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
----------------------------------------------------------------------------
ORB5000 193 118 953 1992-08-14T00:14:04.234Z 1992-08-14T00:52:25.784Z
ORB5001 262 118 953 1992-08-15T00:14:04.200Z 1992-08-15T00:52:30.213Z
ORB5002 258 118 953 1992-08-16T00:16:19.646Z 1992-08-16T00:52:38.672Z
ORB5003 260 118 953 1992-08-17T00:17:51.122Z 1992-08-17T00:52:44.633Z
ORB5004 251 118 953 1992-08-18T00:16:01.586Z 1992-08-18T00:52:48.098Z
ORB5005 93 118 953 1992-08-19T00:14:47.512Z 1992-08-19T00:52:42.065Z
ORB5006 258 118 953 1992-08-20T00:14:52.976Z 1992-08-20T00:52:53.988Z
ORB5007 91 118 953 1992-08-21T00:17:44.158Z 1992-08-21T00:52:32.201Z
ORB5008 209 118 953 1992-08-21T23:14:02.875Z 1992-08-22T00:53:20.652Z
ORB5009 55 118 953 1992-08-23T00:36:00.052Z 1992-08-23T00:53:00.018Z
ORB5010 243 118 953 1992-08-24T00:11:03.965Z 1992-08-24T00:53:31.528Z
ORB5011 258 118 953 1992-08-25T00:15:38.414Z 1992-08-25T00:53:40.427Z
ORB5012 249 118 953 1992-08-26T00:17:21.325Z 1992-08-26T00:53:47.855Z
ORB5013 246 118 953 1992-08-27T00:19:12.279Z 1992-08-27T00:53:52.790Z
ORB5014 76 118 953 1992-08-28T00:19:20.960Z 1992-08-28T00:27:13.462Z
ORB5015 251 118 953 1992-08-29T00:11:58.872Z 1992-08-29T00:54:10.182Z
ORB5016 258 118 953 1992-08-30T00:15:49.636Z 1992-08-30T00:54:17.148Z
ORB5017 256 118 953 1992-08-31T00:17:29.304Z 1992-08-31T00:54:24.829Z
ORB5018 254 118 953 1992-09-01T00:19:52.531Z 1992-09-01T00:54:26.543Z
ORB5019 253 118 953 1992-09-02T00:19:51.994Z 1992-09-02T00:54:32.255Z
ORB5020 130 118 953 1992-09-03T00:11:50.842Z 1992-09-03T00:54:22.342Z
ORB5021 257 118 953 1992-09-04T00:15:57.563Z 1992-09-04T00:54:51.575Z
ORB5022 240 118 953 1992-09-05T00:18:54.729Z 1992-09-05T00:54:53.256Z
ORB5023 260 118 953 1992-09-06T00:20:09.458Z 1992-09-06T00:54:47.969Z
ORB5024 248 118 953 1992-09-07T00:19:41.918Z 1992-09-07T00:54:21.927Z
ORB5025 116 118 953 1992-09-08T00:09:50.324Z 1992-09-08T00:53:30.385Z
ORB5026 247 118 953 1992-09-09T00:15:18.052Z 1992-09-09T00:52:55.563Z
ORB5028 257 118 953 1992-09-11T00:15:17.871Z 1992-09-11T00:51:44.399Z
ORB5029 250 118 953 1992-09-12T00:16:25.572Z 1992-09-12T00:50:45.081Z
ORB5030 247 118 953 1992-09-13T00:14:38.001Z 1992-09-13T00:49:06.011Z
ORB5031 260 118 953 1992-09-14T00:01:57.435Z 1992-09-14T00:45:43.973Z
ORB5032 270 118 953 1992-09-15T00:03:46.568Z 1992-09-15T00:42:21.620Z
ORB5033 252 118 953 1992-09-16T00:01:58.289Z 1992-09-16T00:36:13.799Z
ORB5034 249 118 953 1992-09-16T23:56:50.742Z 1992-09-17T00:31:35.757Z
ORB5035 231 118 953 1992-09-17T23:43:12.172Z 1992-09-18T00:25:45.713Z
ORB5036 235 118 953 1992-09-18T23:42:00.633Z 1992-09-19T00:19:19.395Z
ORB5037 247 118 953 1992-09-19T23:38:18.828Z 1992-09-20T00:14:16.856Z
ORB5038 238 118 953 1992-09-20T23:33:18.805Z 1992-09-21T00:08:16.317Z
ORB5039 263 118 953 1992-09-21T23:26:59.516Z 1992-09-22T00:01:46.027Z
ORB5040 248 118 953 1992-09-22T23:11:23.438Z 1992-09-22T23:53:36.234Z
ORB5041 261 118 953 1992-09-23T23:06:23.906Z 1992-09-23T23:44:13.914Z
ORB5042 260 118 953 1992-09-24T22:58:55.820Z 1992-09-24T23:35:21.844Z
ORB5043 262 118 953 1992-09-25T22:51:31.805Z 1992-09-25T23:26:05.562Z
ORB5044 265 118 953 1992-09-26T22:41:26.258Z 1992-09-26T23:15:59.766Z
ORB5045 249 118 953 1992-09-27T22:21:37.922Z 1992-09-27T23:03:50.977Z
ORB5046 260 118 953 1992-09-28T22:12:51.148Z 1992-09-28T22:51:02.164Z
ORB5047 264 118 953 1992-09-29T22:02:13.578Z 1992-09-29T22:38:33.117Z
ORB5048 259 118 953 1992-09-30T21:51:20.312Z 1992-09-30T22:25:47.820Z
ORB5049 255 118 953 1992-10-01T21:37:37.766Z 1992-10-01T22:12:15.781Z
ORB5050 190 118 953 1992-10-02T21:12:53.688Z 1992-10-02T21:55:17.727Z
ORB5051 262 118 953 1992-10-03T21:01:08.391Z 1992-10-03T21:39:09.406Z
ORB5052 260 118 953 1992-10-04T20:46:15.578Z 1992-10-04T21:22:41.109Z
ORB5053 173 118 953 1992-10-05T20:29:06.547Z 1992-10-05T21:03:58.555Z
ORB5054 205 118 953 1992-10-06T20:07:45.492Z 1992-10-06T20:42:24.500Z
ORB5055 202 118 953 1992-10-07T19:40:20.898Z 1992-10-07T20:09:54.164Z
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.