Observations of Pi 2 pulsations in Malaysia

Mohd Zain, Ahmad Faizal and Othman , Mohd Khair Observations of Pi 2 pulsations in Malaysia. In: International Conference on Science and Technology (ICSTIE '06), 8-9 December 2006, Penang.

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Abstract

Geomagnetic pulsations, also know as ULF (ultra low frequency) waves, are variations in the geomagnetic field on time scales of 0.1 to 600 seconds. These pulsations are the most visible sign of magnetic activity external to the Earth at low and middle latitudes. A ground base data recorded at the newly developed observatory station (1° 51.3' N, 103° 5.1' E) Parit Raja, Batu Pahat, was used to study the pulsations. The data were recorded using a fluxgate magnetometer with 1 s sampling rate. Eighty-five Pi 2 pulsations events were detected (Kp ≤ +2) during the months of June to December 2005. The pulsation events were apparent in the H-component. The Pi 2 pulsations were frequently observed around local midnight (2100 -0300 LT) and during the day (0600-1500 LT). The number of events decreases during the period of 1500-1800 LT. The ratio of the number of Pi 2 pulsations occurring on the dayside to the night side was about 77%. The frequency range of the Pi 2 wave is 2 – 25 mHz with dominant frequency range of 6 to 15 mHz. The dynamic power spectra was used to calculate the peak power at the same frequencies and spectrogram analysis was used to determine the power across the time.

Item Type:Conference or Workshop Item (Paper)
Subjects:Q Science > QC Physics
ID Code:2797
Deposited By:Normajihan Abd. Rahman
Deposited On:08 Nov 2012 14:25
Last Modified:08 Nov 2012 14:25

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