ULF Pulsations in the Magnetosphere

ULF Pulsations in the Magnetosphere
Author: D.J. Southwood
Publisher: Springer Science & Business Media
Total Pages: 154
Release: 2012-12-06
Genre: Science
ISBN: 940098426X
GET BOOK

Download ULF Pulsations in the Magnetosphere Book in PDF, Epub and Kindle

Physical and chemical studies of the earth and planets along with their sur roundings are now developing very rapidly. As these studies are of essentially international character, many international conferences, symposia, seminars and workshops are held every year. To publish proceedings of these meetings is of course important for tracing development of various disciplines of earth and plane tary sciences though publishing is getting fast to be an expensive business. It is my pleasure to learn that the Center for Academic Publications Japan and the Japan Scientific Societies Press have agreed to undertake the publication of a series "Advances in Earth and Planetary Sciences" which should certainly become an important medium for conveying achievements of various meetings to the aca demic as well as non-academic scientific communities. It is planned to publish the series mostly on the basis of proceedings that appear in the Journal of Geomagnetism and Geoelectricity edited by the Society of Terrestrial Magnetism and Electricity of Japan, the Journal of Physics of the Earth by the Seismological Society of Japan and the Volcanological Society of Japan, and the Geochemical Journal by the Geochemical Society of Japan, . although occasional volumes of the series will include independent proceedings. Selection of meetings, of which the proceedings will be included in the series, will be made by the Editorial Committee for which I have the honour to work as the General Editor.

ULF Pulsations in the Magnetosphere

ULF Pulsations in the Magnetosphere
Author: International Union of Geodesy and Geophysics
Publisher:
Total Pages: 0
Release: 1981
Genre: Geomagnetic micropulsations
ISBN:
GET BOOK

Download ULF Pulsations in the Magnetosphere Book in PDF, Epub and Kindle

Geomagnetic Micropulsations

Geomagnetic Micropulsations
Author: J. A. Jacobs
Publisher: Springer Science & Business Media
Total Pages: 187
Release: 2012-12-06
Genre: Science
ISBN: 3642868282
GET BOOK

Download Geomagnetic Micropulsations Book in PDF, Epub and Kindle

The subject of geomagnetic micropulsations has developed extremely rapidly and it is difficult to know when is an appropriate time to pause and assess the sum total of our knowledge-both observational and theoretical. There has in recent years been a tremendous increase in both the quantity and quality of data and also many theoretical ad vances in our understanding of the phenomenon. Undoubtedly there will be further progress in both areas but it seems worthwhile now to review both our knowledge and our ignorance. This book was essen tially completed by the end of April 1969 and tries to give a summary of the subject up to that time. The Earth is enclosed in the magnetosphere, a hollow carved out of the solar wind by the Earth's magnetic field. Above the ionosphere there is a very tenuous thermal plasma of partially ionized hydrogen in diffusive equilibrium with magnetic and gravitational forces, and ener getic protons and electrons that constitute the trapped Van Allen ra diation belts. Throughout this anisotropic and inhomogeneous plasma, natural and man-made electromagnetic energy propagates in a wide variety of modes and frequency bands. This book is concerned with that class of natural signals called geomagnetic micropulsations-short period (usually of the order of seconds or minutes) fluctuations of the Earth's magnetic field.

Dayside Magnetosphere Interactions

Dayside Magnetosphere Interactions
Author: Qiugang Zong
Publisher: John Wiley & Sons
Total Pages: 320
Release: 2020-03-13
Genre: Science
ISBN: 1119509629
GET BOOK

Download Dayside Magnetosphere Interactions Book in PDF, Epub and Kindle

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.

Handbook of the Solar-Terrestrial Environment

Handbook of the Solar-Terrestrial Environment
Author: Yohsuke Kamide
Publisher: Springer Science & Business Media
Total Pages: 539
Release: 2007-08-17
Genre: Science
ISBN: 3540463151
GET BOOK

Download Handbook of the Solar-Terrestrial Environment Book in PDF, Epub and Kindle

As a star in the universe, the Sun is constantly releas- cover a wide range of time and spatial scales, making ?? ing energy into space, as much as ?. ? ?? erg/s. Tis observations in the solar-terrestrial environment c- energy emission basically consists of three modes. Te plicated and the understanding of processes di?cult. ?rst mode of solar energy is the so-called blackbody ra- In the early days, the phenomena in each plasma diation, commonly known as sunlight, and the second region were studied separately, but with the progress mode of solar electromagnetic emission, such as X rays of research, we realized the importance of treating and UV radiation, is mostly absorbed above the Earth’s the whole chain of processes as an entity because of stratosphere. Te third mode of solar energy emission is strong interactions between various regions within in the form of particles having a wide range of energies the solar-terrestrial system. On the basis of extensive from less than ? keV to more than ? GeV. It is convenient satellite observations and computer simulations over to group these particles into lower-energy particles and thepasttwo decades, it hasbecomepossibleto analyze higher-energy particles, which are referred to as the so- speci?cally the close coupling of di?erent regions in the lar wind and solar cosmic rays, respectively. solar-terrestrial environment.

