VLF Wave-wave Interaction Experiments in the Magnetosphere PDF Download
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Author: Stanford University. Stanford Electronics Laboratories
Publisher:
ISBN:
Category : Magnetosphere
Languages : en
Pages : 222
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Book Description
Author: Stanford University. Stanford Electronics Laboratories
Publisher:
ISBN:
Category : Magnetosphere
Languages : en
Pages : 222
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Book Description
Author: H. C. Koons
Publisher:
ISBN:
Category :
Languages : en
Pages : 121
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Book Description
VLF transmission experiments were conducted from sites in North Norway during selected time periods in 1978, 1979 and 1980. Data from these experiments were collected from VLF receivers aboard the SCATHA (P78-2) and GEOS satellites and VLF receivers on the ground at various locations in Norway and Sweden. Direct signals were measured at each of the ground stations and emissions triggered by the transmissions were detected by the satellite receivers. This report documents the impedance measurements made on each of three power lines used as VLF antennas and summarizes the preliminary results from the VLF receiver data. (Author).
Author: M. C. Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
The ionosphere and the magnetosphere may be significantly modified by the injected VLF waves via the thermal filamentation instability and the excitation of lower hybrid waves. In VLF wave injection experiments performed, for example, at Siple, Antarctica, the ground based transmitters are usually operated in a pulsed-wave mode with durations of a few seconds. These VLF wave pulses were used to study coherent wave-particle interactions in the magnetosphere such as the wave amplification, the triggering of wave emissions, the induced particle precipitation etc. (see e.g., Helliwell, 1983). We show in this paper that if the transmitters are operated continuously for a few minutes, significant ionospheric and magnetospheric disturbances can be caused by the following two processes. One is the thermal filamentation of the pump wave and the other one is the excitation of lower hybrid waves.
Author: R.A. HELLIWELL
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 300
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Author: R.L. Xu
Publisher: Elsevier
ISBN: 0080535747
Category : Science
Languages : en
Pages : 223
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Book Description
Launches of several major magnetospheric research satellites (i.e., Polar, Wind, and Interball) set the scene for extensive multi-platform investigations of the Earth's plasma environment in the era of the International Solar-Terrestrial Physics Program. Exciting new results from this Program and the ongoing innovative advances to scientific instrumentation and spacecraft technology are vitally important for the international space community in preparing for future plans in the upcoming new millenium. This volume is a product of the COSPAR Colloquium held in Beijing on April 15-19, 1996 aimed to consolidate these achievements. It contains state-of-the-art articles in the four areas of modern magnetospheric techniques, namely, (1) active experiment in space, (2) innovative measurement technique, (3) multi-point observation, and (4) numerical simulation and theoretical analysis. Researchers in the space community, both novices and experts, are expected to benefit from this collection of articles.
Author: John F. Vesecky
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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Book Description
A workshop on magnetospheric wave-particle interaction sponsored by ARPA and ONR was held at Stanford Research Institute, Menlo Park, California on 11-13 July, 1972. The general view of the workshop participants was that significant wave amplification at ULF and VLF frequencies can be artificially stimulated by injecting cold plasma outside the plasmapause in the magnetosphere, and that specific military applications for such wave amplification (communications) and its assoicated particle precipitation (nuclear weapons effects) are possible. The following subjects were discussed: (1) potential military applications, (2) physics of the wave-amplifying mechanism, (3) experimental observations and current theory of ULF and VLF wave-particle interaction, and (4) design of experiments to investigate wave-particle interaction phenomena. It was also the view of the workshop participants that further research should be carried out to design an optimum experimental investigation of cold-plasma-injection phenomena. A detailed list of the necessary research topics was prepared and is included in the report. (Author).
Author: H. C. Koons
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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Book Description
During the 1973 operations of the transportable very-low-frequency (TVLF) transmitter near Anchorage, Alaska (L approx. 4), an experiment was performed to determine the effect of controlled phase changes of the transmitted wave on the magnetospherically propagated signal received in the conjugate region. At periodic intervals, the phase of the driving voltage was changed (essentially instantaneously) by 180 deg. The amplitude of the 6.6 kHz signal detected in the conjugate region went to zero and recovered with a characteristic time constant of 33 msec. This is ten times longer than the antenna current response time and is in fact comparable with characteristic electron interaction times with whistler-mode waves. Between the times at which the phase reversals occurred, the received signal was amplitude modulated. The period of the modulation was about 26 msec. An upper sideband was present in the spectrum while these pulsations were occurring. These characteristic times are in general agreement with theoretical predictions of bandwidths, growth rates, and particle trapping frequencies for whistler instabilities in the magnetosphere. Data obtained from the controlled transmissions and from lightning generated whistlers propagating in the same duct were combined to determine the plasma and wave parameters at the geomagnetic equator. Of particular interest is the level at which the magnetic field of the wave saturated. During the time period for which the data were analyzed, this was found to be 3.5 pT. (Author).
Author:
Publisher:
ISBN:
Category : Antarctica
Languages : en
Pages : 318
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Author: Robert D. Hunsucker
Publisher: Springer Science & Business Media
ISBN: 3642762573
Category : Science
Languages : en
Pages : 302
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Book Description
In the years since the pioneering efforts of Sir Edward Appleton, M. A. F. Barnett, G. Breit, and M. A. Thve, many radio techniques have been employed to investigate the terrestrial ionosphere. The purposes of this book are to exam ine the basic physical interaction process of radio waves with the ionosphere, scrutinize each of the radio techniques currently in use, and describe the elements of each technique, as well as assess their capabilities and limitations. I have included some of the history of each technique, since we often tend to forget the efforts of the "pioneers". The interaction of radio waves with the terrestrial ionosphere has been described in considerable detail in several "classic" treatments, e.g., Ratcliffe (1959), Al'pert (1963), Budden (1961) and Davies (1965), Rishbeth and e.g., Flock (1979), Davies Garriott (1969), and in other more recent books, (1990), Hargreaves (1979), and Budden (1985). A few of the radio techniques have been described by Hargreaves (1979) and a book by Giraud and Petit (1978) has also included discussion of several of the techniques. The "WITS" handbook No. 2 (1989) also contains description of several radio techniques.
