Download or read book The Optical Aurora written by A. Omholt and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to describe and discuss the aurora as an optical phenomenon, one which can be observed by the naked eye as well as with more sensitive optical detectors. It continues the tradition of study ing that impressive and imaginative play of nature, the northern lights, seen and discussed by the Greek philosphers as early as the sixth century B.c. Today the study of the optical aurora is only one of many ways of acquiring information about a major phenomenon: the ejection of plasma from the sun, the interaction of this plasma with the geomagnetic field and the injection of fast particles into the earth's atmosphere. of the optical aurora is justified by the Hence, the separate treatment particular scientific approach: detection and interpretation of electro magnetic radiation, approximately in the 1000-100000 A region, produc ed through interaction between the auroral particles and the earth's atmosphere. Other techniques, such as radio observations, X-ray observations, direct particle detections from rockets and satellites, studies of magnetic storms, and measurements of the magnetic field and plasma properties in the magnetosphere, are as important or more important than the classical way of studying the optical aurora. Nevertheless, it was felt worthwhile to treat the optical aurora in a separate book, perhaps mainly because today one author cannot master the whole subject with sufficient competence. This book is thus one volume in a series of books giving a more complete picture of physics and chemistry in space.
Download or read book The optical aurora written by A. Omholt and published by . This book was released on 1971 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In the Light of the Aurora written by Network for Groundbased Optical Auroral Research in the Artic Region and published by Nordic Council of Ministers. This book was released on 2009 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aurora, or northern lights, is the most variable light phenomenon in the sky and the result of physical processes taking place in near-Earth space. The colours, shapes, intensities, locations and movements of auroral forms give us information about these processes. Ground-based optical studies are superior for high-resolution measurements and to distinguish temporal and spatial effects. Arctic Europe is a most convenient place to study the aurora. Many instruments and research facilities have been placed here. The Network for Groundbased Optical Auroral Research in the Arctic Region is supported by the Nordic Council of Ministers and consists of all research institutions in northern Norway, Sweden, Finland and on theKola Peninsula active in optical auroral research. This reportintroduces optical aurora and optical research methods, research institutions and research infrastructure. It also describes the activities of the network: workshops, mobility programme and scientific results.
Download or read book In the Light of the Aurora written by Nordic Council of Ministers and published by . This book was released on 2009 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aurora, or northern lights, is the most variable light phenomenon in the sky and the result of physical processes taking place in near-Earth space. The colours, shapes, intensities, locations and movements of auroral forms give us information about these processes. Ground-based optical studies are superior for high-resolution measurements and to distinguish temporal and spatial effects. Arctic Europe is a most convenient place to study the aurora. Many instruments and research facilities have been placed here. The Network for Groundbased Optical Auroral Research in the Arctic Region is supported by the Nordic Council of Ministers and consists of all research institutions in northern Norway, Sweden, Finland and on theKola Peninsula active in optical auroral research. This reportintroduces optical aurora and optical research methods, research institutions and research infrastructure. It also describes the activities of the network: workshops, mobility programme and scientific results.
Download or read book Rocket Optical Observation of a Day time Aurora written by S. M. Silverman and published by . This book was released on 1965 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rocket Investigation of the Aurora Borealis written by Truman David Parkinson and published by . This book was released on 1969 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electron Transport and Optical Emissions in the Aurora written by Dirk Lummerzheim and published by . This book was released on 1987 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multispectral Auroral Imager and Optical Flow in Aurora written by Josef Höök and published by . This book was released on 2006 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book TemaNord written by Network for Groundbased Optical Auroral Research in the Arctic Region and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time dependent Electron Transport and Optical Emissions in the Aurora written by Laura Marie Peticolas and published by . This book was released on 2000 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis presents the first time-dependent transport model of auroral electrons. The evolution of the spherical electron intensity in phase space is studied for a variety of incident electron intensities. It is shown that the secondary electrons with energies 10eV and at altitudes 150 km can take over 300 ms to reach steady state in phase space. Since there are bright optical emissions in this region, such a time dependence in the auroral electrons is important. The emissions of N2(2PG) 3371 Å and N2+(1NG) 4278 Å are studied for time-varying electron pulses to show for the first time that this ratio will change until the secondary electrons reach steady state in the ionosphere. The way in which the 3371Å/4278Å ratio changes with time-varying precipitation depends on the precipitating electron spectra. The changes in the emission ratio can be used to learn more about the auroral acceleration region and the role of the ionosphere in auroral emissions. Field-aligned bursts (FABs), often observed in electron spectra of instruments flying over flickering aurora, are modeled with the time-dependent transport model. How the ionosphere modifies these electrons is shown. The 3371 and 4278 Å emissions of flickering FABs are modeled to study the optical effects of modulated electron intensities in time. A study of 4278 Å emissions for electron source regions from 630 to 4,000 km are studied along with frequency variations from 5 to 100 Hz. This study shows that the percent variation of the maximum to the minimum column brightness is less for higher frequencies and more distant source regions. It is shown that with an accurate time-dependent transport calculation and 4278 Å emission observations of flickering aurora it should be possible to deduce the source altitude of the modulated electrons creating the optical flickering"--Leaf iii.
Download or read book Optical Studies of Proton Aurora written by Fred Sigernes and published by . This book was released on 1996 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Measurements in Hydrogen Aurora written by John Ralph Miller and published by . This book was released on 1969 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Information Processing and Holography written by W. Thomas Cathey and published by John Wiley & Sons. This book was released on 1974-04-10 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rocket Optical Observation of a Day time Aurora written by Sam M. Silverman and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The preliminary results of a rocket optical observation of a day-time auroral event at Fort Churchill are reported. The variation with height of the intensity of the two lines 5577 A(OI) and 4278 A N2(+) are given and compared with a similar measurement of 5577 A line in the day airglow at White Sands. (Author).
Download or read book Optics in the Air written by Joseph A. Shaw and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Most naturally occurring optical displays can be seen from an airplane, and some are best viewed while airborne. This book is an introduction to optical phenomena in the natural world - primarily in the atmosphere (or "in the air"). It follows a simple approach that can be understood and enjoyed by readers without scientific training. A variety of optical phenomena are illustrated with photographs and explained with simplified line diagrams and descriptions. These phenomena range from everyday sky and sunset colors to the elusive noctilucent clouds and aurora, as well as a whole world of too-often-ignored occurences such as sun glitter patterns on bodies of water, colorful ringed glories and coronas, rainbows that cling to the clouds below a high-flying airplane, and ice halos that spring up as an airplane passes through high-altitude ice clouds"--
Download or read book Optical Measurements of Natural Aurora in the Northern Auroral Zone from an Aircraft Platform written by W. P. Boquist and published by . This book was released on 1963 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: An auroral measurements program to study natural auroras by photographic and spectroscopic techniques was carried out. This program was performed aboard an Air Force KC-135 aircraft over Alaska. The flight missions were scheduled to coincide with the passage, overhead, of an instrumented satellite, designed to transmit radio frequency signals through the auroras in order to study the transmission properties of the auroras. When the attempt to launch the satellite failed, the radio signals transmitted by a satellite already in orbit were used. In general, results of photographic measurements were similar to those expected from typical strong auroras present at that time of year. The photographic data collected during six flight missions show structural variations of the aurora and also show that the auroral phenomena varied significantly from mission to mission. The results of the spectrographic measurements indicate the presence of most of the bands and lines generally observed in nighttime aurora. (Author).
