Download or read book Solar Polarimetry Techniuques and Applications written by K. Sankarasubramanian and published by . This book was released on 2001 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Instrument Systems for Imaging Spectro Polarimetry written by Alex J. Feller and published by Cuvillier Verlag. This book was released on 2008-04-01 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is devoted to the development and the application of novel instrument systems and measuring techniques in the field of solar polarimetry. The work is split into three parts, each part addressing an independent project in terms of scientific objectives and implementation. In the first part I describe the development and implementation of a tunable narrow-band filter system to be used in combination with the Zurich Imaging Polarimeter for quasi-monochromatic imaging vector polarimetry. Its working range covers the visible spectrum between 390 nm and 660 nm. The bandwidth varies between 2 pm and 12 pm, depending on wavelength and optical setup. The main filter components are two lithium-niobate Fabry-Pérot interferometers which can be tuned by applying a voltage or by changing the temperature. In the current version of the instrument the interferometers are used in series in a single-pass tandem configuration. The filter system will allow us to explore the spatial structuring of the polarized solar spectrum, including vector mapping of the Hanle and Zeeman effects in any spectral line. First polarimetric images recorded at the SST and at IRSOL in the spectral lines of Ca I 422.7 nm, Sr I 460.7 nm and Hα 656.3 nm show that the instrumentation and its operation is technically mature. The filter system is now available for scientific observations. The second part deals with a laboratory experiment linked to a solar polarization anomaly that has remained an unresolved enigma for many years. While scattering processes usually produce polarized radiation, certain spectral lines, in particular the Fraunhofer D1line of neutral sodium at 589.6 nm should be intrinsically unpolarizable according to the standard quantum mechanical scattering theory. In contrast, observations in quiet regions on the Sun reveal a polarization peak centered in the D1 line core. As the solar atmosphere is a complex environment with an optically thick medium permeated by a tangled and fractal-like magnetic field, we have set up a laboratory experiment with a sodium vapor cell to obtain an answer to the question: Is the sodium D1 anomaly a problem for atomic or for solar physics? The experimental results are consistent with the theoretical null prediction of atomic physics. Furthermore the experiment gives an upper limit for the D1 polarization which is smaller than the signal observed on the Sun. Although this result does not provide the definitive answer to the problem, it permits to conclude that the clarification of the D1 anomaly has to involve solar physics. The third project included in this thesis is the development of a dedicated instrument to capture the polarization of the chromospheric emission spectrum (flash spectrum) during the total solar eclipse of March 29, 2006. The whole visible range and small overlaps with near UV and near IR have been covered with a spectral resolution of 3000. The minimum sampling period was chosen to be 20 ms, which corresponds to a height resolution of some 10 km in the solar atmosphere, along the direction of the lunar movement. The flash spectrum has been successfully recorded during the above-mentioned eclipse in the Sahara desert in southern Libya. For several spectral lines the noise level in the degree of polarization is of order 1% which allows us to compare with theoretical predictions. However, it is tricky to correct for the systematic errors because of optical aberrations in the observed spectra.
Download or read book Polarimetric Detection Characterization and Remote Sensing written by Michael I. Mishchenko and published by Springer. This book was released on 2011-05-27 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the need for accurate and non-invasive optical characterization and diagnostic techniques is rapidly increasing, it is imperative to find improved ways of extracting the additional information contained within the measured parameters of the scattered light. This is the first specialized monograph on photopolarimetry, a rapidly developing, multidisciplinary topic with numerous military, ecological remote-sensing, astrophysical, biomedical, and technological applications. The main objective is to describe and discuss techniques developed in various disciplines to acquire useful information from the polarization signal of scattered electromagnetic waves. It focuses on the state-of-the-art in polarimetric detection, characterization, and remote sensing, including military and environmental monitoring as well as terrestrial, atmospheric, and biomedical characterization. The book identifies polarimetric techniques that have been especially successful for various applications as well as the future needs of the various research communities. The monograph is intended to facilitate cross-pollination of ideas and thereby improve research efficiency and help advance the field of polarimetry into the future. The book is thoroughly interdisciplinary and contains only invited review chapters written by leading experts in the respective fields. It will be useful to science professionals, engineers, and graduate students working in a broad range of disciplines: optics, electromagnetics, atmospheric radiation and remote sensing, radar meteorology, oceanography, climate research, astrophysics, optical engineering and technology, particle characterization, and biomedical optics.
