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• W2047983411 abstract "This paper aims to study the influence of sunspot number on High Frequency (HF) radio communications in Peninsular Malaysia for the years 2009 to 2011. Sunspots, which are a natural phenomenon that occurs due to magnetic activities on the Sun's surface, can be counted using smoothed sunspot number (SSN). HF signal propagates through the ionosphere where the ionospheric properties have been ionized by flares and prominences from sunspot number. This has significant effect on the stability of the ionosphere, resulting in the frequencies that can be used for HF communications to vary depending on the time of day, season, year and the 11-year solar cycle. This study was carried out during a period when the sunspot values rose from a low level in 2009 to a much higher level in 2011, making it suitable to observe the influence of sunspot number values on the HF frequencies employed. Maximum Usable Frequency (MUF) was determined based on HF transmission tests that were conducted from April 2009 to September 2011. It was observed that as the SSN values increase, the range of the operating HF frequencies and the numbers of frequencies that can be used also increase. This will, therefore, affect the median frequency that can be used for daily and monthly HF communications." @default.
• W2047983411 created "2016-06-24" @default.
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• W2047983411 date "2014-12-01" @default.
• W2047983411 modified "2023-09-26" @default.
• W2047983411 title "The influence of sunspot number on high frequency radio propagation" @default.
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• W2047983411 doi "https://doi.org/10.1109/apace.2014.7043753" @default.
• W2047983411 hasPublicationYear "2014" @default.
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