Download or read book Discrete VLF Emissions from the Upper Atmosphere written by Neil Mather Brice and published by . This book was released on 1964 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new mechanism for the generation of emissions by energetic electrons--the transverse-resonance plasma instability--was found. The existence of this instability depends on the electron velocity component transverse to the earth's magnetic field rather than the component along the field. The emitted signals propagate along the field in a direction opposite to the drift of the electrons. This instability is nonconvective and, as such, has an inherent advantage over mechanisms previously suggested for explaining the generation of discrete emissions. The hypothesis that discrete VLF emissions are generated by this mechanism leads to a qualitative explanation of their diurnal variation, and much additional support for this hypothesis is found in the data. All the mechanisms considered for the generation of emissions that are observed on the ground involve resonances in the interaction between energetic electrons and right circularly polarized (whistler-mode) signals propagating quasilongitudinally. An investigation is made of VLF emissions recorded by satellites. Two distinct types of signals that are observed only in satellites were found.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Digital Spectra of Artificially Stimulated VLF Emissions written by Stanford University. Stanford Electronics Laboratories and published by . This book was released on 1974 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: New features of artificially stimulated VLF emissions from the magnetosphere have been discovered by using high resolution digital spectral analysis techniques. Several hundred emissions triggered by three VLF transmitters (NAA, Omega, Siple Station, Antarctica) have been examined. The stimulated emissions initially grow at the frequency of the triggering signal. The emissions always initially rise above the frequency of the triggering signal; this rise is independent of the final slope of the emissions. The emissions characteristically show exponential growth in time with rates that vary from 25 to 250 dB/s. Growth may continue past termination of the triggering signal and appears to be independent of the emission frequency over a range of at least several hundred Hz. The growth also may cease prior to termination. Emission amplitudes may reach 30 dB or more above the level of the triggering signal. Studies of a limited set of the data indicate that lower growth rates are observed when emission activity is just beginning or just ending. These periods are usually characterized by falling rather than rising emissions. These observations are in good agreement with a theory that attributes the emissions to an interaction between the triggering signal and counter-streaming gyroresonant electrons.
Download or read book Atmospheric Research in Antarctica written by Neloy Khare and published by CRC Press. This book was released on 2019-11-20 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric Research in Antarctica: Present Status and Thrust Areas in Climate Change represents a panoramic view of the developments in the field of Antarctic atmospheric sciences and meteorology broadly covering geomagnetism and aeronomy, middle atmospheric studies and global and climate change studies. It includes greenhouse gases, ozone monitoring as well as very low frequency (VLF) phenomena, and space weather, Antarctic meteorology, and mathematical modeling of atmosphere and ocean processes around Antarctica. Atmospheric electricity and aerosols investigations over Antarctica along with the total solar eclipse-related studies, calibration of AWIFS Sensor, and measurements of positive ions, are also discussed. This book is aimed at researchers and graduate students in atmospheric studies, meteorology, Antarctic studies, climate change. FEATURES: Covers scientific aspects of Antarctic meteorology and atmospheric sciences under climate change scenario Contains diverse set of information with strong bearing on recent and past polar processes Presents integrated research on polar science coupled with meteorological, climatological and atmosphericsciences Thoroughly reviews geomagnetism and aeronomy, middle atmospheric studies including global and climate change studies Helps readers understand how Antarctica’s climate has changed in the past and is being affected by ‘global warming’ and how might we expect its climate to change in the future?
Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1965-03 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geomagnetic Micropulsations written by J. A. Jacobs and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of geomagnetic micropulsations has developed extremely rapidly and it is difficult to know when is an appropriate time to pause and assess the sum total of our knowledge-both observational and theoretical. There has in recent years been a tremendous increase in both the quantity and quality of data and also many theoretical ad vances in our understanding of the phenomenon. Undoubtedly there will be further progress in both areas but it seems worthwhile now to review both our knowledge and our ignorance. This book was essen tially completed by the end of April 1969 and tries to give a summary of the subject up to that time. The Earth is enclosed in the magnetosphere, a hollow carved out of the solar wind by the Earth's magnetic field. Above the ionosphere there is a very tenuous thermal plasma of partially ionized hydrogen in diffusive equilibrium with magnetic and gravitational forces, and ener getic protons and electrons that constitute the trapped Van Allen ra diation belts. Throughout this anisotropic and inhomogeneous plasma, natural and man-made electromagnetic energy propagates in a wide variety of modes and frequency bands. This book is concerned with that class of natural signals called geomagnetic micropulsations-short period (usually of the order of seconds or minutes) fluctuations of the Earth's magnetic field.