Download or read book Applications of High precision Polarimetry to Extrasolar Planet Search and Solar Physics written by Christian Thalmann and published by . This book was released on 2008 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Planets Stars and Nebulae written by Tom Gehrels and published by University of Arizona Press. This book was released on 1974-03 with total page 1160 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The polarization study of celestial objects is a valuable part of optical astronomy, and the author has done exceptionally well in bringing to gether contributions treating all aspects of the polarimetry field. . . . The first section contains a fine introduction and an excellent and definitive history of the subject. . . . The volume is well illustrated. . . . Highly recommended."ÑChoice "The high quality of this book is clearly due to strict editorial attention to each paper and the discussions. Gehrel's book will surely stand for many years as the fundamental reference source for polarization studies in astronomy as well as in atmospheric physics."ÑJournal of the Assoc. of Lunar and Planetary Observers
Download or read book Astronomical Polarisation from the Infrared to Gamma Rays written by Roberto Mignani and published by Springer Nature. This book was released on 2019-09-14 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book serves as both a primer to astronomical polarimetry and an authoritative overview of its application to various types of astronomical objects from AGN, compact stars, binary systems, stars across the HR diagram, transients, the interstellar medium and solar system bodies. It starts with an historical perspective, a discussion of polarimetric theory, instrumentation and techniques in wave bands from the near infrared to gamma rays. The book presents the state of the art in astronomical polarimetry. It is motivated by the new X-ray polarimeters due to be launched in the next four years and improved optical polarimeters on large telescopes requiring a new analysis of polarimetric theory, methodology and results.This book will be suitable as advanced undergraduate companion text, a primer for graduate students and all researchers with an interest in astronomical polarimetry.
Download or read book Introduction to Spectropolarimetry written by Jose Carlos del Toro Iniesta and published by Cambridge University Press. This book was released on 2003-03-06 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectropolarimetry embraces the most complete and detailed measurement and analysis of light, as well as its interaction with matter. This book provides an introductory overview of the area, which plays an increasingly important role in modern solar observations. Chapters include a comprehensive description of the polarization state of polychromatic light and its measurement, an overview of astronomical (solar) polarimetry, the radiative transfer equation for polarized light, and the formation of spectral lines in the presence of a magnetic field. Most topics are dealt with within the realm of classical physics, although a small amount of quantum mechanics is introduced where necessary. This text will be a valuable reference for graduates and researchers in astrophysics, solar physics and optics.
Download or read book Astronomical Polarimetry written by Jaap Tinbergen and published by Cambridge University Press. This book was released on 2005-08-22 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiation from astronomical objects generally shows some degree of polarization. Although this polarized radiation is usually only a small fraction of the total radiation, it often carries a wealth of information on the physical state and geometry of the emitting object and intervening material. Measurement of this polarized radiation is central to much modern astrophysical research. This handy volume provides a clear, comprehensive and concise introduction to astronomical polarimetry at all wavelengths. Starting from first principles and a simple physical picture of polarized radiation, the reader is introduced to all the key topics, including Stokes parameters, applications of polarimetry in astronomy, polarization algebra, polarization errors and calibration methods, and a selection of instruments (from radio to X-ray). The book is rounded off with a number of useful case studies, a collection of exercises, an extensive list of further reading and an informative index. This review of all aspects of astronomical polarization provides both an essential introduction for graduate students, and a valuable reference for practising astronomers.
Download or read book Advanced Solar Polarimetry written by National Solar Observatory/Sacramento Peak. Summer Workshop and published by . This book was released on 2001 with total page 615 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polarimetry of Stars and Planetary Systems written by Ludmilla Kolokolova and published by Cambridge University Press. This book was released on 2015-05-14 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of state-of-the-art techniques, models and research methods in modern astronomical polarimetry.
