ECLAT Cluster Spacecraft Magnetotail Plasma Region Identifications (2001–2009)

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.

Year	High electron (PEACE) beta value
2001	0.2
2002	0.2
2003	0.25
2004	0.26
2005	0.37
2006	0.36
2007	0.43
2008	0.45
2009	0.26