NDLI: Possible Role of ion Demagnetization in the Plasma Sheet in Auroral arc and Substorm Generation

Content Provider	Springer Nature Link
Author	Lyatsky, W. Hamza, A.M.
Copyright Year	2001
Abstract	Ion demagnetization in the plasma sheet causes the formation of field-aligned current that can trigger a magnetosphere-ionosphere coupling feedback instability, which may play an important role in substorm and auroral arc generation. Since field-aligned currents close ionospheric currents, their magnitude is controlled by ionospheric conductivity. The cause of instability is the impact of increasing upward field-aligned currents on ionospheric conductivity, which in turn stimulates an increase in the field-aligned currents. When the magnitude of these currents becomes sufficiently large for the acceleration of precipitating electrons, a feedback mechanism becomes possible. Upward field-aligned currents increase the ionospheric conductivity that stimulates an explosion-like increase in field-aligned currents. It is believed that this instability may be related to substorm generation. Demagnetization of hot ions in the plasma sheet leads to the motion of magnetospheric electrons through a spatial gradient of ion population. Field-aligned currents, because of their effect on particle acceleration and the magnitude of ionospheric conductivity, can also lead to another type of instability associated with the breaking of the earthward convection flow into convection streams. The growth rate of this instability is maximum for structures with sizes less than the ion Larmor radius in the equatorial plane. This may lead to the formation of auroral arcs with widths of the order of 10 km. This instability is able to explain many features of auroral arcs, including their conjugacy in opposite hemispheres. However, it cannot explain very narrow (less than 1 km) arcs.
Starting Page	373
Ending Page	385
Page Count	13
File Format	PDF
ISSN	00386308
Journal	Space Science Reviews
Volume Number	95
Issue Number	1-2
e-ISSN	15729672
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy, Astrophysics and Cosmology Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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Flow Bursts in the Plasma Sheet and Auroral Substorm Onset: Observational Constraints on Connection Between Midtail and Near-earth Substorm Processes

Relationship Between Substorm Auroras and Processes in the Near-Earth Magnetotail

Role of ionospheric effects and plasma sheet dynamics in the formation of auroral arcs

Role of Ionospheric Effects and Plasma Sheet Dynamics in the Formation of Auroral Arcs

Studies of the substorm on March 12, 1991: 1. Structure of substorm activity and auroral ions

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Studies of substorm on March 12, 1991: 2. Auroral electrons. Acceleration, injection, and dynamics

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Possible Role of ion Demagnetization in the Plasma Sheet in Auroral arc and Substorm Generation

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