136 118 953 1990-02-25T02:12:08.269Z 1990-02-25T04:11:44.062Z 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.