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1965-07 with total page 1698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Development Reports written by and published by . This book was released on 1968 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975-06 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electromagnetic Wave Theory written by J. C. Brown and published by Elsevier. This book was released on 2016-01-21 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: International Series of Monographs in Electromagnetic Waves, Volume 11: Electromagnetic Wave Theory, Part 1 covers the proceedings of an International Scientific Radio Union (U.R.S.I.) Symposium on Electromagnetic Wave Theory. The book contains 61 chapters that are organized into three sections. The first section presents papers about wave propagation, which includes lateral waves; terrestrial waveguides; and plane waves in dissipative media. Next, the title reviews studies about wave guides, including basic properties of periodic waveguides; theoretical investigation of non-uniform waveguides; and waves in a coaxial line partially filled with plasma. The last section covers topics about surface waves, such as a dielectric prism in the corner of overmoded waveguide; lasers and optical communication systems; and microwave and laser resonators. The text will be of great use to researchers and practitioners of disciplines that study or utilize electromagnetic wave technologies, such as electrotechnics and electrical engineering.
Download or read book Report Upper Atmosphere Geophysics written by and published by . This book was released on 1970 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1979 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book OAR Cumulative Index of Research Results written by and published by . This book was released on with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book OAR Cumulative Index of Research Results written by United States. Air Force. Office of Aerospace Research and published by . This book was released on 1965 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Upper atmosphere Physics Research in the Antarctic written by National Research Council (U.S.). Panel on Upper Atmosphere Physics and published by . This book was released on 1974 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Waves in the Magnetosphere written by A.D.M. Walker and published by Springer Science & Business Media. This book was released on 2013-03-13 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a study of plasma waves which are observed in the earth's magnetosphere. The emphasis is on a thorough, but concise, treatment of the necessary theory and the use of this theory to understand the manifold varieties of waves which are observed by ground-based instruments and by satellites. We restrict our treatment to waves with wavelengths short compared with the spatial scales of the background plasma in the mag netosphere. By so doing we exclude large scale magnetohydrodynamic phenomena such as ULF pulsations in the Pc2-5 ranges. The field is an active one and we cannot hope to discuss every wave phenomenon ever observed in the magnetosphere! We try instead to give a good treatment of phenomena which are well understood, and which illustrate as many different parts of the theory as possible. It is thus hoped to put the reader in a position to understand the current literature. The treatment is aimed at a beginning graduate student in the field but it is hoped that it will also be of use as a reference to established workers. A knowledge of electromagnetic theory and some elementary plasma physics is assumed. The mathematical background required in cludes a knowledge of vector calculus, linear algebra, and Fourier trans form theory encountered in standard undergraduate physics curricula. A reasonable acquaintance with the theory of functions of a complex vari able including contour integration and the residue theorem is assumed.
Download or read book Whistlers and Related Ionospheric Phenomena written by Robert A. Helliwell and published by Courier Corporation. This book was released on 2014-06-10 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation of whistlers and related phenomena is a key element in studies of very-low-frequency propagation, satellite communication, the outer ionosphere, and solar-terrestrial relationships. This comprehensive text presents a history of the study of the phenomena and includes all the elements necessary for the calculation of the characteristics of whistlers and whistler-mode signals. An introduction and brief history are followed by a summary of the theory of whistlers and a detailed explanation of the calculation of their characteristics. Succeeding chapters offer a complete atlas of a variety of whistlers, including those observed in satellites and those generated by nuclear explosions; the results of satellite observation of whistler-mode propagation; the method of reducing whistler data and obtaining electron density information; a full atlas of the various kinds of emissions; and an outline and comparison of the theories of generation of emissions.
