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 <bits/sec>
LAT float Venusian Latitude <deg>
LON float Venusian Longitude <deg>
ALT float Altitude <km>
SZA float Solar Zenith Angle <deg>
SHA float Solar Hour Angle <hr>
MASS1 int Mass of Sample 1 <AMU>
DEN1 float Number density of Sample 1 <ions/cm^3>
MASS2 int Mass of Sample 2 <AMU>
DEN2 float Number density of Sample 2 <ions/cm^3>
. . .
. . .
. . .
MASS55 int Mass of Sample 55 <AMU>
DEN55 float Number density of Sample 55 <ions/cm^3>
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
----------------------------------------------------------------------------
ORB2001 196 118 953 1984-05-28T23:37:55.312Z 1984-05-29T00:37:24.340Z
ORB2036 86 118 953 1984-07-02T23:23:59.586Z 1984-07-03T00:09:19.610Z
ORB2037 361 118 953 1984-07-03T23:23:16.172Z 1984-07-04T00:22:54.200Z
ORB2038 135 118 953 1984-07-04T23:22:54.766Z 1984-07-05T00:22:34.788Z
ORB2039 69 118 953 1984-07-05T23:36:03.617Z 1984-07-05T23:46:55.797Z
ORB2040 431 118 953 1984-07-06T23:21:40.547Z 1984-07-07T00:21:29.976Z
ORB2041 217 118 953 1984-07-07T23:21:28.531Z 1984-07-08T00:20:39.560Z
ORB2042 460 118 953 1984-07-08T23:20:34.109Z 1984-07-09T00:20:27.134Z
ORB2043 204 118 953 1984-07-09T23:20:05.680Z 1984-07-10T00:15:42.702Z
ORB2044 454 118 953 1984-07-10T23:19:33.852Z 1984-07-11T00:19:19.276Z
ORB2045 157 118 953 1984-07-11T23:19:19.820Z 1984-07-12T00:18:48.846Z
ORB2046 251 118 953 1984-07-12T23:18:31.391Z 1984-07-13T00:18:15.216Z
ORB2047 458 118 953 1984-07-13T23:17:57.977Z 1984-07-14T00:17:43.992Z
ORB2048 162 118 953 1984-07-14T23:17:40.547Z 1984-07-15T00:17:12.562Z
ORB2049 390 118 953 1984-07-15T23:16:49.109Z 1984-07-16T00:16:45.132Z
ORB2050 131 118 953 1984-07-16T23:33:44.133Z 1984-07-16T23:57:59.406Z
ORB2051 458 118 953 1984-07-17T23:15:48.750Z 1984-07-18T00:15:36.770Z
ORB2052 143 118 953 1984-07-18T23:15:33.328Z 1984-07-19T00:15:11.344Z
ORB2053 218 118 953 1984-07-19T23:15:07.906Z 1984-07-20T00:14:36.920Z
ORB2054 454 118 953 1984-07-20T23:14:28.078Z 1984-07-21T00:14:12.495Z
ORB2055 210 118 953 1984-07-21T23:14:03.047Z 1984-07-22T00:13:40.063Z
ORB2056 384 118 953 1984-07-22T23:13:24.602Z 1984-07-23T00:13:20.623Z
ORB2057 210 118 953 1984-07-23T23:13:05.180Z 1984-07-24T00:12:45.196Z
ORB2058 154 118 953 1984-07-24T23:30:04.703Z 1984-07-24T23:54:19.977Z
ORB2059 202 118 953 1984-07-25T23:12:24.328Z 1984-07-26T00:11:53.351Z
ORB2060 173 118 953 1984-07-26T23:11:49.906Z 1984-07-27T00:11:09.928Z
ORB2061 390 118 953 1984-07-27T23:11:10.484Z 1984-07-28T00:11:01.506Z
ORB2062 173 118 953 1984-07-28T23:11:10.062Z 1984-07-29T00:10:43.083Z
ORB2063 156 118 953 1984-07-29T23:34:24.961Z 1984-07-29T23:50:40.969Z
ORB2064 160 118 953 1984-07-30T23:10:17.219Z 1984-07-31T00:09:42.238Z
ORB2065 311 118 953 1984-07-31T23:23:23.797Z 1984-07-31T23:55:57.156Z
ORB2066 192 118 953 1984-08-01T23:09:32.375Z 1984-08-02T00:08:53.396Z
ORB2067 125 118 953 1984-08-02T23:22:29.961Z 1984-08-02T23:48:44.969Z
ORB2068 433 118 953 1984-08-03T23:08:29.539Z 1984-08-04T00:08:16.559Z
ORB2069 199 118 953 1984-08-04T23:08:26.117Z 1984-08-05T00:07:47.138Z
ORB2070 430 118 953 1984-08-05T23:07:53.695Z 1984-08-06T00:07:47.713Z
ORB2071 214 118 953 1984-08-06T23:07:32.266Z 1984-08-07T00:07:00.289Z
ORB2072 319 118 953 1984-08-07T23:22:14.852Z 1984-08-07T23:55:37.727Z
ORB2073 146 118 953 1984-08-08T23:07:39.430Z 1984-08-09T00:06:27.447Z
ORB2075 363 118 953 1984-08-10T23:06:01.891Z 1984-08-11T00:05:59.613Z
ORB2076 262 118 953 1984-08-11T23:05:49.273Z 1984-08-12T00:05:43.290Z
ORB2077 487 118 953 1984-08-12T23:05:33.250Z 1984-08-13T00:05:28.267Z
ORB2078 191 118 953 1984-08-13T23:05:30.828Z 1984-08-13T23:53:46.836Z
ORB2079 458 118 953 1984-08-14T23:04:53.398Z 1984-08-15T00:04:44.817Z
ORB2080 174 118 953 1984-08-15T23:21:41.977Z 1984-08-16T00:04:06.935Z
ORB2083 211 118 953 1984-08-18T23:04:57.695Z 1984-08-19T00:03:50.714Z
ORB2084 347 118 953 1984-08-19T23:03:47.875Z 1984-08-20T00:03:17.290Z
ORB2085 136 118 953 1984-08-20T23:20:16.844Z 1984-08-20T23:49:53.859Z
ORB2086 287 118 953 1984-08-21T23:19:49.719Z 1984-08-21T23:50:03.336Z
ORB2087 201 118 953 1984-08-22T23:03:27.992Z 1984-08-23T00:02:55.614Z
ORB2088 194 118 953 1984-08-23T23:02:58.562Z 1984-08-24T00:01:49.584Z
ORB2089 461 118 953 1984-08-24T23:02:48.141Z 1984-08-25T00:02:18.158Z
ORB2090 218 118 953 1984-08-25T23:02:44.711Z 1984-08-26T00:01:51.731Z
ORB2092 205 118 953 1984-08-27T23:02:20.820Z 1984-08-28T00:01:27.842Z
ORB2093 455 118 953 1984-08-28T23:02:02.992Z 1984-08-29T00:01:45.417Z
ORB2094 201 118 953 1984-08-29T23:02:00.961Z 1984-08-30T00:00:57.984Z
ORB2095 198 118 953 1984-08-30T23:01:54.539Z 1984-08-31T00:00:42.555Z
ORB2096 237 118 953 1984-08-31T23:01:31.109Z 1984-08-31T23:48:09.117Z
ORB2097 210 118 953 1984-09-01T23:01:24.672Z 1984-09-02T00:00:26.695Z
ORB2098 125 118 953 1984-09-02T23:00:59.242Z 1984-09-02T23:19:51.242Z
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.