Some support is provided for files produced by the World Data Centre for Solar Terrestrial Physics. The format itself apparently has no name, but files in this format look something like the following:
Column formats and units - (Fixed format columns which are single space separated.)
------------------------
Datetime (YYYY mm dd HHMMSS) %4d %2d %2d %6d -
%1s
aa index - 3-HOURLY (Provisional) %3d nT
2000 01 01 000000 67
2000 01 01 030000 32
...
Support for this (obsolete?) format may not be very complete or robust.
This format cannot be automatically identified by its content, so in general it is necessary to specify that a table is in WDC format when reading it.