Table 4: Values of electron beta used in determination of high beta OPS regions/low beta IPS regions, when the PEACE instrument is used in region identification, that is, the ratio of ion to electron beta at ion beta 1 for each tail season.

YearHigh electron (PEACE) beta value

20010.2
20020.2
20030.25
20040.26
20050.37
20060.36
20070.43
20080.45
20090.26