Investigation Of The Stimulation Of Ulf Waves
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| Author | : John W. Willis |
| Publisher | : |
| Total Pages | : 39 |
| Release | : 1975 |
| Genre | : |
| ISBN | : |
Download Investigation of the Stimulation of ULF Waves Book in PDF, Epub and Kindle
Two methods of artificially stimulating ultra-low-frequency (ULF) waves in the ionosphere have been investigated experimentally. Radio-frequency heating of the ionospheric-dynamo-current region has been attempted using a high-frequency transmitter and has been found to be ineffective. Pulse modulation of the U.S. Navy VLF transmitter at Cutler, Maine, has been explored as a means of stimulating geomagnetic micropulsations. In a month-long experiment the transmitter was square-wave modulated at frequencies of 0.2, 1, and 5 Hz, with a network of sensitive magnetometers employed as micropulsation detectors. Though the experimental results are not statistically conclusive, micropulsations occurred on several occasions at harmonics of the transmitter modulation frequency. It is likely that ULF waves may be stimulated by this means under magnetically quiet conditions immediately following geomagnetically active days. It is concluded that practical means of emitting ULF waves for global communications are prohibitively expensive by comparison to other alternatives in the extremely-low-frequency or higher bands.
| Author | : John R. Davis |
| Publisher | : |
| Total Pages | : 48 |
| Release | : 1973 |
| Genre | : |
| ISBN | : |
Download Magic Mode: Investigations of Artificial Stimulation of ULF Waves in the Ionosphere and Magnetosphere Book in PDF, Epub and Kindle
The report describes an investigation of the potential usefulness of the ultra-low-frequency (ULF) band for communications with deeply submerged reception terminals. The discussion begins with a comprehensive review of present knowledge about ULF propagation. Present understanding of ULF propagation modes (based on observations of naturally occurring geomagnetic micropulsations) is summarized, and those features which are of importance to potential communications systems are discussed. Emphasis is then placed on the study of potential ULF generation mechanisms between 0.2 and 5 Hz which would benefit from the naturally occurring magnetospheric amplification process that is observed to occur in that frequency band. Two possible source regions are considered for the artificial generation of ULF waves: the ionospheric dynamo and the magnetospheric proton belt. (Author Modified Abstract).
| Author | : A. C. Fraser-Smith |
| Publisher | : |
| Total Pages | : 64 |
| Release | : 1977 |
| Genre | : |
| ISBN | : |
Download Stimulation of ULF (Ultra-Low-Frequencies) Geomagnetic Pulsations by Controlled VLF (Very-Low-Frequencies) Transmissions Into the Magnetosphere Book in PDF, Epub and Kindle
This report presents the results of an investigation of a proposed method for the controlled artificial generation of ultra-low-frequency (ULF) hydromagnetic waves of class Pc 1 (0.2 to 5 Hz) in the ionosphere and magnetosphere. In this method, which is called the VLF method, a large ground-based very-low-frequency (VLF) transmitter is used to stimulate the ULF waves by injecting pulses of VLF waves into the magnetosphere. A second possible method of ULF wave generation, the peninsula method, is discussed in a companion report. Combining the theoretical and experimental results obtained during this research, it is suggested that naturally-occurring repetitive VLF activity can stimulate Pc 1 pulsation events, and it is further suggested that such VLF activity may be a major source of stimulation for Pc 1 pulsations. Thus, future experiments on ULF wave generation with ground-based VLF transmitters would probably benefit greatly if they were combined with a program of simultaneous observations of naturally-occurring VLF and ULF activity.
| Author | : Jie Ren |
| Publisher | : Springer |
| Total Pages | : 106 |
| Release | : 2019-08-14 |
| Genre | : Science |
| ISBN | : 9813293780 |
Download ULF Waves’ Interaction with Cold and Thermal Particles in the Inner Magnetosphere Book in PDF, Epub and Kindle
This thesis focuses on ULF (Ultra-low-frequency) waves' interaction with plasmasphere particles and ring current ions in the inner magnetosphere. It first reports and reveals mutual effect between ULF waves and plasmasphere using Van Allen Probes data. The differences and similarities of different ring current ions interacting with ULF waves are extensively explored using Cluster data, which provides a potential explanation for O+-dominated ring current during the magnetic storms. Furthermore, this thesis finds a method to study the phase relationship between ULF waves and drift-bounce resonant particles, and proposes that the phase relationship can be used to diagnose the parallel structure of standing wave electric field and energy transfer directions between waves and particles. The findings in this thesis can significantly promote our understanding of ULF waves' role in the dynamics of inner magnetosphere.