Download or read book Solar Polarimetry written by Lawrence J. November and published by . This book was released on 1991 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Asteroids IV written by Patrick Michel and published by University of Arizona Press. This book was released on 2015-12-31 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, asteroids have come to the forefront of planetary science. Scientists across broad disciplines are increasingly recognizing that understanding asteroids is essential to discerning the basic processes of planetary formation, including how their current distribution bespeaks our solar system’s cataclysmic past. For explorers, the nearest asteroids beckon as the most accessible milestones in interplanetary space, offering spaceflight destinations easier to reach than the lunar surface. For futurists, the prospects of asteroids as commercial resources tantalize as a twenty-first-century gold rush, albeit with far greater challenges than faced by nineteenth-century pioneers. For humanity, it is the realization that asteroids matter. It is not a question of if—but when—the next major impact will occur. While the disaster probabilities are thankfully small, fully cataloging and characterizing the potentially hazardous asteroid population remains unfinished business. Asteroids IV sets the latest scientific foundation upon which all these topics and more will be built upon for the future. Nearly 150 international authorities through more than 40 chapters convey the definitive state of the field by detailing our current astronomical, compositional, geological, and geophysical knowledge of asteroids, as well as their unique physical processes and interrelationships with comets and meteorites. Most importantly, this volume outlines the outstanding questions that will focus and drive researchers and students of all ages toward new advances in the coming decade and beyond.
Download or read book The Second Solar Spectrum written by Achim Gandorfer and published by vdf Hochschulverlag AG. This book was released on 2005 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solar Polarimetry written by National Solar Observatory/Sacramento Peak. Summer Workshop and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Polarimetry and Polarimetric Imaging written by Xiaobo Li and published by . This book was released on 2024-07-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a fundamental property of the light wave, polarization information can be used to reveal the light and target's physical properties, such as the material, thickness, surface features, refractive index, etc. Thanks to the unique advantages of polarization information, polarimetry and polarimetric imager techniques have promising applications in several fields, including object detection, biomedical imaging, remote sensing, astronomical observation, the characterization of surfaces and thin films, optical communication, etc. The theories, instruments, and interpretation methods for polarimetry and polarimetric imaging are constantly developing; therefore, improving the performance of polarimetry and polarimetric imagers and exploring related applications are still necessary to address existing challenges and expand the potential of polarimetric imaging. "Advanced Polarimetry and Polarimetric Imaging" highlights new theories in and applications of advanced polarimeters and polarimetric imaging. Seventeen manuscripts were submitted to this reprint. This reprint on polarization technology illustrates the field's notable progress and potential. It features research articles that introduce innovative solutions and tackle key challenges in polarimetric image restoration, 3D reconstruction, high-speed Mueller ellipsometry, and P-lidar. These promising applications and novel approaches in polarimetry and imaging technology herald a promising future.
Download or read book Solar Polarimetry written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polarization in Spectral Lines written by M. Landi Degl'Innocenti and published by Springer Science & Business Media. This book was released on 2006-05-17 with total page 899 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scientific research based on spectropolarimetric techniques is undergoing a phase of rapid growth. Instruments of unprecedented sensitivity are nowadays available, particularly for solar observations. To fully exploit the rich diagnostic content of such observations, it is necessary to understand the physical mechanisms involved in the generation and transfer of polarized radiation in astrophysical (or laboratory) plasmas. After an introductory part based on classical physics, this book tackles the subject by a rigorous quantum-mechanical approach. The transfer equations for polarized radiation and the statistical equilibrium equations for the atomic density matrix are derived directly from the principles of Quantum Electrodynamics. The two sets of equations are then used to present a number of applications, mainly concerning the diagnostics of solar magnetic fields. This book is primarily addressed to scientists working in the field of spectropolarimetry. It may also serve as a textbook for a course at the graduate or advanced undergraduate level.
