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Observations of magnetic storms at the newly developed magnetic observatory in Malaysia

Mohd Zain, Ahmad Faizal and Othman , Mohd Khair Observations of magnetic storms at the newly developed magnetic observatory in Malaysia. In: International Conference on Science and Technology (ICSTIE '06), 8-9 December 2006, Penang.

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Abstract

The magnetic storm is a worldwide disturbance of the Earth’s magnetic field when the plasma bursts emitted from solar flares cause the solar wind to behave erratically. When the plasma comes in contact with the geomagnetic field, it causes it to become ore compresses, and raises the field intensity on the surface of the Earth. This phenomenon was detected using a fluxgate magnetometer with 1 s sampling rate at a ground base newly developed magnetic observatory station (1° 51.3' N, 103° 5.1' E) in Parit Raja, Batu Pahat, Johor, Malaysia. One minute digital gaussian filter was applied to the data (HDZ) to reduce the effect of aliasing on the one minute data. This data was analyzed during the storm periods to investigate the characteristic of the local magnetic field components dH, dD and dZ during the events. The occurrence of the magnetic storm events are referred to the Dst index produced by the World Data Center. Nine magnetic storms were observed during seven month observations between June to December 2005 with Dst index range from -70 to -219. The most intense magnetic storm observed occurred on 24 August 2005 with Dst = - 216 and Kp=9. During this storm, the sudden commencement (SC) in the form of sharp increase of the H-component occurred during the initial phase at 1500 LT. Then, the main phase occurred when the H-component decreases for a long period with the larger amplitude (~ 750 nT) than the initial phase at 2000 Local Time (LT). Finally the recovery phase lasted for 3 days after the storm until 26 August 2005. Calculation of the dynamic power spectrum and spectrogram were used to determine the peak power at the same frequencies between (18 to 22 mHz) and (40 to 50 mHz ) and cross-power at the time range at 1200 to 2100 LT.

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science > QC Physics
Depositing User: Normajihan Abd. Rahman
Date Deposited: 08 Nov 2012 06:27
Last Modified: 08 Nov 2012 06:27
URI: http://eprints.uthm.edu.my/id/eprint/2798
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