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 172 for “"Flare"”.
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Atmospheric responses to flare generated sunquakes
… first detection of an atmospheric response to a flare induced Sunquake (SQ). Ground-based observations of the Ca II 8542 Å and H-α 6563 Å passbands from the Swedish 1-m Solar Telescope (SST) were used in combination with space-based observations from the Heliosesimic and Magnetic Imager (HMI) …
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Flare stars in the solar vicinity
… main sequence can be provided by the catalog of flare stars and related objects compiled by Gershberg et al. (1999) because young stars are often variable and exhibit large eruptions (flares). In a first step we need to verify that these stars are indeed young and did not come to lie above the …
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Crab flare observations with H.E.S.S. phase II
… such as the recently discovered very energetic flares of high energy gamma-ray radiation. During its most recent flare, which was detected by the Fermi satellite in March 2013, the Crab Nebula was simultaneously observed with the H.E.S.S. array for six nights. The results of the observations …
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Solar flare gamma-ray spectroscopy with CGRO-COMPTEL
<p>The X-ray and gamma-ray emission from solar flares provides important information about high-energy particles in solar flares. Energetic protons and ions interact with the solar atmosphere, giving rise to nuclear line emission at MeV energies and higher energy photons from the decay of neutral …
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Electron acceleration in a flare plasma via coronal circuits
… is closely related to the sunspot numbers. Flares play a special role, because they release large energies on very short time scales. They are correlated with enhanced electromagnetic emissions all over the spectrum. Furthermore, flares are sources of energetic particles. Hard X-ray …
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An analysis of reconnection dynamics in an eruptive flare model
… model for current sheets that form during solar flares. The model uses a method developed by B. V. Somov & V. S. Titov for Petschek-type reconnection. The first part of this dissertation provides a detailed analysis of the Somov-Titov model, its assumptions, strengths and weaknesses. We consider …
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Optical and X-ray studies of newly discovered flare stars
… presented demonstrating that selection of dMe flare stars from their EU V/optical flux ratio revealed some of the most active members from the ROSAT Wide Field Camera (WFC) and EUVE all-sky surveys. During a total photometric monitoring time of 121 hrs on 6 new stars, there were 54 separate …
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Solar flare effects observed over Jicamarca during MST-ISR experiments
A study of solar flare effects observed at the Jicamarca Radio Observatory (JRO) will be presented. The observations were made while the Jicamarca radar was conducting combined observations in mesosphere-stratosphere-troposphere (MST) and incoherent scatter radar (ISR) modes. Combined MST-ISR …
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Analysis and Modelling of a Type II White-light Solar Flare
Type II white-light flares (WLFs) are rare impulsive events in solar atmosphere observed across the electromagnetic spectrum, but without the characteristic emission in hydrogen lines. A unique set of multi-instrument observations is presented with broad wavelength range spectra in the visible and …
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Evolution of 3-d magnetic topology in flare-productive active regions
Solar eruptive phenomena, such as flares and coronal mass ejections (CMEs), derive their energy from complex magnetic fields and are the principal source of disturbances that affect space weather. Although physical mechanism and dynamic morphology of flares have been a subject of intense research, …
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Influence of photospheric back-scatter on flare hard x-ray diagnostics.
… photospheric back–scatter on Hard X–Ray (HXR) flare diagnostics. Specifically the thesis presented is concerned with the effect of back–scatter photons upon the morphology of the Hard X–Ray photon spectrum and its effect on the inferred parent electron spectrum. I present a theoretical …
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From Flare to Repair: Commensal Bacteria's Influence on Inflammation and Wound Healing
Extensive crosstalk between the microbiome and the immune system is well established, and the gut microbiota has been recognized as a critical contributor to various diseases such as inflammatory bowel disease (IBD), cancer, and even extra-intestinal inflammatory manifestations. Disruptions of the …
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Validation of solar flare forecasting & evolution of magnetic helicity of two active regions
… two components: (1) Validation of the NJIT flare-forecasting model that was established in recent years is carried out based on the statistical correlation between solar magnetic parameters and flare productivity of active regions (ARs). 378 ARs are examined, comparing observation with …
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Using active contours for automated tracking of UV and EUV solar flare ribbons
Solar flare UV and EUV images show elongated bright ``ribbons'' that move over time. If these ribbons are assumed to locate the footpoints of magnetic field lines reconnecting in the corona then it is clear that studying their evolution can provide an important insight into the reconnection …
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DEVELOPMENT AND TESTING OF A NEW AIR-ASSISTED FLARE SYSTEM FOR LOW FLOW CONDITIONS
<p>"Flare systems provide a safe, efficient, and reliable way to treat unwanted flammable gases that come from relief devices of various chemical processing equipment to ensure the safety of personnel and equipment. Flare systems are classified according to the assist media type as non-assisted …
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Characterization and Modeling of Solar Flare Effects in the Ionosphere Observed by HF Instruments
… 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 enhancing radiowave absorption and …
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Machine Learning techniques to discover and understand the population of flare stars in MeerLICHT data
In this era of information overload, machine learning and artificial intelligence have been increasingly popular in various fields, including the field of astronomy. These approaches attempt to extract meaningful information from the data through automated means. In this work, we develop generic …
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A numerical study on the effect of bow flare angle on green water loading on FPSO
… on the analysis of the effects of the bow flare angle above the free surface on the hydrodynamic loads associated with the green water phenomenon.;When designing the bow flare angle of the FPSO considering the influence of the green water, it is very important to understand the amount of …
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