Comparison of maximum usable frequency (MUF) variability over Peninsular Malaysia with IRI model during the rise of solar cycle 24

R. A. Malik, Mardina Abdullah, Abdullah Sabirin, M. J. Homam

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The aim of this paper is to study maximum usable frequency (MUF) variability over Peninsular Malaysia (112.5°E, 2.5°N) which is located in the equatorial region during the rise of Solar Cycle 24 (2009-2011). The MUF Test data was obtained from high frequency (HF) transmission tests that were conducted from April 2009 to September 2011. Relative variability VR was used to compute the relative variability of MUF. Variability of diurnal, seasonal and sunspot effect on MUF of test was compared to International Reference Ionosphere (IRI) version of 2012. The results show that: (a) MUF from the IRI model is higher than the MUF Test but the magnitude for the MUF Test and IRI are similar; (b) from the diurnal analysis, MUF is more vulnerable to variability during the nighttime than the daytime where the variability range for MUF Test and IRI during daytime is 4-12% compared to the nighttime range of 10-30%; (c) seasonal variability for MUF Test in 2011 indicates no clear trend for all seasons, and the seasonal and monthly variability for both MUF VR in 2011 is lower compared to 2009 and 2010; and (d) when sunspot number increases, MUF VR decreases. This result complements the variability in the equatorial and low latitude regions in that when solar activity increases, variability decreases.

Original languageEnglish
Pages (from-to)87-92
Number of pages6
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume138-139
DOIs
Publication statusPublished - 1 Feb 2016

Fingerprint

maximum usable frequency
Malaysia
solar cycles
solar cycle
ionospheres
ionosphere
virtual reality
sunspot
daytime
sunspots
comparison
test
solar activity
equatorial regions

Keywords

  • High frequency (HF) communications
  • Maximum usable frequency (MUF)
  • Relative variability VR

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science
  • Atmospheric Science

Cite this

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title = "Comparison of maximum usable frequency (MUF) variability over Peninsular Malaysia with IRI model during the rise of solar cycle 24",
abstract = "The aim of this paper is to study maximum usable frequency (MUF) variability over Peninsular Malaysia (112.5°E, 2.5°N) which is located in the equatorial region during the rise of Solar Cycle 24 (2009-2011). The MUF Test data was obtained from high frequency (HF) transmission tests that were conducted from April 2009 to September 2011. Relative variability VR was used to compute the relative variability of MUF. Variability of diurnal, seasonal and sunspot effect on MUF of test was compared to International Reference Ionosphere (IRI) version of 2012. The results show that: (a) MUF from the IRI model is higher than the MUF Test but the magnitude for the MUF Test and IRI are similar; (b) from the diurnal analysis, MUF is more vulnerable to variability during the nighttime than the daytime where the variability range for MUF Test and IRI during daytime is 4-12{\%} compared to the nighttime range of 10-30{\%}; (c) seasonal variability for MUF Test in 2011 indicates no clear trend for all seasons, and the seasonal and monthly variability for both MUF VR in 2011 is lower compared to 2009 and 2010; and (d) when sunspot number increases, MUF VR decreases. This result complements the variability in the equatorial and low latitude regions in that when solar activity increases, variability decreases.",
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AU - Homam, M. J.

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