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 24 for “"Radio bursts"”.
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Statistical study of solar radio bursts
The peak flux distribution of 40 years of solar radio burst data recorded by NOAA, as a function of frequency and time over a wide range of frequencies, was investigated to quantify the potential impact of radio bursts on wireless systems. Tables of fit parameters, which can be used to find burst …
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The nature of fast radio bursts
The origin of fast radio bursts (FRBs) is a major open question in the field of astrophysics. We propose that FRBs are produced by synchrotron maser emission (SME) that occurs as a result of non-resonant interactions between Alfv´en waves and relativistic plasma. We examine the results of such an …
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The radiation mechanism of fast radio bursts
Recent observations show that fast radio bursts (FRBs) are energetic but probably non-catastrophic events occurring at cosmological distances. The properties of their progenitors are largely unknown in spite of many attempts to determine them using the event rate, duration and energetics. …
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Mathematical methods for classifying fast radio bursts
The recent extragalactic discovery of Fast Radio Bursts (FRBs) has ignited a whirlwind of research, and numerous fundamental questions about them are being studied. This thesis delves into this field, aiming to bridge the gap in our exploration of FRB populations. The FRBs are cosmic transients …
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Searching for an optical counterpart to Fast Radio Bursts
Fast radio bursts (FRBs) are bright, short-lived bursts of radio emission of extragalactic origins. Despite being immensely luminous, the answer to what actually causes FRBs remains a mystery. Numerous models have been proposed, but it is difficult to narrow down the list because, up until now, …
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Computational analysis techniques using fast radio bursts to probe astrophysics
This thesis focuses on Fast Radio Bursts (FRBs) and presents computational techniques that can be used to understand these enigmatic events and the Universe around them. Chapter 1 provides a theoretical overview of FRBs; providing a foundation for the chapters that follow. Chapter 2 details current …
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Cosmic string cusps and their application to fast radio bursts
… power, rate, and time scale of any radiation bursts. The second is consideration of wiggly cosmic strings. Simulations imply a distribution of strings in an expanding universe develop small-scale structure called wiggles. We extend on a wiggly Polyakov formalism and show that wiggles prohibit …
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Probing the Diversity of Fast Radio Bursts with CHIME/FRB
Fast radio bursts (FRBs) are extremely bright extragalactic radio transients that flash for microseconds to milliseconds at a time, most never to repeat again. Encoded in every observed FRB is information from burst propagation effects, giving us clues about their mysterious origins as well as the …
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Constraining reionization: Evidence from 21 cm limits and predictions for fast radio bursts
… cm signal, and forecasts for high redshift Fast Radio Bursts (FRBs). Firstly, I examine the influence of cosmic reionization on FRBs. They are recently discovered extra-galactic sources of strong radio signals, and the dispersion measure of these signals is sensitive to the ionization state of …
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Localization and Lensing of Fast Radio Bursts using CHIME/FRB and its VLBI Outriggers
… a luminous, millisecond-duration flash of radio light arrives at Earth from outside the Milky Way. These elusive fast radio bursts (FRBs) last just a millisecond, and the vast majority are never detected again. FRBs are powerful probes of dark matter and cosmological structure, and offer …
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Investigating the nature of Peculiar Supernovae and Fast Radio Bursts via their multi-wavelength properties and environments
… such as the origins of black holes, fast radio bursts, the nature of supernova explosions, the mechanisms driving gamma-ray bursts, and the role of mergers in producing gravitational waves. Two peculiar classes of transients, fast radio bursts (FRBs) and superluminous supernovae (SLSNe), …
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Propagation of energetic electrons in the solar corona observed with LOFAR
… and spectroscopic observations of solar type III radio bursts at low radio frequencies in the range from 30 to 80 MHz. Solar type III radio bursts are understood as result of the beam-plasma interaction of electron beams in the corona. The Sun provides a unique opportunity to study these plasma …
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Detecting anomalous transients in meertrap data
… incredible potential for discovery. The MeerKAT radio telescope in South Africa has proven to be an excellent telescope to search for fast radio transients such as pulsars and fast radio bursts (FRBs). MeerTRAP (more TRAnsients and Pulsars), which commensally uses MeerKAT to search for fast radio …
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Search and multi-frequency follow-up studies of radio transients: novel approaches and large campaigns
One of the most fascinating phenomena in modern radio astronomy is related to the Fast Radio Bursts (FRBs). FRBs are Jy-intense, ms-duration radio transients of extra-galactic origin, whose nature is not assessed yet. To date, FRBs have been observed only in the radio band. Despite their origin has …
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Multimessenger signatures of compact binaries
… for gravitational waves coincident with fast radio bursts from the only Galactic fast radio burst source. Lastly, I perform an electromagnetic study of Type Ia supernovae in the mid-infrared, whose white dwarf binary progenitors will be mHz gravitational-wave sources for the future LISA space …
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Small and large-scale magnetic fields involved with solar flares
… observations of flares from hard X-rays to radio wavelengths obtained from several ground-and space-based instruments. The studied topics in the flare core regions include microflares, flare-induced evolution of the photospheric magnetic field, and sigmoids. The large scale study includes …
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Electron acceleration at localized wave structures in the solar corona
… considered to be the source of the nonthermal radio and X-ray radiation. One of the most important and still open question in solar physics is how the electrons are accelerated up to high energies within (the observed in the radio emission) short time scales. Because the acceleration site is …
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Controlling for the Ionospheric and Baseline-Offset Uncertainties in the CHIME/FRB Outriggers VLBI Network for Milliarcsecond Precision
Fast radio bursts (FRBs) are a novel form of radio transients discovered in 2007. These bright, extragalactic radio signals have an inferred all-sky rate of hundreds of detections per day. The properties of FRBs hold valuable clues about the extreme physical processes driving them while also …
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EUV Spectroscopy of Solar Active Region Jets
… magnetic activity, nonthermal type-III radio bursts and soft/hard X-ray emission has been studied using the Helioseismic and Magnetic Imager (HMI) on board SDO, the WAVES instrument on board the Wind satellite and the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) …
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