ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/geotail/mag_sw_15s/00readme file

Geotail 15sec solar wind magnetic field data 

This directory provides annual ASCII files of 15-sec-averaged, solar-wind-only,
Geotail/MGF magnetic field data.  This data set was created at GSFC/SPDF
from 3-sec MGF data as part of an effort to create 1-min field-plasma-merged
Geotail data as shifted to the Earth's bow shock nose.  Despiking and the
separation of the solar wind data from the time-continuous data stream are
described at

ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/geotail/sw_min_merged/00readme file

This 15-s MGF data set is accessible with graphical display and parameter
and time subsetting capabilities through the FTPBrowser interface at

http://ftpbrowser.gsfc.nasa.gov/geotail_mag15s.html

The contents and format of the data set's records are:

Wd Format   Fill values      Parameters        Units, Comments
 1  I4      9999             Year              1995,1996,...
 2  I4      999              Doy               1-366
 3  I3      99               Hour              0-23
 4  I3      99               Minute            0-59
 5  I3      99               Second            0-59
 6  I3      99            Nm, Number of mag field points
 7  F8.2    9999.99       Field Magnitude Average        <|B|>, nT
 8  F8.2    9999.99       Bx GSE                            nT 
 9  F8.2    9999.99       By GSE                            nT 
10  F8.2    9999.99       Bz GSE                            nT
11  F8.2    9999.99          X, GSE            S/C position component, Re
12  F8.2    9999.99          Y, GSE             "
13  F8.2    9999.99          Z, GSE             "


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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>

NSSDC Contact: Natalia Papitashvili <Natalia.E.Papitashvili.1@gsfc.nasa.gov>,
 <request@mail630.gsfc.nasa.gov>

Please acknowledge NASA's National Space Science Data Center and
 Space Physics Data Facility, and the Principal Investigators
Dr. Tsugunobu Nagai (Tokyo Institute of Technology, U. Tokyo)
and Dr. Bill Paterson (Hampton U.) 

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