Okayama Observatory Active Region Vector Magnetograms

The observation was made by vector magnetograph in Okayama Astrophysical Observatory. The routine operation of the Okayama magnetograph was stopped at the end of 1995.

Maps of Vector Magnetogram (gif file, 652x718 pixels)

1990	1991	1992	1993	1994	1995
		1982	1983	1984	1985	1986	1987	1988	1989

Red and blue contours indicate positive (N-polarity) and negative (S-polarity) magnetic fields along the line of sight.

Green bars indicate the strength and direction of transverse magnetic fields.

The image orientation is celestial north at the top and west to the right.

The files are named "obYYMMDDn.gif", where 'YYMMDD' is the JST(=UT+9) date of observation and 'n' is the serial number of observation.

Maps of Vector Magnetogram (fits-format data)

1990	1991	1992	1993	1994	1995
		1982	1983	1984	1985	1986	1987	1988	1989

The files are named "obYYMMDDn.fts", where 'YYMMDD' is the JST(=UT+9) date of observation and 'n' is the serial number of observation.

Current-Free Field Lines (gif file, 600x640 pixels)

1990	1991	1992	1993	1994	1995
		1982	1983	1984	1985	1986	1987	1988	1989

The files are named "olYYMMDDn.gif", where 'YYMMDD' is the JST(=UT+9) date of observation and 'n' is the serial number of observation.