| Author | : Nicola Fox |
| Publisher | : Springer |
| Total Pages | : 0 |
| Release | : 2016-09-24 |
| Genre | : Science |
| ISBN | : 9781489978707 |
Download The Van Allen Probes Mission Book in PDF, Epub and Kindle
Documents the science, the mission, the spacecraft and the instrumentation on a unique NASA mission to study the Earth’s dynamic, dangerous and fascinating Van Allen radiation belts that surround the planet This collection of articles provides broad and detailed information about NASA’s Van Allen Probes (formerly known as the Radiation Belt Storm Probes) twin-spacecraft Earth-orbiting mission. The mission has the objective of achieving predictive understanding of the dynamic, intense, energetic, dangerous, and presently unpredictable belts of energetic particles that are magnetically trapped in Earth’s space environment above the atmosphere. It documents the science of the radiation belts and the societal benefits of achieving predictive understanding. Detailed information is provided about the Van Allen Probes mission design, the spacecraft, the science investigations, and the onboard instrumentation that must all work together to make unprecedented measurements within a most unforgiving environment, the core of Earth’s most intense radiation regions. This volume is aimed at graduate students and researchers active in space science, solar-terrestrial interactions and studies of the upper atmosphere. Originally published in Space Science Reviews, Vol. 179/1-4, 2013.
| Author | : Naval Research Laboratory (U.S.) |
| Publisher | : |
| Total Pages | : 486 |
| Release | : 1976 |
| Genre | : Naval research |
| ISBN | : |
Download Report of NRL Progress Book in PDF, Epub and Kindle
| Author | : |
| Publisher | : |
| Total Pages | : 364 |
| Release | : 1994 |
| Genre | : Aeronautics |
| ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, Epub and Kindle
| Author | : Mark J. Engebretson |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 1992 |
| Genre | : |
| ISBN | : |
Download A Correlative Investigation of the Propagation of ULF Wave Power Through the Dayside Magnetosphere Book in PDF, Epub and Kindle
| Author | : Kazue Takahashi |
| Publisher | : American Geophysical Union |
| Total Pages | : 374 |
| Release | : 2006-01-10 |
| Genre | : Science |
| ISBN | : |
Download Magnetospheric ULF Waves Book in PDF, Epub and Kindle
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 169. Ultra-Low-Frequency (ULF) waves pervade the magnetosphere, a region shaped by the Earth's magnetic fieid and filled with an ionized gas known as plasma. As a mechanism for interaction of particles with fields and as a diagnostic tool for probing the structure of the magnetosphere, ULF waves are a rich medium for research and discovery. With new spacecraft and computer simulations, and ground-based magnetometers and radar networks, we have recently expanded our capacity to analyze ULF waves on a global scale with unprecedented precision. Magnetospheric ULF Waves: Synthesis and New Directions presents state-of-the-art information on ULF waves, and their effect on space weather, from three vantage points: Excitation and propagation Interaction with plasma and energetic particles Magnetospheric diagnostics Scientists, researchers, and students working in space physics, magnetospheric physics, atmospheric physics, climatoiogy and aeronomy will find this book an important resource for current and near-future investigations of the Sun-Earth relationship.
| Author | : National Aeronautics and Space Administration (NASA) |
| Publisher | : Createspace Independent Publishing Platform |
| Total Pages | : 32 |
| Release | : 2018-08-09 |
| Genre | : |
| ISBN | : 9781724985408 |
Download A Correlative Investigation of the Propagation of Ulf Wave Power Through the Dayside Magnetosphere Book in PDF, Epub and Kindle
Work performed from 1 Jan. - 30 Jun. 1992 is reported. The topics covered include the following: the radial pulsation study, the wave polarization study; radial boundaries of Pc 3-4 pulsations in the dayside magnetosphere; and source regions for correlated ULF-VLF pulsations. Engebretson, Mark J. Unspecified Center NASA-CR-191809, NAS 1.26:191809 NAGW-1567...
