Welcome to STEP magnetometer file storage at Department of Earth
and Planetary Physics, The University of Tokyo.

Our fluxgate magnetometers are or will be in operation hopefully through
STEP period at up to 20 sites as in the STATION files or in MAP files
under directories Table/ and MAPS/, respectively.

Main resources are daily files sampled with 1 minute interval from original
(*)high resolution data of 1 second sampling and are available under i
directories of "_station name"/year/m .
{Files from what stations on a specific "year month date" are available
can be searched by clicking "Search for daily files" on the www home page.}

File name: "yr_mndym.abr" (e.g. 93_0229m.erk)
             under directories "_station/yr/m" or "_station/yr/mn",
        yr=last two digits of ascii decimal year( yr="93" in case of 1993)
        mn=two digits of ascii month( mn="02" in case of February)
        dy=two digits of ascii day  ( dy="29" on 29th of a month)
        m = fix to "m" meaning one minute time resolution.
        abr= abbreviation of station name listed in MAGSTNDB file.
The written format in each file is as follows;
        The first 6 bytes at 00h 00m 00sec UT
        XlXhYlYhZlZh
        Xl=lower byte of X component, Xh=higher byte of X component
        Yl=lower byte of Y component, Yh=higher byte of Y component
        Zl=lower byte of Z component, Zh=higher byte of Z component
     The next data at 00h 01m 00s etc. follow with the same format in
     the above without gaps. Thus the total volume of each daily file
     is to be 3*2*60*24 bytes.
The scale factor to convert to physical values.
     An X component datum composed of XhXl being binary integer of 16 bits
     should be multiplied by 0.03125(=1/32) to obtain physical value
     in nT for the stations of a normalization factor of 1.0 in the
     MAGSTNDB file.
     In other word the range of AD conversion is 14 bits and the lowest
     two bits of each word has no meaning. The third bit from the LSB
     corresponds to 125 pT of minimum amplitude resolution in case of
     data specified with normalization factor of 1.0.
*) High resolution data are also relased for limited periods, '93.'94,'95.
# Stack plot charts from daily magnetograms are available in Postscript
  files at _ps0.  Refer PS_README.
# Text files such as readme, README, PS_README are UNIX format and text 
  files such as readmeWin.txt, READMEWin.txt, PS_READMEWin.txt are for 
  DOS format of the Windows 95, 98, NT.
# C program of ADDCR.C for UNIX format or ADDCRWin.C for DOS format is 
  to make an execution file, ADDCR.EXE, which transfer from a UNIX file 
  to a DOS file as
        type readme | addcr > readmeWin.txt.
# Ascii files in this CD-ROM are stored as UNIX format. If you would like 
  to watch them in DOS format, a convenient way to make the DOS format 
  file from the UNIX format file is to use "ftp" of ascii mode from the 
  UNIX machine to the DOS machine. 
# Policy: Data accessible in these directory are essentially free but please
  contact us if you need reliable information on time or scale vales.
# Please contact to hayashi@grl.s.u-tokyo.ac.jp if this information
  note would be insufficient to access and to use the data.