Magnetic properties of active regions (ARs) and its contribution to solar radio burst type II and solar radio burst type III

Sabri, Siti Nur Umairah (2026) Magnetic properties of active regions (ARs) and its contribution to solar radio burst type II and solar radio burst type III. PhD thesis, Universiti Teknologi MARA (UiTM).
Abstract

Solar activity of the Sun is becoming a growing concern as it may influence activity on Earth. The Sun's gases, moving in a plasma state, constantly create tangles, stretches, and twists in its magnetic fields. The Sun surface tends to be active and quiet depends on stages of the solar cycle. Magnetic field and Type II bursts are associated with solar flares and CMEs, which can potentially release solar energetic particles. The productivity of flares is connected to the magnitudes of flares and magnetic complexity. However, it has limitation in direct observations of magnetic properties of Active Regions (ARs). The main objectives are to determine the maximum counts of the magnetic classifications of sunspots in early stages of the Solar Cycle 25 and to evaluate the probability magnetic classification of the sunspot triggering Type II burst and Type III burst and its correlation. Next, to investigate the effect of magnetic properties of AR towards structure and characteristics of Type II burst and Type III burst. Descriptive statistical, R-value Pearson Correlation and ANOVA using Statistical Packages for Social Sciences (SPSS) and Linear Regression Analysis are method used in this research. From findings, it concluded that a sunspot, 33.24%, (βy sunspot ,28.49% and β sunspot, 25.14%) has the highest magnetic classification of sunspot occurred in 3 years. The relationship between sunspot number and solar radio flux in all sunspots showed positive correlation and has slightly differences in variance. It statistically proved solar radio flux is directly proportional to sunspot number, however, unreliable to predict magnetic field. Next findings are the highest possibility to trigger Type II burst and Type III burst are originated from β sunspot followed by other sunspots. β sunspot has highest tendency to trigger Type III burst (37 events) and followed by Type II burst (17 events). β sunspot has range intensity of flares from 1.0 x 10~5Wm~2 to 1.9 x 10~5Wm~2. The greater the intensity of flares released from the sunspot affects the area and complexity of sunspot. It displayed that X-class of flares released greater number of magnetic properties of ARs (7 SHARP parameters) such as USFLUX, TOTUSJH, TOTUSJZ, TOTPOT, MEANPOT, AREA ACR and SHRGT45 compared to M-class of flares. This research is crucial in forecasting solar activity in Solar Cycle 25 and study the difference between magnetic properties of ARs with previous solar cycles. Magnetic properties of ARs are crucial and significant to provides information solar flares and CMEs which causes eruptions solar radio burst to our earth.

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