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
----------------------------------------------------------------------------
ORB2649 306 118 953 1986-03-07T22:58:58.281Z 1986-03-07T23:58:39.812Z
ORB2650 198 118 953 1986-03-08T22:59:40.039Z 1986-03-08T23:58:50.375Z
ORB2651 274 118 953 1986-03-09T22:49:07.500Z 1986-03-09T23:48:57.414Z
ORB2656 65 118 953 1986-03-14T22:50:22.102Z 1986-03-14T23:01:49.664Z
ORB2657 99 118 953 1986-03-15T22:50:48.750Z 1986-03-15T23:12:34.125Z
ORB2658 99 118 953 1986-03-16T22:50:48.742Z 1986-03-16T23:06:56.875Z
ORB2659 59 118 953 1986-03-17T22:51:21.633Z 1986-03-17T23:13:11.883Z
ORB2660 322 118 953 1986-03-18T22:51:23.781Z 1986-03-18T23:51:07.203Z
ORB2661 148 118 953 1986-03-19T22:51:31.727Z 1986-03-19T23:51:02.992Z
ORB2662 190 118 953 1986-03-20T22:51:47.523Z 1986-03-20T23:51:15.539Z
ORB2663 183 118 953 1986-03-21T23:20:32.547Z 1986-03-21T23:51:48.578Z
ORB2664 181 118 953 1986-03-22T22:52:15.102Z 1986-03-22T23:51:43.617Z
ORB2665 353 118 953 1986-03-23T22:52:22.141Z 1986-03-23T23:52:21.406Z
ORB2666 182 118 953 1986-03-24T22:52:41.922Z 1986-03-24T23:52:10.438Z
ORB2667 358 118 953 1986-03-25T22:52:59.562Z 1986-03-25T23:52:46.977Z
ORB2668 184 118 953 1986-03-26T22:53:09.492Z 1986-03-26T23:52:39.508Z
ORB2669 166 118 953 1986-03-27T22:53:22.352Z 1986-03-27T23:52:52.367Z
ORB2670 352 118 953 1986-03-28T22:53:35.469Z 1986-03-28T23:53:22.883Z
ORB2671 166 118 953 1986-03-29T22:53:37.375Z 1986-03-29T23:53:30.641Z
ORB2672 339 118 953 1986-03-30T22:53:49.156Z 1986-03-30T23:53:43.172Z
ORB2673 169 118 953 1986-03-31T22:54:07.680Z 1986-03-31T23:53:36.195Z
ORB2675 171 118 953 1986-04-02T22:54:27.203Z 1986-04-02T23:53:04.469Z
ORB2676 76 118 953 1986-04-03T23:17:27.703Z 1986-04-03T23:29:16.469Z
ORB2677 343 118 953 1986-04-04T22:54:39.492Z 1986-04-04T23:54:27.500Z
ORB2678 179 118 953 1986-04-05T22:54:54.016Z 1986-04-05T23:54:22.523Z
ORB2679 356 118 953 1986-04-06T22:54:55.039Z 1986-04-06T23:54:48.305Z
ORB2681 217 118 953 1986-04-08T23:18:22.562Z 1986-04-08T23:55:03.844Z
ORB2682 76 118 953 1986-04-09T23:18:06.344Z 1986-04-09T23:29:55.109Z
ORB2683 69 118 953 1986-04-10T23:19:09.320Z 1986-04-10T23:29:51.586Z
ORB2684 324 118 953 1986-04-11T22:55:31.500Z 1986-04-11T23:55:18.906Z
ORB2685 185 118 953 1986-04-12T22:55:35.414Z 1986-04-12T23:55:03.930Z
ORB2686 357 118 953 1986-04-13T22:55:45.039Z 1986-04-13T23:55:32.453Z
ORB2688 350 118 953 1986-04-15T22:55:50.719Z 1986-04-15T23:55:32.734Z
ORB2690 122 118 953 1986-04-17T23:11:07.719Z 1986-04-17T23:49:50.227Z
ORB2691 360 118 953 1986-04-18T22:55:44.703Z 1986-04-18T23:55:31.211Z
ORB2692 183 118 953 1986-04-19T22:55:51.727Z 1986-04-19T23:55:21.742Z
ORB2693 351 118 953 1986-04-20T22:55:44.250Z 1986-04-20T23:55:37.516Z
ORB2694 184 118 953 1986-04-21T22:55:51.023Z 1986-04-21T23:55:21.039Z
ORB2695 349 118 953 1986-04-22T22:55:42.547Z 1986-04-22T23:55:41.062Z
ORB2696 185 118 953 1986-04-23T22:55:47.562Z 1986-04-23T23:55:17.578Z
ORB2697 65 118 953 1986-04-24T23:19:20.312Z 1986-04-24T23:29:34.234Z
ORB2698 293 118 953 1986-04-25T22:55:34.203Z 1986-04-25T23:55:22.117Z
ORB2699 180 118 953 1986-04-26T22:55:38.633Z 1986-04-26T23:55:08.641Z
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.