Download or read book A Conjugate Study of ULF Waves at the Cusp written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes a three year study of magnetic variations measured near the footprint of the magnetospheric cusp in conjugate hemispheres. During that time data were collected from fluxgate and induction magnetometers and compared with optical data from all sky cameras and meridian scanning photometers. The spectrum of fluctuations observed near the cusp spans a frequency range from near dc to, and above, our instrument Nyquist frequency of 50 millihertz. While the spectral power is known to diminish with frequency, there are two spectral bands which carry important information concerning the physical processes taking place along cusp field lines. In the lowest frequency band, ranging from dc to approximately 10 millihertz, are a collection of signals which show the dominant spectral power. In the central cusp there occur incoherently superposed wavelets which are observed simultaneously in both hemispheres. Our analysis, and that of our colleagues, shows these to be the resonant response of the outermost portions of the geomagnetic field near the magnetopause to the impulsive pressure variations carried by the solar wind. To the morning and evening sides of the cusp are poleward traveling pulses which appear to be line currents connecting the ionosphere with the magnetopause. We conjecture that these field aligned currents are driven by reconnection events at the magnetopause. The second important frequency band ranges from 10 millihertz to our Nyquist (and above). This band contains a collection of coherent and incoherent oscillations. The coherent oscillations are short-lived packets which are believed to be generated in the upstream solar wind. The incoherent portion of the spectrum have been shown to be due to modulated electron beams impacting the ionosphere. Modulations of the beam intensity produce a quasi-periodic modification of the ionospheric c.
Download or read book Hydromagnetic Waves in the Magnetosphere and the Ionosphere written by Leonid S. Alperovich and published by Springer Science & Business Media. This book was released on 2007-12-05 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here is a fascinating text that integrates topics pertaining to all scales of the MHD-waves, emphasizing the linkages between the ULF-waves below the ionosphere on the ground and magnetospheric MHD-waves. It will be most helpful to graduate and post-graduate students, familiar with advanced calculus, who study the science of MHD-waves in the magnetosphere and ionosphere. The book deals with Ultra-Low-Frequency (ULF)-electromagnetic waves observed on the Earth and in Space.
Download or read book Electromagnetic Coupling in the Polar Clefts and Caps written by Per Even Sandholt and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, Lillehammer, Norway, September 20-24, 1988
Download or read book Ionospheric Space Weather written by Timothy Fuller-Rowell and published by John Wiley & Sons. This book was released on 2016-12-05 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is the outcome of an American Geophysical Union Chapman Conference on longitude and hemispheric dependence of ionospheric space weather, including the impact of waves propagating from the lower atmosphere. The Chapman Conference was held in Africa as a means of focusing attention on an extensive geographic region where observations are critically needed to address some of the fundamental questions of the physical processes driving the ionosphere locally and globally. The compilation of papers from the conference describes the physics of this system and the mechanisms that control ionospheric space weather in a combination of tutorial-like and focused articles that will be of value to the upper atmosphere scientific community in general and to ongoing global magnetosphere-ionosphere-thermosphere (MIT) modeling efforts in particular. A number of articles from each science theme describe details of the physics behind each phenomenon that help to solve the complexity of the MIT system. Because this volume is an outcome of the research presented at this first space science Chapman Conference held in Africa, it has further provided an opportunity for African scientists to communicate their research results with the international community. In addition, the meeting and this conference volume will greatly enhance the space science education and research interest in the African continent and around the world. Ionospheric Space Weather includes articles from six science themes that were discussed at the Chapman Conference in 2012. These include: Hemispherical dependence of magnetospheric energy injection and the thermosphere-ionosphere response Longitude and hemispheric dependence of storm-enhanced densities (SED) Response of the thermosphere and ionosphere to variability in solar radiation Longitude spatial structure in total electron content and electrodynamics Temporal response to lower-atmosphere disturbances Ionospheric irregularities and scintillation Ionospheric Space Weather: Longitude Dependence and Lower Atmosphere Forcing will be useful to both active researchers and advanced graduate students in the field of physics, geophysics, and engineering, especially those who are keen to acquire a global understanding of ionospheric phenomena, including observational information from all longitude sectors across the globe.
