Download or read book Airborne and Ground Based Lightning Electric and Magnetic Fields and VHF Source Locations for a Two Stroke Ground Flash written by M. A. Uman and published by . This book was released on 1983 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have reduced and analyzed the data from a two-stroke lightning flash to ground which occurred in South Florida on July 16, 1981, within a network of four ground stations instrumented for VHF measurements, about 15 km from a ground station instrumented for wide-band electric field measurements, and within 10 km of a WC-130 aircraft operating at 5.2 km and instrumented for wide-band electric and magnetic field measurements. The four-station ground-based VHF measurements allow a reconstruction of the geometry of the flash, which was composed of two separate channels to ground. Electric field system bandwidth for the ground measurement was from 0.02 Hz to about 2 MHz; electric and magnetic field system bandwidths on the aircraft extended to 20 MHz. Ground-based and airborne measurements of fields are presented and shown to be consistent with one another. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Key to Lightning Technology written by and published by . This book was released on 1984 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Wideband Airborne Ground Lightning Flash Location System written by E. Coleman and published by . This book was released on 1983 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A standard video display output shows the location of thunderstorms by displaying the rate of lightning stroke activity. As new lightning strokes are received, the display intensifies on the CRT to show the center of the electrical activity. This provides a display of severe electrical storms similiar to the standard radar reflectivity displays. The lightning stroke data is integrated for four minutes. As the number of lightning strokes diminishes, the display decreases in brightness. A standard serial interface provides remote control and monitor capability. For the ground and airborne test programs, the serial channel is used to record all lightning data on a magnetic tape for later retrieval and display. Accurate direction findings is determined by utilizing only the peak pulses of the wideband return stroke waveform. The range estimation from a single station to each lignthing stroke uses the differences between the decay of electric and magnetic fields. A single antenna unit consisting of two orthogonal wideband magnetic cross-loops and a short vertical monopole antenna. The system has adequate bandwidth (3 MHz) to detect return stroke pulses for accurate direction finding and ranging. The system has a maximum range of 120 nm radius. Tests on a number of lightning storms at distances to 75 nm indicate the angular resolution is better than + or - 10 deg and may be in the range of less than 3 deg with little or no systemmatic dependence on the number of active thunderstorm cells which are at different angles.
Download or read book Lightning written by Vladimir A. Rakov and published by Cambridge University Press. This book was released on 2007-01-08 with total page 1485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lightning: Physics and Effects is the first book that covers essentially all aspects of lightning, including lightning physics, lightning protection and the interaction of lightning with a variety of objects and systems as well as with the environment. It is written in a style that will be accessible to the technical non-expert and is addressed to anyone interested in lightning and its effects. This will include physicists, engineers working in the power, communications, computer and aviation industries, meteorologists, atmospheric chemists, foresters, ecologists, physicians working in the area of electrical trauma and architects. This comprehensive reference volume contains over 300 illustrations, 70 tables containing quantitative information and a bibliography of more than 6000 references.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1992 with total page 1720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lightning Electromagnetics written by Robert Gardner and published by Routledge. This book was released on 2017-11-22 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: A survey of theoretical and experimental research, this book covers all areas of lightning phenomenology. The four sections cover models of fundamental lightning processes, propagation of lightning-induced signals, measurement of lightning parameters, and lightning interaction with systems. The book provides an excellent review of the use of models to support remote sensing efforts. It includes data on high-frequency radiated fields for lightening and an overview of the data available in the frequency and time domains for lightning. The book also presents spectoral and temporal characteristics of lightning in the VHF-UHF frequency range and uses photographic and electromagnetic measurements to examine how lighting chooses a strike point.
Download or read book The Electrical Nature of Storms written by D. R. MacGorman and published by Oxford University Press, USA. This book was released on 1998 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid progress during the last twenty years has created a host of new technologies for studying electrical storms, including lightning mapping systems, new radars, satellite sensors, and new ways of measuring electric field and particle charge. This book explains how these advances have revolutionized our understanding. The books provides substantial background material, making it accessible to a broad scientific audience.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1992 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1984 with total page 1528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Airborne Lightning Characterization written by P. L. Rustan and published by . This book was released on 1983 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: A WC-130 aircraft was instrumented with eleven electric and magnetic field sensors at different locations. The aircraft was flown in the vicinity of active thunderstorms at altitudes between 1500 and 16000 feet mean sea level (MSL). To correlate the electric fields produced by the lightning flashes and the respective location of the flashes, a ground station network was employed. The ground network consisted of a central station where the electric field and very high frequency (VHF) radiation were measured and four remote stations arranged in a wye configuration with a 20 kilometer (km) radius for measuring VHF. Fourteen channels of continuous analog data with 2 Mega hertz (MHz) bandwidth and ten channels of digital data of 164 microsecond (micro sec) windows with 20 MHz bandwidth at a maximum rate of two data windows per second were recorded in the aircraft. Analog data for the electric field and VHF radiation with 2 MHz bandwidth were recorded at the central ground site. In addition, VHF radiation with 2 MHz bandwidth were recorded at the central ground site. In addition, VHF radiation with 4 MHz bandwidth was recorded in modified video cassette recorders at all four ground sites. IRIG-B time code received at the ground site was retransmitted to the aircraft and remote stations and used for time synchronization. The aircraft and ground sensors were calibrated to detect lightning flashes between zero and 35 km away.
Download or read book Lightning Technology written by and published by . This book was released on 1981 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Conference Publication written by and published by . This book was released on 1981 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Meteorological and Environmental Inputs to Aviation Systems written by Dennis W. Camp and published by . This book was released on 1988 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1993 with total page 1146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lightning Propagation and Ground Attachment Processes from Multiple station Electric Field and X ray Measurements written by Joseph Sean Howard and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The Multiple Station Experiment/Thunderstorm Energetic Radiation Array (MSE/TERA) network operating at the International Center for Lightning Research and Testing in Camp Blanding, FL has been used to examine the close RF electric and magnetic field and X-ray environment of cloud-to-ground lightning over a period from 2005 to 2007. Data were obtained for 18 natural and 9 rocket-triggered flashes that are thought to have terminated within or very near the network. The experimental system consisted of electric field sensors (bandwidth of 0.2 Hz to 3 MHz), magnetic field sensors (10 Hz to 3 MHz), dE/dt sensors (DC to 25 MHz), and Xray sensors (primary type had rise and fall times of 0.17 microseconds and 0.9 microseconds, respectively) spread around an area of about 0.5 km2, with the exact number of sensors varying from year to year. For rocket-triggered flashes, the channel-base-current was also measured (DC to 8 MHz). A subset of these measurements, consisting of eight dE/dt sensors and eight X-ray sensors, provided the network with time-of-arrival (TOA) location capabilities. This TOA network, which is the focal point of the present analyses, was used to investigate the spatial and temporal relationship between leader X-ray sources and electric-field-change sources as well as the role of post-leader processes in the production of X rays. The dE/dt portion of the TOA system was also 16 used to track and identify low-altitude processes occurring during the leader phase, attachment process, and return stroke with a higher degree of accuracy than previously possible with similar systems. A comparison of the collected waveforms, combined with these source locations, is used to obtain new insights into some of the more perplexing aspects of lightning, such as the step-formation process, leader propagation near ground, and the attachment process.
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt:
