Table 1: Wilcox [34] suggested that the interplanetary field (IMF) showed a monopole-like behavior, when the IMF, or its proxy, showed time intervals when it was predominantly pointed towards or away from the Sun for a good fraction of a solar rotation. Svalgaard [41] shows the following time periods with unipolar patterns.

YearmonthdayBartels no.IMF sign: away +, towards X, mixed polarity *

19540613 1656 X+++++++XXX+++++++++X++++++
19540710 1657 +X++++XXX+++++++++++++++X++
19540806 1658 +++++++++X+++++++++++++++++
19540902 1659 +*+++++++++++++++++++++++++
19540929 1660 +++++++++++++XXX+X++++++*++

19650522 1804 X*XXX+++++XXXXXXXXX++++XXX+
19650618 1805 +XX+XXX+++XXXXXXXX++XXXXXXX
19650715 1806 XXX+XXXX++++XXXXXXXXXXXXXX+
19650811 1807 XXXXXXXX++++*XXXXXXXXXXXXXX

19670521 1831 X+X++XXX+**XXXX+XXXXXXXXXXX
19670617 1832 XXX+XXX++XXXXX++XXXX++++XXX
19670714 1833 XXXXXXXXXXXXXXXXXX+*X+++++X
19670810 1834 XXXXXXXXXXXXXXXXXXXX*++++++
19670906 1835 +XXXXXXXXXXXXXXXX+*XX++++++
19671003 1836 XXXXXX+*XXXXXXXXXXXXX*+++XX
19671030 1837 +XXXX+++XXXXX*XXXXXXXX++*++

19870118 2097 ++++++++++++++++++++++++*++
19870214 2098 +++++++++++++++++++++++++++
19870313 2099 +++++++++++X+++++++X+*+++++
19870409 2100 ++++++++++++++++++*++*+++++

19951229 2218 ++*XXXX*+*XXXXXXXXXXX*+X+++
19960125 2219 XXXXXXXXX*XX*X*XXXXXXX+*+XX
19960221 2220 *XXXX*X*XX*XXXX++XXXXXXX+X*
19960319 2221 *XXXXXXX*XX**XX+X*+++XXXXXX
19960415 2222 XXXXXXXXXXX+++++X+X+XXXX+++
19960512 2223 +XXXXX+XXXX++XX*+*XXXXX*+++

19970206 2233 **++X++XXXXXX**XXXXX+XXXXXX
19970305 2234 +++++++XXXXXXX+++XXX*XXXXXX
19970401 2235 +XXXXXXXXXX++++XXXXXXXX*X*X
19970428 2236 ++XXXXXXXXXXX+++X+XXX*+++XX

20100625 2414 *XXXXXXXXXXXX*+++XX*++++XX+
20100722 2415 +XXXXXXXXXXXXXXX*X++++XX+++
20100818 2416 ++*XXXXXXXXXXXXXXXX+++*XXX*
20100914 2417 +*XXX*X*XXXXXXXXXXXXX+++XX*