ULF Waves in the Low-Latitude Boundary LAyer and Their Relationship to Magnetospheric Pulsations: A Multisatellite Observation

ULF Waves in the Low-Latitude Boundary LAyer and Their Relationship to Magnetospheric Pulsations: A Multisatellite Observation
Author:
Publisher:
Total Pages: 25
Release: 1994
Genre:
ISBN:
GET BOOK

Download ULF Waves in the Low-Latitude Boundary LAyer and Their Relationship to Magnetospheric Pulsations: A Multisatellite Observation Book in PDF, Epub and Kindle

On April 30 (day 120), 1985, the magnetosphere was compressed at 0923 UT and the subsolar magnetopause remained near 7 RE geocentric for approx. 2 hours, during which the four spacecraft Spacecraft Charging At High Altitude (SCATHA), GOES 5, GOES 6, and Active Magnetospheric Particle Tracer Explorers (AMPTE) CCE were all in the magnetosphere on the morning side. SCATHA was in the low-latitude boundary layer (LLBL) in the second half of this period. The interplanetary magnetic field was inferred to be northward from the characteristics of precipitating particle fluxes as observed by the low-altitude satellite Defense Meteorological Satellite Program (DMSP) F7 and also from absence of substorms. We used magnetic field and particle data from this unique interval to study ULF waves in the LLBL and their relationship to magnetic pulsations in the magnetosphere. The LLBL was identified from the properties of particles, including bidirectional field-aligned electron beams at approx. 200 eV. In the boundary layer the magnetic field exhibited both a 5-10 min irregular compressional oscillation and a broadband (Delta(f)/f approx. 1) primarily transverse oscillations with a mean period of approx. 50 s and a left-hand sense of polarization about the mean field. The former can be observed by other satellites and is likely due to pressure variations in the solar wind, while the latter is likely due to a Kelvin-Helmoltz (K.-H.) instability occurring in the LLBL or on the magnetopause.

Hydromagnetic Waves in the Magnetosphere and the Ionosphere

Hydromagnetic Waves in the Magnetosphere and the Ionosphere
Author: Leonid S. Alperovich
Publisher: Springer Science & Business Media
Total Pages: 437
Release: 2007-12-05
Genre: Science
ISBN: 1402066376
GET BOOK

Download Hydromagnetic Waves in the Magnetosphere and the Ionosphere Book in PDF, Epub and Kindle

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.

Stimulation of ULF (Ultra-Low-Frequencies) Geomagnetic Pulsations by Controlled VLF (Very-Low-Frequencies) Transmissions Into the Magnetosphere

Stimulation of ULF (Ultra-Low-Frequencies) Geomagnetic Pulsations by Controlled VLF (Very-Low-Frequencies) Transmissions Into the Magnetosphere
Author: A. C. Fraser-Smith
Publisher:
Total Pages: 64
Release: 1977
Genre:
ISBN:
GET BOOK

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.

Electric Field in the Ionosphere

Electric Field in the Ionosphere
Author: Hari K. Sen
Publisher:
Total Pages: 28
Release: 1968
Genre: Electric fields
ISBN:
GET BOOK

Download Electric Field in the Ionosphere Book in PDF, Epub and Kindle

The anomalously high electron temperature in the lower ionosphere (E-region) cannot be attributed to photoelectrons (Spencer and Brace, 1965). In this report, it is shown that electric fields due to charge separation in the dynamo region provide adequate energy for this purpose. Application of the formula for the velocity distribution of the electrons in crossed electric and magnetic fields (Sen and Wyller, 1960) to the observational data gives electric fields perpendicular to the magnetic field of intensity about 20 to 40 V/km. This is an order of magnitude higher than that obtained in the current dynamo theory. A theory of the origin of the electric field in charge separation due to neutral wind drag is given. The theory leads to the right order of magnitude estimate of the dimensions of ionospheric irregularities. Another likely source for the electric field is where the solar wind meets the magnetosphere (magnetopause). It is shown that a field approx. 1 V/m can build up in the magnetospheric plasma sheath, as in a discharge tube, and be conducted down into the ionosphere along the lines of magnetic force. It is further shown that an electric field of this magnitude can cause the requisite auroral particle acceleration and sheath current for the main phase of magnetic storms. (Author).

Plasma Waves in the Magnetosphere

Plasma Waves in the Magnetosphere
Author: A.D.M. Walker
Publisher: Springer Science & Business Media
Total Pages: 355
Release: 2013-03-13
Genre: Science
ISBN: 3642778674
GET BOOK

Download Plasma Waves in the Magnetosphere Book in PDF, Epub and Kindle

This book is a study of plasma waves which are observed in the earth's magnetosphere. The emphasis is on a thorough, but concise, treatment of the necessary theory and the use of this theory to understand the manifold varieties of waves which are observed by ground-based instruments and by satellites. We restrict our treatment to waves with wavelengths short compared with the spatial scales of the background plasma in the mag netosphere. By so doing we exclude large scale magnetohydrodynamic phenomena such as ULF pulsations in the Pc2-5 ranges. The field is an active one and we cannot hope to discuss every wave phenomenon ever observed in the magnetosphere! We try instead to give a good treatment of phenomena which are well understood, and which illustrate as many different parts of the theory as possible. It is thus hoped to put the reader in a position to understand the current literature. The treatment is aimed at a beginning graduate student in the field but it is hoped that it will also be of use as a reference to established workers. A knowledge of electromagnetic theory and some elementary plasma physics is assumed. The mathematical background required in cludes a knowledge of vector calculus, linear algebra, and Fourier trans form theory encountered in standard undergraduate physics curricula. A reasonable acquaintance with the theory of functions of a complex vari able including contour integration and the residue theorem is assumed.