Notations

SA variables

units

B

IMF Magnitude

nT

T

Proton temperature

B

D

Proton density

n/cc

V

Plasma (Flow) speed

km/s

P

Flow pressure

nPa

EY

Earth’s electric field east-west component

mV/m

SSN

Sunspot number

n

DST

Disturbance storm time index

nT

PCI

Polar cap index