Sector Boundaries determined from daily IMF polarity using OMNIdata obtained by WWW and FTP. http://nssdc.gsfc.nasa.gov/omniweb/ow.html FTP nssdc.gsfc.nasa.gov (128.183.101.19) omni88_94: 1988:1:0 -- 1994:179:23 Xuepu Zhao Apr. 23, 1995
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