Space Climate
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Table 1.

Summary of plasma and magnetic parameters associated with studied ICMEs. Y = yes, ‘–’ = not observed.

Characteristics 20 November 2003 ICME 4 August 2010 ICME
Tp, Te, decrease Y Y
Anisotropy Tp ≥1 ≥1
Anisotropy Te ≥1 ≤1
B increase Y Y
Proton, electron, ion and helium density increase Y Y
He++/H+ and He+/He++ abundance ratio increase Y Y
He+ presence Y Y
Decrease in carbon and oxygen charge states Y Y
Decrease in iron charge states Y
Presence of trailing plasma outside MC Y Y
Filament plasma position in MC Behind MC axis Behind MC axis
Filament plasma location in MC Rear Rear
Depression in RMS deviations of Vth, V, Tp and B Y Y
Radial extension of filament plasma 0.07 AU 0.19 AU
Ratio of radial extension of filament plasma and MC 0.36 0.79
Decrease in thermal velocities Y Y
Freezed-in temperature depressions Y Y

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