https://spdf.gsfc.nasa.gov/pub/data/omni/high_res_omni/modified/00readme_modified

This directory provides access to the Modified (Level-3) High Resolution OMNI (HRO) data set 
(at 1-min and 5-min resolution) is based on the definitive Wind plasma data set. The main difference between
the new and old OMNI data is the following - to create the new OMNI data set we used the definitive Wind/SWE 
plasma data (shifted to the Bow shock nose ) rather than the Wind/SWE shifted "KP de-spiked" plasma data. 
Now users can get more accurate plasma parameters and the "Alpha/Proton Density Ratio" parameter (the latter 
parameter is not available in the SWE_KP data).
 However, users should keep in mind that the time coverage in the new OMNI data set is decreased by 2-10% 
(depending on a year), and the latest date in the new data set is usually lags behind of the OMNI data 
that based on SWE_KP data (see hro_mod_format.txt for details.)
 
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Related data and directories:
SPDF Data and Orbits Services <https://spdf.gsfc.nasa.gov/>

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  Acknowledgement:

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

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Authorizing NASA Official:  Robert Candey, Head, SPDF, NASA Goddard Space Flight Center
                        e-mail:  Robert.M.Candey@nasa.gov
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