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Monday, April 20, 2020 | History

3 edition of A mechanism for magnetospheric substorms found in the catalog.

A mechanism for magnetospheric substorms

Gary M. Erickson

A mechanism for magnetospheric substorms

  • 276 Want to read
  • 40 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Convection.,
  • Earth ionosphere.,
  • Magnetic flux.,
  • Magnetic storms.,
  • Magnetospheric instability.,
  • Plasma layers.

  • Edition Notes

    StatementG.M. Erickson, M. Heinemann.
    SeriesNASA contractor report -- NASA CR-199342.
    ContributionsHeinemann, Michael., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15419797M


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A mechanism for magnetospheric substorms by Gary M. Erickson Download PDF EPUB FB2

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

A mechanism of the Earth's magnetospheric substorm is proposed. It is suggested that the MHD waves may propagate across the magnetopause from the magnetosheath into the magnetotail and will be dissipated in the plasma sheet, heating the plasma and accelerating the by: 1.

A MECHANISM FOR MAGNETOSPHERIC SUBSTORMS G. Erickson Center for Space Physics, Boston University, Boston, Massachusetts M. Heinemann Phillips Laboratory/GPSG, Hanscom AFB, Massachusetts Abstract Energy-principle analysis performed on two-dimensional, self-consistent solutions for magnetospheric convection in.

Planet. Space Sei.Vol. 20, pp. to Pergamon Press. Printed in Northern Ireland ON THE PHYSICAL MECHANISM OF THE MAGNETOSPHERIC SUBSTORM DEVELOPMENT A. KROPOTKIN Institute of Nuclear Physics, Moscow State University, Moscow, USSR (Received in final form 20 January ) Abstract phenomenological model of the plasma flow at the inner edge of the Cited by: 8.

Substorms at Earth and in Space On Earth the most visible sign of a substorm is a great increase of polar auroras in the midnight auroral zone. At ordinary times, quiescent auroral arcs are often seen there, but following the onset of a substorm, they intensify, move rapidly (mostly poleward) and expand, until they may cover much of the sky.

About this book Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume This volume on Magnetospheric Substorms is a compilation of papers invited and contributed to the Chapman Conference on Magnetospheric Substorms held September 3–7,in.

The effects of the magnetosphere on the aurora, and on the magnetic field observed at the ground, are described, and the way they change during magnetospheric storms is discussed.

However, it was found that their complexity began to unfold when the concept of the auroral substorm was introduced. In a book entitled Polar and Magnetospheric Substorms, the predeces­ sor to this book, I tried to describe the auroral phenomena as completely as possible in.

The concept of the magnetospheric substorm and its manifestation in the polar upper atmosphere, the polar substorm, has rapidly crystallized during the last few years.

We can find a hint of such a concept in the term 'polar elementary storm' introduced by Kristian Birkeland as early as Search for an onset mechanism that operates for both CMEs and A mechanism for magnetospheric substorms, Phys.

Plasmas, 5, Book Review: Plasma astrophysics (Saas-Fee 24th. Multipoint satellite observations indicate the development of thin current sheets and an impulsive intensification of the cross-tail current density in the growth phase at near-earth distances during a short interval (Cited by: I ‘magnetospheric substorm’ in recognition of’ Aka- ~ofu’s work, and because the events really appear to be a component of storm disturbance.

AKAS~EU () used this term in the title of his book which described all of the phcnomcna known to occur during substorms.

SUBSTORM OBSERVATIONS. Understanding the physics of magnetospheric substorms remains a high priority in modern space physics. In this section, we will examine only one aspect of substorm dynamics in which IMAGE will be able to increase our understanding.

Substorms. Animations by Walt Feimer Released on Janu This animation shows a magnetospheric substorm, during which the reconnection causes energy to be rapidly released along the field lines causing the auroras to brighten.

Download. x Frames: x_16x9_p. Lesson 4: Magnetospheric substorms imply any generation mechanism, it just addresses diversion from the perpendicular to the parallel current. For the current to be diverted accordig to eq.

(), it is necessary that contours of constant pressure p and constant flux. On occasion, solar wind energy enters Earth's magnetosphere yet the common discrete energy-dissipation events known as magnetospheric substorms fail to occur.

During these times, the magnetotail assumes a configuration where earthward of about 12 Re the tail remains in a stretched tail-like state with a thin current sheet similar to the. the multiscale ionospheric responses to substorms but also provide a theoretical guidance and cautions for the interpretation of various substorm observational data.

Introduction Since the concepts of auroral substorms [Akasofu, ] and magnetospheric substorms [Akasofu, ] were first proposed. The Influence of Temperature Anisotropies in Controlling the Development of Magnetospheric Substorms.

Winglee and E. Harnett Department of Earth and Space Sciences University of Washington Seattle, WA Submitted May Abstract Ion anisotropies can affect a host of processes within the magnetosphere, from modifying theCited by: 2. This animation shows a magnetospheric substorm, during which the reconnection causes energy to be rapidly released along the field lines causing the.

We examined one of those substorms in some detail showing that it had the expected signatures of a magnetospheric substorm. ENA observations and in situ measurements show that the substorms clearly do provide a mechanism for transporting energetic ions from the magnetotail to the inner by: Dynamics of the magnetosphere: proceedings of the A.G.U.

Chapman Conference 'Magnetospheric Substorms and Related Plasma Processes' held at Los Alamos Scientific Laboratory, Los Alamos, N.M., U.S.A., October/ edited by S Comparison Between Radiation Belt Content and Substorms. Figure 1 provides an overview of the data used in this study and shows (a) the total radiation belt electron content, (b) the 3 h mean of the SML index, and (c) the 3 h mean of SYM‐H between 1 January and 31 December inclusive.

