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

Malik, Rafidah Abd; Abdullah, Mardina; Abdullah, S.; Homam, Mariyam Jamilah

doi:10.1016/j.jastp.2015.12.013

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…On a general note, we concluded that the IRI-2016 model cannot be used as a proxy for TEC measurements for most hours of the day for the years investigated. Our result agree with those of Komjathy et al (1998), Lee and Reinisch (2006), Malik et al (2016), Bhuyan and Borah (2007), Mosert et al (2007), and Sethi et al (2010) at their respective locations. For all seasons, premidnight (18:00-23:00 LT) values of TEC are higher than post-midnight (00:00-05:00 LT) TEC values during all years.…”

Section: Discussionsupporting

confidence: 90%

“…This may be attributed to insufficient data, which are a result of the sparse distribution of GPS infrastructure in this region. Our results agree with those of Komjathy et al (1998), Lee and Reinisch (2006), and Malik et al (2016). Bhuyan and Borah (2007) reported higher IRI TEC than their measured values at almost all times (in local time) in their location.…”

Section: Methodssupporting

confidence: 91%

“…They further reported discrepancies between IRI model and their measured values during most hours of the day at the various locations of the studies. Malik et al (2016), in their studies over the Malaysian peninsula, reported higher IRI values than observed maximum useable frequency (MUF) values but similar behaviour diurnally and seasonally, with no clear trend. Akala et al (2013), in the comparison of equatorial GPS TEC observations over an African station and an American station during the minimum and ascending phases of solar cycle 24, reported that seasonal VTEC values were maximum and minimum during the March equinox and June solstice respectively during the minimum solar cycle phase at both stations.…”

Section: Introductionmentioning

confidence: 84%

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Diurnal, seasonal and solar cycle variation in total electron content and comparison with IRI-2016 model at Birnin Kebbi

Ogwala¹,

Somoye²,

Ogunmodimu³

et al. 2019

Ann. Geophys.

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Abstract. The ionosphere is the major error source for the signals of global positioning system (GPS) satellites. In the analysis of GPS measurements, ionospheric error is assumed to be somewhat of a nuisance. The error induced by the ionosphere is proportional to the number of electrons along the line of sight (LOS) from the satellite to receiver and can be determined in order to study the diurnal, seasonal, solar cycle and spatial variations in the ionosphere during quiet and disturbed conditions. In this study, we characterize the diurnal, seasonal and solar cycle variation in observed total electron content (OBS-TEC) and compare the results with the International Reference Ionosphere (IRI-2016) model. We obtained TEC from a dual-frequency GPS receiver located at Birnin Kebbi Federal Polytechnic (BKFP) in northern Nigeria (geographic location: 12.64∘ N, 4.22∘ E; 2.68∘ N dip) for the period 2011–2014. We observed differences between the diurnal variation in OBS-TEC and the IRI-2016 model for all hours of the day except during the post-midnight hours. Slight post-noon peaks in the daytime maximum and post-sunset decrease and enhancement are observed in the diurnal variation in OBS-TEC during the equinoxes. On a seasonal scale, we observed that OBS-TEC values were higher in the equinoxes than the solstices only in 2012. However, in 2011, the September equinox and December solstice recorded a higher magnitude, followed by the March equinox, and the magnitude was lowest in the June solstice. In 2013, the December solstice magnitude was highest, followed by the equinoxes, and it was lowest in the June solstice. In 2014, the March equinox and December solstice magnitudes were higher than the September equinox and June solstice magnitude. The June solstice consistently recorded the lowest values for all the years. OBS-TEC is found to increase from 2011 to 2014, thus revealing solar cycle dependence.

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Section: Discussionsupporting

confidence: 90%

Section: Methodssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 84%

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Diurnal, seasonal and solar cycle variation in total electron content and comparison with IRI-2016 model at Birnin Kebbi

Ogwala¹,

Somoye²,

Ogunmodimu³

et al. 2019

Ann. Geophys.

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“…The E layer is extending about 90-150 km. These layers can only reflect radio waves that have frequencies below 5 MHz [4]. Also, there is an unexpected layer, known as E-Sporadic (Es), with a height of 80 to 120 km [5,6].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Compatibility of IRI and ASAPS Models in Predicting the foF2 Ionospheric Parameter over the Mid Latitude Region

Ja’far

Hadi

2021

eijs

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In this research, an investigation for the compatibility of the IRI-2016 and ASAPS international models was conducted to evaluate their accuracy in predicting the ionospheric critical frequency parameter (foF2) for the years 2009 and 2014 that represent the minimum and maximum years of solar cycle 24. The calculations of the monthly average foF2 values were performed for three different selected stations distributed over the mid-latitude region. These stations are Athens - Greece (23.7o E, 37.9 o N), El Arenosillo - Spain (-6.78 o E, 37.09 o N), and Je Ju - South Korea (124.53 o E, 33.6 o N). The calculated values using the two tested models were compared with the observed foF2 datasets for each of the three selected locations. The results showed that the two tested models gave good and close results for all selected stations compared to the observed data for the studied period of time. At the minimum solar cycle 24, the ASAPS model showed in general better values than the IRI-2016 model at Athens, El Arenosillo and Je Ju stations for all tested methods. At maximum solar cycle 24, the IRI-2016 model showed higher and closer values to the observed data at Athens and El Arenosillo stations, while the ASAPS model showed better values at Je Ju station.

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“…This region is formed by the interaction of solar radiation with uncharged particles from the upper part of the Earth's atmosphere by ions and electrons (1). The ionospheric layer depends on the electronic density, so this layer is sub-divided into four layers: Layer D (60 to 90 km), E and ES layers (90 to 140 km), F1 and F2 layers (140 to 420 km) and Topside layer (420 to 1000 km) (2).…”

Section: Introductionmentioning

confidence: 99%

The Suggested Reciprocal Relationship between Maximum, Minimum and Optimum Usable Frequency Parameters Over Iraqi Zone

Hadi

Abdulkareem

2020

Baghdad Sci.J

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In this work, the relationship between the ionospheric parameters (Maximum Usable Frequency (MUF), Lowest Usable Frequency (LUF) and Optimum working Frequency (OWF)) has been studied for the ionosphere layer over the Iraqi zone. The capital Baghdad (44.42oE, 33.32oN) has been selected to represent the transmitter station and many other cities that spread over Iraqi region have represented as receiver stations. The REC533 communication model considered as one of the modern radio broadcasting version of ITU has been used to calculate the LUF parameter, while the MUF and OWF ionospheric parameters have been generated using ASAPS international communication model which represents one of the most advanced and accurate HF sky wave propagation models. The study has been conducted for the annual and seasonal time periods of the years (2009 and 2014) of the solar cycle 24. The results of the seasonal and annual tests have indicated that the interrelationship between the MUF and OWF with LUF was a fourth order polynomial equation, while the reciprocal relationship between the MUF and OWF was a simple relationship that could be represented by a linear regression equation. The reciprocal relationships between MUF, LUF and OWF parameters (present values) have shown a good fitting with the data generated using the international models (predicted values) and theoretical values calculated from the criterion equation.

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

Cited by 11 publications

References 35 publications

Diurnal, seasonal and solar cycle variation in total electron content and comparison with IRI-2016 model at Birnin Kebbi

Diurnal, seasonal and solar cycle variation in total electron content and comparison with IRI-2016 model at Birnin Kebbi

Investigating the Compatibility of IRI and ASAPS Models in Predicting the foF2 Ionospheric Parameter over the Mid Latitude Region

The Suggested Reciprocal Relationship between Maximum, Minimum and Optimum Usable Frequency Parameters Over Iraqi Zone

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