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 6 of 6 for “"Hydrogen alpha"”.
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Studies of TeV Gamma-Ray Sources in the Hydrogen-Alpha Optical Line
The first way humanity explored our Milky Way Galaxy and the Universe was through optical light observations. That led us to explore the cosmos using different electromagnetic wavebands such X-rays, gamma-rays, and radio wavelengths. Since then multi-wavelength studies of sources have started to …
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Extinction of 10.6 μm laser radiation by free electrons in an argon discharge at atmospheric pressure
… as determined by Stark broadening of the hydrogen alpha (656.28 nm) and 4p'[1/2]-4s[3/2]^0 argon I (696.54 nm) lines. Experiments indicate that the observed extinction of 10.6 μm is attributable to a combination of inverse bremsstrahlung and a negative lens effect, and the results will be …
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Automation of the Spectral-Line Imaging Camera for the Virginia Tech Spectral-Line Survey
… is a high sensitivity, high resolution survey of Hydrogen-$\alpha$ and Sulfur-II emission in the full northern hemisphere. The instrument used for the survey is the Spectral Line Imaging Camera (SLIC). SLIC uses a fast(f/1.2) lens attached to a cryogenically cooled, TK 512x512 CCD with 27 micron …
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Stellar Energy Feedback in Superbubbles
… we have used previous observations in hydrogen alpha-line emission to determine the kinematics of their ionized gas components. In the final study, the energy feedback efficiencies of the superbubbles N11 and N44 in the LMC are examined. The injected energies absorbed by the shells have …
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An Arcminute-Resolution Imaging Study of the H-alpha & [S II] Emission of the ISM from the Local Perseus Arm Using the Virginia Tech Spectral-Line Survey
… greater than -15 degrees. The Wisconsin Hydrogen-Alpha Mapper (WHAM) studies the kinematics and distribution of this same material on an angular scale of one degree. Comparing the spatially-resolved images of the VTSS with WHAM's high spectral resolution images shows that the ISM's …
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Development of advanced algorithms to detect, characterize and forecast solar activities
… feature on the bright solar disk in H[alpha] (Hydrogen-alpha) full-disk solar images. In this dissertation, an automatic solar filament detection and characterization method is presented. The investigation illustrates that the statistical distribution of the Laplacian filter responses …