Propagation Effects of Very Low Frequency Radio Waves - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Propagation Effects of Very Low Frequency Radio Waves write by Sandip K. Chakrabarti. This book was released on 2010-11-23. Propagation Effects of Very Low Frequency Radio Waves available in PDF, EPUB and Kindle. Studies of the propagation of Very Low Frequency (VLF) radio waves through the earth-ionospheric waveguide are being done for a long time. However, only recently it is being recognized that the amplitude and phase variations, especially the disturbances of the signal could be used to study varied effects such as solar flares, gamma ray bursts, soft gamma ray repeaters, seismic activities apart from the usual studies of tweeks, lighting induced electron precipitation etc. This conference, for the first time, focus the future of the subject in light of these new developments.
An Investigation of the Modal Interference of Very-low-frequency Radio Waves
An Investigation of the Modal Interference of Very-low-frequency Radio Waves - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook An Investigation of the Modal Interference of Very-low-frequency Radio Waves write by F. J. RHOADS. This book was released on 1965. An Investigation of the Modal Interference of Very-low-frequency Radio Waves available in PDF, EPUB and Kindle. A very-low-frequency (vlf) radio-wave propagation experiment has been designed to study modal interference effects and the extent of agreement with theoretical results obtained previously. The experimental data are the field strengths of the vlf transmissions from the U.S. Navy transmitting stations NPM and Haiku in Hawaii and NPG near Seattle, Washington. These data were recorded aboard an aircraft while in flight between California, Guam, and Japan, and also at a field site near Washington, D.C. During the experiment, NPM transmitted for various periods on 16.6, 19.8, 22.3, 24.0, and 26.1 kc/s. The Haiku transmissions were on 16.6 and 19.8 kc/s, while NPG was on 18.6 kc/s continuously. The experimental field-strength-versus-distance graphs show considerable modal interference and very good agreement with the theoretical results for the isotropic case. For frequencies above 20 kc/s the experimental data indicate the existence of at least the first three modes for propagation to the west and to the east, out to distances greater than 3 megameters. The data at 19.8 kc/s, however, indicate first-three-mode effects for propagation to the east but only two modes to the west. The fading of the field strengths at Washington, D.C., during sunrise was frequently greater than 20 db. The depth of the fades, in general, increased with frequency, whereas their time of occurrence was relatively independent of frequency over the range of 19.8 to 26.1 kc/s. (Author).
A Survey and Bibliography of Recent Research in the Propagation of VLF Radio Waves
A Survey and Bibliography of Recent Research in the Propagation of VLF Radio Waves - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook A Survey and Bibliography of Recent Research in the Propagation of VLF Radio Waves write by James R. Wait. This book was released on 1960. A Survey and Bibliography of Recent Research in the Propagation of VLF Radio Waves available in PDF, EPUB and Kindle.
Propagation of Radio Waves at Frequencies below 300 Kc/s
Propagation of Radio Waves at Frequencies below 300 Kc/s - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Propagation of Radio Waves at Frequencies below 300 Kc/s write by W. T. Blackband. This book was released on 2014-06-28. Propagation of Radio Waves at Frequencies below 300 Kc/s available in PDF, EPUB and Kindle. Propagation of Radio Waves at Frequencies Below 300 KC/S covers the proceedings of the Seventh Meeting at the AGARD Ionospheric Research Committee, held in Munich, Germany on September 17-21, 1962. This book is organized into eight parts encompassing 32 chapters. The first parts deal with research studies concerning the electron density distribution and some properties of the lower ionosphere, as well as the effect of D-layer irregularities on radio wave propagation. The next parts explore the low frequency propagation in the lower ionosphere, the measurement of oblique incidence, and the statistical frequency spectrum of radio noise below 300 kc/s. The remaining chapters discuss the diurnal changes, the statistical prediction, the mode theory, and the propagation of very and extremely low frequency radio waves in the ionosphere. These chapters also examine the Earth resonance. This book will prove useful to astronomers, astrophysicists, and space scientists.
The Transequatorial Propagation of Very Low Frequency Radiowaves
The Transequatorial Propagation of Very Low Frequency Radiowaves - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook The Transequatorial Propagation of Very Low Frequency Radiowaves write by Floyd Perry Snyder. This book was released on 1980. The Transequatorial Propagation of Very Low Frequency Radiowaves available in PDF, EPUB and Kindle. This study reports on observations of dawn/dusk transition fading of very low frequency radiowaves on a long, transequatorial northeasterly propagation path. A mode conversion model is developed and numerical modeling results are presented for transition fading on long transequatorial paths, both northeasterly and southwesterly. From these results the following general conclusions are drawn: (a) Anomalous transequatorial transition fading is not observed for the northeasterly propagation path. The transition fading data support completely the mode conversion model of transition fading developed by Crombie. (b) The transequatorial sunrise transition reported in the literature as anomalous is completely explained by correctly allowing for variations of the geomagnetic field along the path. The geomagnetic field influences the nighttime modal parameters to such an extent for the southwesterly path considered that the approximate WKB method of mode summation cannot be employed. (c) Careful application of model techniques appears to be capable of describing all LF and VLF propagation in the earth-ionosphere waveguide, provided the effect of the earth's magnetic field is properly included at night. However, an improved model of the ionosphere at altitudes below 100 km is desired. (Author).