Download or read book Antarctic Journal of the United States written by and published by . This book was released on 1997 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biennial Report written by University of Alaska Fairbanks. Geophysical Institute and published by . This book was released on 1997 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report to the Scientific Committee for Antarctic Research written by Australian National Committee on Antarctic Research and published by . This book was released on 1994 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Putting the I in IHY written by Barbara J. Thompson and published by Springer Science & Business Media. This book was released on 2009-11-29 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Putting the “I” in IHY This book is about international cooperation. It demonstrates how the power of scienti?c imagination and investigation can bring together people form all continents in almost all countries around the globe. In presenting this impressive result, we can understand, how much unifying force the quest for understanding our universe and using outer space for that purpose have. Astronomy is far away from being a “political” area of science. But is has enormous political effects – and all of these effects are positive. This book about the international aspects and achievements of the “International Heliophysical Year (IHY) 2007” can be regarded as a compendium of the fertile impacts of conducting research in this ?eld. The main focus, as the title implicates, is the international cooperation, which has emerged from this grassroots initiative. North and South, industrialized and developing countries have been coordinating their efforts and have been learning from each other in a mutual partnership under a joint understanding of sharing the scienti?c bene?ts. Through this, trans-border networks have been created and scienti?c as well as cultural exchange took place.
Download or read book Annales Geophysicae written by and published by . This book was released on 2004 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observations of 1 10 MHz Cusp Latitude ULF Waves written by Sean Thomas Ables and published by . This book was released on 2004 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Nagata Symposium on Geomagnetically Conjugate Studies and the Workshop on Antarctic Middle and Upper Atmosphere Physics written by 佐藤夏雄 and published by . This book was released on 1987 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ANARE Reports written by and published by . This book was released on 1984 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conjugate cusp region ULF pulsation responses to the solar wind event of May 23 1989 written by D.L. MATTHEWS and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnetospheric Research with Advanced Techniques written by R.L. Xu and published by Elsevier. This book was released on 1998-09-23 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Dayside Magnetosphere Interactions written by Qiugang Zong and published by John Wiley & Sons. This book was released on 2020-04-07 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exploring the processes and phenomena of Earth's dayside magnetosphere Energy and momentum transfer, initially taking place at the dayside magnetopause, is responsible for a variety of phenomenon that we can measure on the ground. Data obtained from observations of Earth’s dayside magnetosphere increases our knowledge of the processes by which solar wind mass, momentum, and energy enter the magnetosphere. Dayside Magnetosphere Interactions outlines the physics and processes of dayside magnetospheric phenomena, the role of solar wind in generating ultra-low frequency waves, and solar wind-magnetosphere-ionosphere coupling. Volume highlights include: Phenomena across different temporal and spatial scales Discussions on dayside aurora, plume dynamics, and related dayside reconnection Results from spacecraft observations, ground-based observations, and simulations Discoveries from the Magnetospheric Multiscale Mission and Van Allen Probes era Exploration of foreshock, bow shock, magnetosheath, magnetopause, and cusps Examination of similar processes occurring around other planets The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals. Find out more about this book from this Q&A with the editors
Download or read book The Polar Cusp written by J.A. Holtet and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings are based upon introductory talks, research reports and discussions from the NATO Advanced Workshop on the "Morphology and Dynamics of the Polar Cusp", held at Lillehammer, Norway, 7-12 May, 1984. The upper atmosphere at high latitudes is called the "Earth's win dow to outer space". Through various electrodynamic coupling process es as well as through direct transfer of particles many geophysical effects displayed there are direct manifestations of phenomena occurring in the deep space. The high latitude ionosphere will also exert a feedback on the regions of the magnetosphere and atmosphere to which it is coupled, acting as a momentum and energy source and sink, and a source of particles. Of particular interest are the sections of the near space known as the Polar Cusp. A vast portion of the earth's magnetic field envelope is electrically connected to these regions. This geometry results in a spatial mapping of the magnetospheric pro cesses and a focusing on to the ionosphere. In the Polar Cusps the solar wind plasma has also direct access to the upper atmosphere. The polar regions are thus of extreme importance when it comes to under standing the physical processes in the near space and their effect on our environment. The Introductory Talks given at this workshop provided a common background for discussing and understanding the physics of the Polar Cusp. By this book we will make the information which thus was provid ed to the participants of the workshop accessible to a wider audience.
Download or read book Magnetospheric ULF Waves written by Kazue Takahashi and published by American Geophysical Union. This book was released on 2006-01-10 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
