Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 59 for “"Solar flares"”.
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The Impact of Sunspot Rotation on Solar Flares
Solar flares are one mechanism to release stored magnetic energy in the Sun’s atmosphere. This thesis aims to determine whether sunspot rotation can inject the energy required for solar flares into the corona. This thesis investigates the relationship between sunspot rotation and solar flares, and …
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A Statistical Study of Hard X-Ray Solar Flares
The results of a statistical study of hard x-ray solar flares are presented in this dissertation. Two methods of analysis were used, the Diffusion Entropy (DE) method coupled with an analysis of the data distributions and the Rescaled Range (R/S) Method, sometimes referred to as "Hurst's method". …
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Automatic prediction of solar flares and super geomagnetic storms
… may produce many harmful effects on Earth. Solar flares and Coronal Mass Ejections (CMEs) are believed to be the major causes of geomagnetic storms. Thus, establishing a real time forecasting method for them is very important in space weather study. The topics covered in this dissertation …
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Hard X-ray and radio studies of solar flares
… acceleration and transport effects during solar flares. In this thesis we present observations of two solar flares. In the first event we report what we believe to be the first observation of hard X-ray emission formed in a coronal, flare-related jet. Occurring on the 22nd of August 2002, …
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Wave-particle interactions in the solar wind and solar flares
… plasma waves play an important role in both the solar wind and solar flares. The dynamics of plasma turbulence in these settings controls the strength of the interactions, by determining the amplitudes of the small-scale electromagnetic fluctuations that have the largest effect on the particles. …
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Small and large-scale magnetic fields involved with solar flares
Solar flares are generally identified as an important source of disturbances that affect space weather, while many aspects of the basic flare process are still not well understood. The purpose of the present work has been to investigate the small and large-scale magnetic structures and their …
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Numerical simulations of radiation and heating from non-thermal electrons in solar flares
… from magnetic loops in active regions of the solar atmosphere using numerical simulations. The simulations also allow investigation of Type III radio emission. In our model we vary a number of physical parameters such as magnetic field configuration and density models, investigating the effect …
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Automated Prediction of Solar Flares Using SDO Data. The Development of An Automated Computer System for Predicting Solar Flares Based on SDO Satellite Data Using HMI Images Analysis, Visualisation, and Deep Learning Technologies
… industries, impacting our lives. One of the main solar activities that is considered as a major driver of space weather is solar flares. Solar flares can be defined as an enormous eruption in the sun's atmosphere. This phenomenon happens when magnetic energy stored in twisted magnetic fields, …
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Automated Prediction of Solar Flares Using SDO Data. The Development of An Automated Computer System for Predicting Solar Flares Based on SDO Satellite Data Using HMI Images Analysis, Visualisation, and Deep Learning Technologies
… industries, impacting our lives. One of the main solar activities that is considered as a major driver of space weather is solar flares. Solar flares can be defined as an enormous eruption in the sun's atmosphere. This phenomenon happens when magnetic energy stored in twisted magnetic fields, …
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An Investigation of Sudden Frequency Deviations Due to the Immediate Ionospheric Effects of Solar Flares
Made available in DSpace on 2014-12-08T22:23:58Z (GMT). No. of bitstreams: 1 6612314.pdf: 7455238 bytes, checksum: bb063480c4e98e7a69d35dba302a0012 (MD5) Previous issue date: 1966
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Hard X-ray diagnostics of particle acceleration and energy release in solar flares and coronal jets
… This dissertation investigates two forms of solar activity capable of accelerating particles to high energies—solar flares and coronal jets, both of which are driven by magnetic reconnection. Hard X-ray (HXR) emissions, produced via bremsstrahlung, provide direct diagnostics of thermal plasma …
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Examining the response of the Martian atmosphere to increases in different portions of the electromagnetic spectrum during solar flares
… portions of the electromagnetic spectrum during solar flares. On March 24, 2015 the Mars Atmosphere and Volatile Evolution (MAVEN) mission satellite made measurements of the atmosphere and solar irradiance during a solar flare. These measurements were used by the Flare Irradiance Spectral Model …
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The analysis and the three-dimensional, forward-fit modeling of the hard x-ray and the microwave emissions of major solar flares
Solar flares are one of the most violent and energetic space weather events that are known to cause various adverse effects on the Earth. One of the major problems that must be solved to understand flares and to be able to predict their magnitudes is how the particles in the solar atmosphere are …
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Characterization and Modeling of Solar Flare Effects in the Ionosphere Observed by HF Instruments
… frequency (HF, 3-30 MHz) radiowave propagation. Solar activities, such as solar flares, radiation storms, coronal mass ejections (CMEs), alter the state of the ionosphere, a phenomenon known as Sudden Ionospheric Disturbance (SID), that can severely disrupt HF radio communication links by …
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Enhanced flare prediction by advanced feature extraction from solar images : developing automated imaging and machine learning techniques for processing solar images and extracting features from active regions to enable the efficient prediction of solar flares.
… impact it can have on modern societies. Solar flares are one of the major solar activities that drive space weather and yet their occurrence is not fully understood. Research is required to yield a better understanding of flare occurrence and enable the development of an accurate flare …
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Enhanced flare prediction by advanced feature extraction from solar images : developing automated imaging and machine learning techniques for processing solar images and extracting features from active regions to enable the efficient prediction of solar flares
… impact it can have on modern societies. Solar flares are one of the major solar activities that drive space weather and yet their occurrence is not fully understood. Research is required to yield a better understanding of flare occurrence and enable the development of an accurate flare …
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Auroral radio absorption : modelling and prediction
… closed field lines and (>MeV) protons from the solar wind are responsible for enhanced high frequency radiowave absorption in the high latitude ionosphere. Measuring the propagation of radio waves through the ionosphere has been utilised for investigating particle precipitation into the upper …
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An analysis of changes in the magnetic field of active region 9415 after the 2001 April 6 Solar Flare
… current understanding of the correlation between solar flares and magnetic flux change. The average gradient of the magnetic flux around the neutral line of Active Region 9415 and the locations of the magnetic flux centers-of-mass in both polarities in AR 9415 were determined. Subsequent to the …
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Development of advanced algorithms to detect, characterize and forecast solar activities
Study of the solar activity is an important part of space weather research. It is facing serious challenges because of large data volume, which requires application of state-of-the-art machine learning and computer vision techniques. This dissertation targets at two essential aspects in space …
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