Characterization of low frequency variations due to space weather conditions at low latitude region / Siti Noor Aisyah Ahmad

The process of interaction between space weather conditions and Earth's magnetic field is one of the factors that lead to the variation effect of both ultra-low frequency (ULF) and very low frequency (VLF) waves which can be observed in space and on the ground. These variations are recorded in...

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Main Author:	Ahmad, Siti Noor Aisyah
Format:	Thesis
Language:	English
Published:	2018
Subjects:	Climatology and weather
Online Access:	https://ir.uitm.edu.my/id/eprint/37186/1/37186.pdf
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id	my-uitm-ir.37186
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spelling	my-uitm-ir.371862022-11-01T03:52:13Z Characterization of low frequency variations due to space weather conditions at low latitude region / Siti Noor Aisyah Ahmad 2018 Ahmad, Siti Noor Aisyah Climatology and weather The process of interaction between space weather conditions and Earth's magnetic field is one of the factors that lead to the variation effect of both ultra-low frequency (ULF) and very low frequency (VLF) waves which can be observed in space and on the ground. These variations are recorded in the frequency range of ULF and VLF with 1.7 - 500 mHz and 3- 30 kHz respectively. Study on both ULF and VLF at low latitude region is still not well established, due to the lack of understanding in ULF and VLF. Therefore, this study investigates the characteristics of both ULF and VLF due to space electromagnetic perturbations at low latitude region. In the first part of this study, solar wind (SW) parameters were analyzed during a maximum solar cycle of 24. Solar wind (SW) parameters that considered in this analysis are solar wind speed, Vsw (km/s), solar wind input energy,e (ergs/s) and solar wind dynamic pressure, Pdyn (nPa). The observation period covers on year 2012 (for ULF) and 2013 (for VLF). In the second part, the recorded ULF magnetic pulsations are extracted from Magnetic Data Acquisition System (MAGDAS) magnetometer was observed at low latitude stations; Langkawi (LKW), Malaysia and Tirunelveli (TIR), India. In the third part, VLF data were investigated from Atmospheric Weather Electromagnetic System for Observation Modeling and Education (AWESOME) VLF receiver located at Universiti Kebangsaan Malaysia (UKM), Malaysia, which received the signals from Katabonunan (VTX), India and Lualuaiei (NPM), USA. The results of analysis show that Pc5 ULF pulsations have a positive correlation with the SW parameters. While for VLF variation, the result shows weak correlation with the SW parameters. To connect the solar wind with ULF and VLF variations, there are some possibilities that vary on both variations. The main source which effects on the Pc5 ULF pulsation is from coronal mass ejection (CME) and coronal hole (CH) which can produce high-speed solar wind (HSSW) traveling to the Earth. Both CME and CH influenced the variations of the Earth's magnetic field at all latitudes. However, for VLF, the variation is directly not affected by SW parameter due to ionospheric absorption at D-layer of ionosphere. 2018 Thesis https://ir.uitm.edu.my/id/eprint/37186/ https://ir.uitm.edu.my/id/eprint/37186/1/37186.pdf text en public masters Universiti Teknologi MARA (UiTM) Faculty of Electrical Engineering Jusoh, Mohamad Huzaimy
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Jusoh, Mohamad Huzaimy
topic	Climatology and weather
spellingShingle	Climatology and weather Ahmad, Siti Noor Aisyah Characterization of low frequency variations due to space weather conditions at low latitude region / Siti Noor Aisyah Ahmad
description	The process of interaction between space weather conditions and Earth's magnetic field is one of the factors that lead to the variation effect of both ultra-low frequency (ULF) and very low frequency (VLF) waves which can be observed in space and on the ground. These variations are recorded in the frequency range of ULF and VLF with 1.7 - 500 mHz and 3- 30 kHz respectively. Study on both ULF and VLF at low latitude region is still not well established, due to the lack of understanding in ULF and VLF. Therefore, this study investigates the characteristics of both ULF and VLF due to space electromagnetic perturbations at low latitude region. In the first part of this study, solar wind (SW) parameters were analyzed during a maximum solar cycle of 24. Solar wind (SW) parameters that considered in this analysis are solar wind speed, Vsw (km/s), solar wind input energy,e (ergs/s) and solar wind dynamic pressure, Pdyn (nPa). The observation period covers on year 2012 (for ULF) and 2013 (for VLF). In the second part, the recorded ULF magnetic pulsations are extracted from Magnetic Data Acquisition System (MAGDAS) magnetometer was observed at low latitude stations; Langkawi (LKW), Malaysia and Tirunelveli (TIR), India. In the third part, VLF data were investigated from Atmospheric Weather Electromagnetic System for Observation Modeling and Education (AWESOME) VLF receiver located at Universiti Kebangsaan Malaysia (UKM), Malaysia, which received the signals from Katabonunan (VTX), India and Lualuaiei (NPM), USA. The results of analysis show that Pc5 ULF pulsations have a positive correlation with the SW parameters. While for VLF variation, the result shows weak correlation with the SW parameters. To connect the solar wind with ULF and VLF variations, there are some possibilities that vary on both variations. The main source which effects on the Pc5 ULF pulsation is from coronal mass ejection (CME) and coronal hole (CH) which can produce high-speed solar wind (HSSW) traveling to the Earth. Both CME and CH influenced the variations of the Earth's magnetic field at all latitudes. However, for VLF, the variation is directly not affected by SW parameter due to ionospheric absorption at D-layer of ionosphere.
format	Thesis
qualification_level	Master's degree
author	Ahmad, Siti Noor Aisyah
author_facet	Ahmad, Siti Noor Aisyah
author_sort	Ahmad, Siti Noor Aisyah
title	Characterization of low frequency variations due to space weather conditions at low latitude region / Siti Noor Aisyah Ahmad
title_short	Characterization of low frequency variations due to space weather conditions at low latitude region / Siti Noor Aisyah Ahmad
title_full	Characterization of low frequency variations due to space weather conditions at low latitude region / Siti Noor Aisyah Ahmad
title_fullStr	Characterization of low frequency variations due to space weather conditions at low latitude region / Siti Noor Aisyah Ahmad
title_full_unstemmed	Characterization of low frequency variations due to space weather conditions at low latitude region / Siti Noor Aisyah Ahmad
title_sort	characterization of low frequency variations due to space weather conditions at low latitude region / siti noor aisyah ahmad
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	Faculty of Electrical Engineering
publishDate	2018
url	https://ir.uitm.edu.my/id/eprint/37186/1/37186.pdf
_version_	1783734396708192256

Characterization of low frequency variations due to space weather conditions at low latitude region / Siti Noor Aisyah Ahmad

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