ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/omni/00readme.txt

This directory provides access to the hourly-resolution OMNI 2 data set
and to daily and 27-day averaged versions thereof, and to a high resolution
(1-min) OMNI (HRO) data set, to a 5-min version thereof, and to related
1-min spacecraft-specific data sets.

The OMNI data sets characterize the state of the solar wind near the 
magnetosphere.  All versions have magnetic field and plasma data from
each of multiple spacecraft, where the plasma densities and temperatures
have been cross-normalized.  OMNI 2 also has energetic particle fluxes
and geomagnetic and solar activity indices.

At this writing, OMNI 2 spanned 1963-2006, and HRO spanned 1995-2006.

The data in the high resolution data sets have been shifted from their
spacecraft locations of observation to the bow shock nose at 15-s resolution.  
The ~L1 data (ISEE 3, Wind, ACE) in OMNI 2 were shifted with simpler 
algorithms to Earth at 1-5 min resolution.  In both cases new 1-min or 1-hr
averages were computed at the "targets."

The content and building of hourly OMNI 2 are extensively described at 
ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/omni/omni2.text,
http://omniweb.gsfc.nasa.gov/html/ow_data.html,
http://omniweb.gsfc.nasa.gov/html/omni2_doc.html
(The first two of these are similar, while the third is much more detailed.)

The content and building of high resolution OMNI (HRO) and of related 
spacecraft-specific data sets, used in building HRO and also made accessible
via this directory, are extensively described at 
ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/omni/high_res_omni/hro.txt,
http://omniweb.gsfc.nasa.gov/html/HROdocum.html

In addition to ftp accessibility, OMNI 2 data are accessible with multiple
functionalities from http://omniweb.gsfc.nasa.gov/, and HRO and related 
spacecraft-specific data are accessible with multiple functionalities from
http://omniweb.gsfc.nasa.gov/omsc_min.html

This directory consists of subdirectories and files of data and/or documentation.  
The subdirectories lead to HRO and related spacecraft-specific data sets 
and to the version of OMNI that was superseded by OMNI 2 in 2003.

The data and documentation files include:
1. Annual OMNI 2 data files in standard OMNI ASCII format
(e.g., omni2_1963.dat)
2. Annual OMNI 2 data files in "COHOWeb" ASCII format and content
(e.g., omni_m1963.dat)
3. The hourly resolution OMNI 2 CDF file underlying the OMNIWeb interface
(omni2.cdf)
4. All-time daily and 27-day averaged versions of OMNI 2.
(omni_01_av.dat and omni_27_av.dat)
5. This readme file (00readme.txt)
6. A more detailed documentation file (omni2.text)
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Related data and directories:
SPDF Data and Orbits Services <http://spdf.gsfc.nasa.gov/>
NSSDC Master Catalog <http://nssdc.gsfc.nasa.gov/nmc/sc-query.html>



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  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)
              
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SPDF/NSSDC Contact: <natasha@mail630.gsfc.nasa.gov>
<request@mail630.gsfc.nasa.gov>  
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Authorizing NASA Official: Dr. R.E. McGuire, Head, SPDF, NASA Goddard Space Flight Center
                        301-286-7794, e-mail:  Robert.E.McGuire@nasa.gov