Global geomagnetically induced currents during quiet geomagnetic activity on 23 December 2014 / Farah Adilah Mohd. Kasran, Mohamad Huzaimy Jusoh and Siti Amalina Enche Ab Rahim

In this study, the global GIC activity was
investigated during the sudden impulse (SI) event associated
with coronal mass ejection (CME) passage on 23 December 2014
in order to assess the GIC risks at different latitudes even
without any strong geomagnetic activity. Firstly, the solar wind
parameters, namely, solar wind speed (Vsw) and solar wind
dynamic pressure (Pdyn), interplanetary magnetic field (IMF) Bz
component, the auroral electrojet (AU and AL index) and SYM
H index that represents the ring current are thoroughly studied
for two days, during the SI event and after the event. Then, the
temporal variation of SYM H was extracted to estimate the level
of Earth’s magnetospheric compression associated with the
interplanetary shock. The global latitudinal temporal changes of
magnetic field H-component during the SI event were
statistically analyzed to observe its impact to the global GIC.
The same method of analysis was then further examined in
consideration of local time (LT) and the SI event period to
identify the time corresponded to the strong impact of GIC
activity. The results revealed an interesting finding where a
comparable equatorial GIC activity with GIC activity in high
latitude region occurred during the arrival of interplanetary
shock due to the SI event. Besides, the result also gave the idea
on important timing for large GIC prediction in particular area.