It is these data that we will use throughout this by: Now the challenge is to comprehend the vast amount of complicated measurements made in this magnetosphere-ionosphere sysstem of the Earth. This book addresses the electrical coupling between the hot, but dilute, magnetospheric plasma and the cold, but dense, plasma in the ionosphere.

To understand the nature of a geomagnetic substorm, also known as a magnetospheric substorm, it's helpful to start at the very beginning: The Earth has its own magnetic field.

The Earth's core is composed of iron and nickel. This metal core acts as a bar magnet -- that's why you can navigate with a magnetism-based iron-nickel core is basically a magnet with two poles, one that Author: Julia Layton. Magnetospheric substorms Magnetospheric substorms McPherron, Robert L.

MAGNETOSPHERIC SUBSTORMS Robert L. McPherron Institute of Geophysics and Planetary Physics, University of California, Los Angeles occur in the Abstract. A magnetospheric substorm is a transient proceso initiated on the night side of the earth, in which a significant amount of energy.

ENERGETIC ELECTRON TRANSPORT IN THE INNER MAGNETOSPHERE DURING GEOMAGNETIC STORMS AND SUBSTORMS: FINAL RESEARCH REPORT Prepared by D. McKENZIE and P. ANDERSON Space Science Applications Laboratory Laboratory Operations 15 February Engineering and Technology Group THE AEROSPACE CORPORATION El Segundo, CA.

Additional graphics illustrate concepts of magnetic field line reconnection and magnetospheric substorms. In addition to these web pages, NSSDC also has newly included in its ftp distribution area many of the magnetospheric magnetic field model codes previously accessible from the ISTP computers.

Buy Polar and Magnetospheric Substorms: Volume 11 (Astrophysics and Space Science Library) Softcover reprint of the original 1st ed. by Syun-Ichi Akasofu (ISBN: ) from Amazon's Book Store. Everyday low prices and free delivery on eligible orders.

The reconnection of magnetic fields is one of the most fascinating processes in plasma physics, responsible for phenomena such as solar flares and magnetospheric substorms.

The concept of reconnection has developed through recent advances in exploring the magnetospheres of the Sun and Earth through theory, computer simulations and spacecraft. The Dynamic Magnetosphere. Magnetic Substorms The Earth's magnetic environment is rarely quiet.

Now and then it experiences a magnetic storm, a disturbance of the magnetic field observable all around the globe, lasting a few days and adding appreciably to the Earth's trapped plasma. The storm is accompanied by large bright auroral displays. Other articles where Magnetospheric convection is discussed: geomagnetic field: The magnetotail current: two closed loops is called magnetospheric convection.

This mechanism, together with the more important one due to reconnection, produces the tail current system. Convection and Substorms: Paradigms of Magnetospheric Phenomenology Charles F. Kennel The magnetosphere is the region where cosmic rays and the solar wind interact with the Earth's magnetic field, creating such phenomena as the northern lights and other aurorae.

Magnetospheric Applications Dungey's Model of the Open Magnetosphere Dayside Reconnection Flux Transfer Events Nightside Reconnection Magnetospheric Substorms Magnetospheres of Other Planets and of Comets. For a given flow, there exists a critical value of R m, at which the growth rate of the magnetic field perturbation is the R m increases further, the growth rate of the large-scale magnetic fields decreases to zero, implying that a finite magnetic diffusivity (finite conductivity) of the fluid is necessary for dynamo action.

This type of dynamo is often called a slow dynamo, to. Avalanche Models of Magnetospheric Substorms The most intense geomagnetic storms are almost always triggered by the impact of solar ejecta on the dayside magnetosphere.

However, there also exist a class of geoeffective phenomena, known as substorms, that do not appear correlated with the arrival of strong disturbances in the solar wind.

auroral observations through the concept of an auroral substorm, magnetospheric substorms have continuuosly been one of the main subjects in solar-terrestrial physics. A magnetospheric substorm has three manifestations (Kennel, ): the auroral substorm (e.g. aurora breakup and expansion), the polar magneticsu bstorm (magneticd isturbances in.

hand, and the terrestrial magnetospheric manifestations of storms and the associated global upper atmospheric effects on the other (see, for example, Webb et al, ; Fuller-Rowell, et al., ).

The scenario is no different for substorms which continue to fascinate and engage the attention of magnetospheric physicists as regards the varied. Satellite Studies of Magnetospheric Substorms on AugEnergetic Electrons, Spatial Boundaries, and Wave-Particle Interactions at Ogo 5 M.

KIVELSON, T. FARLEY, AND M.P. AUBRY 1 Institute o/Geophysics and Planetary Physics. The Earth, and many planets in our solar system, are known to have magnetospheric regions around them.

Substorms in the earth’s magnetosphere: AIP Conference Proceedings: VolNo 1 MENUCited by: 2. During substorms and storms, the ionosphere was subjected to rather a significant Joule heating, and the power of precipitating energetic particles was also great. Nevertheless, there were no abnormal variations of meteoparameters in the lower atmosphere.

If there is a mechanism for the powerful magnetospheric disturbance effect on. SuperDARN observations of ionospheric convection during magnetospheric substorms A. Grocott and T. K. Yeoman Abstract: The coupled nature of the magnetosphere-ionosphere system makes measurements of ionospheric convection, such as those provided by the SuperDARN HF radars, extremely useful in diagnosing magnetospheric dynamics.