https://spdf.gsfc.nasa.gov/pub/data/omni/high_res_omni/sc_specific/monthly/00readme.txt

This directory provides monthly files of spacecraft-specific ACE,
Wind and IMP 8 data sets created as part of the effort to create 
the High Resolution OMNI data set.  For 1995 and later, 15-16 sec 
magnetic field were shifted by Minimum Variance and/or Crossed 
Product techniques from their observation points to the bow shock 
nose.  For 1998-2000, 16 sec ACE magnetic field were shifted by 
each of four shift techniques from their observation points to the 
location of the Wind spacecraft.  Plasma parameters are also shifted
in both cases.  These data are extensively 
discussed at http://omniweb.gsfc.nasa.gov/html/HROdocum.html.

The file names have the form

scname_min_xxyyyymm.txt,
where
scname = ace, imp, wind or dscov
min = "1-min resolution"
xx = b, 2w, 3w, 4w, 5w, w
xx = b: data shifted to bow shock nose (by technique 4)
xx = 2w (ACE shifted to Wind by technique 2 - MVAB-0)
xx = 3w (ACE shifted to Wind by technique 3 - cross products) 
xx = 4w (ACE shifted to Wind by technique 4 - combination of 2 and 3)
xx = 5w (ACE shifted to Wind by technique 4 - another combo of 2 and 3)
xx = w  (unshifted Wind data)
yyyy = year 
mm = month (01...12)

The directory also contains a file detailing the common format of all the 
spacecraft-specific data sets.
--------------------------------------------------------------
Related data and directories:
SPDF Data and Orbits Services <http://spdf.gsfc.nasa.gov/>

 -------------------------------------------
  Acknowledgement:

 Use of these data in publications should be accompanied by
 acknowledgements of the 
Space Physics Data Facility(SPDF) and
National Space Science Data Center(NSSDC)
              
-------------------------------------------------------------------------
SPDF Contact: Natalia Papitashvili <Natalia.E.Papitashvili@nasa.gov>

---------------------------------------------------------------------------
Authorizing NASA Official: Dr. R.E. McGuire, Head, SPDF, NASA Goddard Space Flight Center
                        301-286-7794, e-mail:  Robert.E.McGuire@nasa.gov