3.2.3 X-component magnetogram at Athabasca
We also perform the superposed epoch analysis for the X-component
magnetogram at Athabasca, shown in Figure 7. The X-component magnetogram
at Athabasca began to decrease ~1 hr before the
detachment of red arc and red+green arc. For STEVE, X-component
magnetogram at Athabasca showed a hump of slight (~10
nT) enhancement ~30-minutes prior to the detachment
followed by a decrease. Such feature is not observed for red arc and
red+green arc. The maximum decrease prior to detachment was
~40 nT for STEVE and red+green arc and 20 nT for red
arc.