Investigation of the Different Models Performance for Evaluating the Disturbance in the Ionosphere

Difar, Kareem Abdulameer; Ali, Jalal Hussein Abd; Al-Behadili, Amer Abbood; Kareem, Maysam Kadhim; Deaim, Ali Raad; Hamadani, Mustafa Khaleel

doi:10.1109/ecai46879.2019.9042149

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…The ionosphere, one of the upper atmosphere's layers, extends from (80 to 1000) km and higher [1]. When solar radiation interacts with chemical elements in the atmosphere, the electrically neutral layer of the ionosphere becomes ionized.…”

Section: Introductionmentioning

confidence: 99%

Examining the Seasonal Correlations Among Different Ionospheric Indices During Solar Cycle Twenty-Four

Ezzat,

Hadi

2024

Iraqi Journal of Science

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The present work aimed to examine the nature and degree of the cross-correlations among three different ionospheric indices: these are Optimum Working Frequency (OWF), Highest Probable Frequency (HPF), and Best Usable Frequency (BUF). VOCAP and ASASPS models were adopted to determine the datasets of the selected ionospheric indices. The determination was made for different transceiver stations that provide certain HF connection links during the minimum and maximum years of solar cycle 24, 2009 and 2014, respectively. Matlab program was implemented to produce the geodesic parameters for the selected transceiver stations. The determination was made for different path lengths (500, 1000, 1500, and 2000) Km and bearings (0o, 45o, 90o ........ 315o). Different correlation methods were used to examine the best determination coefficient values between the tested parameters. A third-order polynomial equation was set as the best correlation method that gave a better description for the correlation among the tested parameters. The proposed mathematical correlation equations were used to predict the seasonal values of the (HPF, OWF and BUF) parameters. The proposed equations were verified by comparing their values with the observed datasets during the study years. Also, the predicted values were tested using different statistical methods, which gave good results for all tested cases. يهدف العمل الحالي إلى دراسة طبيعة ودرجة الترابط بين ثلاثة مؤشرات آيونوسفيرية مختلفة وهي (HPF,OWF and BUF), تم استخدام نماذج VOCAP و ASASPS لحساب قيم البيانات للمؤشرات الآيونوسفيرية المختارة. اجريت الحسابات لمحطات الإرسال / الاستقبال المختلفة التي توفر روابط اتصال عالية التردد خلال سنوات الصغرى والعظمى للدورة الشمسية 24 (2009 و 2014) على التوالي. تم تنفيذ برنامج Matlab لايجاد قيم المعلمات الجيوديسية لمحطات الإرسال / الاستلام لأطوال مسافات مختلفة (500، 1000، 1500 و 2000) كم واتجاهات مختلفة(0o, 45o, 90o ........ 315o). تم تطبيق طرق ارتباطية مختلفة لاختبار افضلها بين المعاملات المختبرة . تم اقتراح معادلات رياضية متعددة الحدود (الدرجة الثالثة) كأفضل طريقة تصف القيم الارتباطية بين المعاملات المحددة لغرض الدراسة. تمكنت المعادلات المقترحة من التنبؤ بالقيم الموسمية للمؤشرات ((HPF و(OWF) و (BUF).و تم التحقق منها من خلال مقارنتها مع قيم المعلمات المرصودة خلال سنوات الدراسة . كما تم اختبار القيم المتوقعة باستخدام طرق إحصائية مختلفة والتي قدمت نتائج جيدة لجميع الحالات المختبرة

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Section: Introductionmentioning

confidence: 99%

Examining the Seasonal Correlations Among Different Ionospheric Indices During Solar Cycle Twenty-Four

Ezzat,

Hadi

2024

Iraqi Journal of Science

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“…Space physics is an integral part of space weather science and it has massive consequences for understanding the environment and for communications and satellite operations. As ionosphere reflects the VLF waves, it may be used as a prospective tool for studying the D-region ionosphere which plays an important role in the propagation of radio waves [4] [5]. VLF can be used as a D-layer probe because this region is lower than the satellites location and higher than atmospheric balloons.…”

Section: Introductionmentioning

confidence: 99%

X-Ray Solar Flares Observed and Detected by The New Very-Low-Frequency Receiver in Nasiriyah City, South of Iraq

Allawi¹,

Jasim²,

Difar³

2021

Al-Mustansiriyah J. Sci.

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A receiver station was installed at Nasiriyah (Dhi Qar University - Faculty of Sciences) to receive very low frequency (VLF) radio signals from transmitters around the world. VLF waves are excellent probes of the sudden ionospheric disturbance (SID); they detect varying properties of the D layer presented as a lower region of the ionosphere when these waves propagate through the Earth-Ionosphere Waveguide. This study describes the set-up of our station system and it demonstrates its ability to detect sudden ionospheric disturbances caused by solar flares in May, June, July, August, and September 2017. We found out that the monitoring station is working successfully to receive FLV signals, and to detect sudden ionospheric disturbances. We detected 17 events resulting from solar flare C-class, 8 events from M-class, and 3 events from X-class that caused an increase in the received FLV amplitude.

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Evaluation of the Strenght of Reflection and Dispersion of High Frequency in the Ionosphere by VOACAP model

Difar

Nema

Jasim

et al. 2020

2020 13th International Conference on Communications (COMM)

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Investigation of the Different Models Performance for Evaluating the Disturbance in the Ionosphere

Cited by 5 publications

References 6 publications

Examining the Seasonal Correlations Among Different Ionospheric Indices During Solar Cycle Twenty-Four

Examining the Seasonal Correlations Among Different Ionospheric Indices During Solar Cycle Twenty-Four

X-Ray Solar Flares Observed and Detected by The New Very-Low-Frequency Receiver in Nasiriyah City, South of Iraq

Evaluation of the Strenght of Reflection and Dispersion of High Frequency in the Ionosphere by VOACAP model

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