Analysis of solar radio bursts type II and III using multiple instruments observations / Ahmad Najwan Zulkiplee

Ahmad Najwan , Zulkiplee (2024) Analysis of solar radio bursts type II and III using multiple instruments observations / Ahmad Najwan Zulkiplee. Masters thesis, Universiti Malaya.

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Abstract

Solar radio activity is one of the elements that can be harvested to obtain knowledge of our solar system in the field of radio astronomy. Using the Compound Astronomical Low-Frequency Low-cost Instrument for Spectroscopy and Transportable Observatory (CALLISTO) as one of the mediums in capturing the radio emission coming from the Sun, the studied of the solar radio bursts dynamics can be extensively analyzed which is the primary object for this work. This work emphasizes the use of multiple solar radio instruments used for capturing the emission of solar radio bursts other than CALLISTO such as Nancay Radioheliograph (NRH) and Half-wave Dipole Antenna (HWDA). The purpose of using these multiple instruments will benefit in the exploration of the unique features such as band splitting and ‘herringbone’ that existed within the solar radio bursts emission which are still lowly studied. The brightness temperature and degree of circular polarization of the solar radio bursts emission has been determined to propose an early finding of the emission mechanism of these unique features. Previous studies have proof that the solar radio bursts phenomena have a strong relation with solar activities such as solar flares and coronal mass ejections (CMEs) but the effect of the latter activities in a large-scale manner is still limited. This work has presented the influence of it toward the formation of solar radio bursts activities with the use of instrument from Space Weather Prediction Centre by National Oceanic and Atmospheric Administration (SWPC/NOAA), Geostationary Operational Environmental Satellite (GOES), and the Solar and Heliospheric Observatory mission’s instrument which is the Large Angle and Spectrometric Coronagraph (SOHO/LASCO). Through these multiple observations, it was found that strong solar flares and CMEs do play a role in generating multiple solar radio bursts. Lastly, with the knowledge of the solar radio bursts unique features and its relationship with strong solar flares and CMEs, determination of suitable candidate of solar radio burst type II with clear appearances of band splitting has been performed across the year of 2017. This candidate will be useful for future detection of the HWDA that is currently undergoing major improvement for its next version of upgraded HWDA (uHWDA). In summary, the result of this work clearly shown that radio emission of ‘herringbone’ features is being generated through the fundamental plasma mechanism, large scale of solar flares and CMEs activities resulted in formation of multiple bursts of different types simultaneously and solar radio burst event on 23rd July 2016 would be the best candidate to be observed using the newly developed uHWDA.

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