Welcome to the STEP Magnetometer File Storage Center for the Department of 
Earth and Planetary Science, the University of Tokyo.

  Our fluxgate magnetometers were operated through the STEP period at up to 20 
sites listed in the STATION files or located in MAP files under directories of 
Tables/ and MAPS/, respectively.

  Main resources here are daily files sampled over one-minute intervals 
produced from original (*)high resolution data of one-second rate. Files from a 
station of a year are found under a ¡Èm¡É-folder at the end of directory 
chains, such as ¡È_eureka/92/m/¡É. Also quick-look charts of stacked daily 
magnetograms are provide by gif files under a directory ¡È_QL(gif)/ ¡É. (*)You 
can search and download the high resolution data directly from our web pages at 
¡Èhttp://hpep3.eps.s.u-tokyo.ac.jp¡É.
  File name: ¡É[yy]_[mm][dd]m.[abr]¡É (e.g., 96_0229m.erk)
      Under directories ¡È_station/yy/m/¡É (_eureka/96/m/)
      yy=last two digits of ascii decimal year( yy=¡É93¡É for 1993 and ¡È00¡É 
for 2000)
      mm=two digits of the ascii month (mm=¡É02¡É for February)
      dd=two digits of ascii day (dd=¡É29¡É for the 29th of the month)
       m=fix to ¡Èm¡É meaning a one-minute time resolution.
      abr=abbreviation of the station name listed in the MAGSTNDB file.

All files are written by two-bytes integer in which the lower byte leads.
Data format:
The written format of 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 Xomponent
   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 succeeding data at 00h 01m 00s etc. follow with the same format as 
above, without gaps. Thus, the total volume of each daily file must be 
3*2*60*24=8.64k bytes.

The scale factor converting raw integer values to physical values.
   An X component datum of a binary integer value in 16bit length should be 
multiplied by 0.03125(=1/32) to obtain the physical value in nT for stations 
listed with a normalization factor of 1.0 in the MAGSTNDB file. In other word, 
A to D conversion is made in a dynamic rage of 14 bits. The third bit from the 
LSB corresponds to 125 pT of the minimum resolution of data value when a data 
set is specified with a normalization factor of 1.0. Thus the lowest two bits 
of each word have no information.

Policy: The data accessible in this CD-ROM is essentially free, but please 
contact us if you need information on time or scale values.

Quick look chart of dailly stacked plots:

  Daily plots of stacked magnetograms are stored under the directory, 
¡È_QL(gif)/ ¡É.
  Horizonal components are plotted on those of corrected geomagnetic coordinate 
converted from ordinary H-D coordinate. The values of the rotation angle at 
each site which were selected for the conversion of coordinate system are found 
in the MAGSTNDB file. In the quick look plots the screening of data is limited, 
and some data were plotted without correcting time offsets. We hope that one 
should check time offsets by comparing magnetograms in close proximity to one 
another. 

Appendices
1.	Conversion tool from binary files to ascii files are found in the 
directory tools. This tool also makes conversion of horizontal components to 
those in the corrected geomagnetic coordinate from the original H-D coordinate. 
Rotation angle can be referred in the attached file of ¡Èfxstndb.txt¡É but 
those should be regarded as preliminary values given for conveniences of some 
users. 
i)	Compilation of b2apfout1.c (Unix operating system is assumed here but 
one can modify it for working under MSDOS or Windows.)
ii)	Copy executable b2apfout1 and b2a-ls-stn together with a parameter 
files-files (fxstndb.txt) into a directory where binary data files are stored.
iii)	Key in ¡Èb2a-ls-stn file*¡É and practice it. Here one can use a file 
name with wild card such as ¡È9?_0?*m.???¡É.
iv)	You will have ascii data files a94_0102m.cbb etc..
v)	One can modify the source file parameter as he like.
2.	A program to generate 3 components plots for a selected station in 
Postscipt pages. In default successive three days are plotted in a page. 
Programs for Unix and PC( MSDOS or Windows) are packed in ¡Èps-mk-unix.zip¡É 
and ¡Èplots-ps-dos.gz¡É, respectively. A pre-complied program( *.exe) is also 
packed in the latter. These tools work well in our computers. But we should 
mention that they are just samples and that some modifications of source files 
will be required before they will work.

Acknowledgments:
   We are deeply indebted to people and organizations where our magnetometers 
were installed and have been maintained by their great hospitality. Site names 
and contributors at each location are listed in Tabel/stn2002.asc. They are 
colleagues of universities, volunteers at home, those of government, 
semi-government and private organizations in Canada, U.S.A., Greenland, Norway, 
Russia, and Vietnam. 
   Establishment of the program and continuation of data collection have been 
supported by the Science Division, Ministry of Education, Science, and Culture, 
Japan (Special fund for STEP, grant-in-aid 03041025, grant-in-aid 02504002, 
05051057, and grant-in-aid 07554077).
  Support for the production of S-RAMP Database was provided by grants in aid 
from the Japan Society for Promotion of Science (JSPS).

CONTACTS:
Principal Investigator:
   Dr. Kanji Hayashi
   Department of Earth and Planetary Science
   Graduate School of Science
   The University of Tokyo
   7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
¡¡ Phone: +81-3-5841-4587, Fax: +81-3-841-8321
   E-mail:hayashi@eps.s.u-tokyo.ac.jp