Abstract:
This paper presents variations of Ultra Low Frequency
(ULF) and Very Low Frequency (VLF) during moderate
geomagnetic storm using ground based observatories, Magnetic
Data Acquisition System (MAGDAS)/Circum-Pan Magnetic
Network (CPMN) magnetometer and Atmospheric Weather
Electromagnetic System for Observation Modeling and
Education (AWESOME) VLF receiver. In this analysis, the
recorded ULF horizontal (H)-component are extracted from
MAGDAS magnetometer at Yap Island (YAP), Federated States
of Micronesia, Davao (DAV), Philippines, and Tirunelveli (TIR),
India stations. VLF amplitude data were observed from VLF
receiver at UKM while the transmitters are located at
Katabomman (VTX), India, North West Cape (NWC), Australia
and Lualualei, Hawaii (NPM), USA. The observations of the
space weather conditions in this study are divided into two
categories: quiet day (10 April 2010) and moderate geomagnetic
storm (6 April 2010). The results show that the ULF and VLF
variations are significantly affected during geomagnetic storm
which geomagnetic activities are closely related with the solar
parameters.
