Fig. 1From: Distribution of equatorial Alfvén velocity in the magnetosphere: a statistical analysis of THEMIS observationsa The orbit of THEMIS-A projected onto the solar magnetic x–y plane for the 24-h interval on 25 December 2012. b, c The magnetic field intensity and electron density as a function of L for the interval of 0700–1500 UT. d Equatorial Alfvén velocity using Eq. (1) with m = 1 amu (blue) and m = 3 amu (red) near the magnetic equatorBack to article page