Abstract
This paper studied the variability of critical frequency in the Malaysia region. The critical frequency is obtained from radio wave reflections in the F1 and F2 layers of the ionosphere. Data was collected from the ionosonde system at Batu Pahat, Johor and experimental data from 2005 was used in the analysis. Data from two locations were then compared to data from the IRI model. The pattern of critical frequency was observed daily and monthly. Results showed that the Parit Raja location had the highest critical frequency at an average of 8.11, followed by that from the IRI model at 7.01 and Darwin station at 6.87. This could be used to define the pattern of critical frequency in the Malaysia region and further studies are needed to provide a better understanding of the mechanism.
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Acknowledgements
The authors wish to thank Universiti Kebangsaan Malaysia for funding this project, Universiti Tun Hussein Onn Malaysia for providing the experimental data and the Australian Space Weather Services World Data Centre for data download. The authors also express gratitude to University Kebangsaan Malaysia grant GGPM-2012-071 and ANGKASA grant FRGS/1/2016/TK04/UKM/02/4 for supporting this research.
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Abdullah, S., Zain, A.F.M. (2018). Analysis of Critical Frequency Measured from Ionosonde System During Low Solar Activity in Malaysia Region. In: Suparta, W., Abdullah, M., Ismail, M. (eds) Space Science and Communication for Sustainability. Springer, Singapore. https://doi.org/10.1007/978-981-10-6574-3_10
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DOI: https://doi.org/10.1007/978-981-10-6574-3_10
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