RUSSIAN JOURNAL OF EARTH SCIENCES, VOL. 17, ES5001, doi:10.2205/2017ES000609, 2017
Adhikari, Binod, Nirakar Sapkota, Binod Bhattarai, Roshan Kumar Mishra, Sudarshan Bohora, Narayan P. Chapagain
We observed the interplanetary datasets, polar cap potential (PCV) and polar cap index (PCI) during geomagnetically quiet period and three different types of High Intensity Long Duration Continuous AE Activities (HILDCAAs). On each event, we examine the interplanetary electric field (Ey), polar cap potential (PCV), polar cap index (PCI) and westward auroral electrojet (AL) indices. We found little perturbations in Ey during the quiet event, but significant perturbations during HILDCAAs. In particular, non-storm HILDCAA showed more perturbations in Ey compared to the other two HILDCAAs. Due to sporadic energy pumping to the magnetosphere, Ey was perturbed even after the non-storm HILDCAA. From CWT analysis, we found highest power intensities to have periodicity of more than 190 minutes for quiet event, non-storm HILDCAA and CIR-preceded HILDCAA. However, the magnitude of the higher power intensity was different: 11 units for PCV and PCI in quiet, 9 and 14 units respectively for PCV and PCI in non-storm HILDCAA, 15 units for PCV and PCI in CIR-preceded HILDCAA, and 23 and 14 units for PCV and PCI during ICME-preceded HILDCAA. PCV and PCI clearly showed that higher power intensities are found in higher timescales. In contrast, lower and middle power intensities are found across all timescales.
Accepted October 26, 2017.
Citation: Binod Adhikari, Nirakar Sapkota, Binod Bhattarai, Roshan Kumar Mishra, Sudarshan Bohora, Narayan P. Chapagain (2017), Study of interplanetary parameters, polar cap potential, and polar cap index during quiet event and high intensity long duration continuous AE activities (hildcaas), Russ. J. Earth Sci., 17, ES5001, doi:10.2205/2017ES000609.
Copyright 2017 by the Geophysical Center RAS.