NDLI: New Perspectives on Auroral Morphology

Content Provider	Springer Nature Link
Author	Swift, Daniel W.
Copyright Year	2001
Abstract	The visual aurora takes on a variety of forms. Aurora has a tendency to appear first as very thin, highly structured forms. Over time, these tend to diffuse creating much thicker forms. It is suggested that the extreme variety of auroral forms can be understood in terms of one acceleration mechanism to produce a narrow, field-aligned beam and another process that scatters electrons into trapped orbits. The scattering is due to beam- plasma interactions that generate waves on the upper-hybrid resonance curve. These waves are effective in scattering electrons from parallel to perpendicular directions. The diffuse forms are therefore caused by precipitation of quasi-trapped electrons that have drifted from the field lines on which they were accelerated. Electrons scattered into trapped orbits may also constitute the seed population for the electron radiation belts. It is also suggested that the electron beams are accelerated by inertial Alfven waves that propagate current filaments from the turbulent region in the near-Earth plasma sheet to the auroral zone ionosphere. Electrons can be accelerated by becoming trapped in inertial Alfven waves whose phase velocity increases as they propagate toward the Earth. Specific numerical simulations that could give substance to these suggestions are proposed.
Starting Page	489
Ending Page	500
Page Count	12
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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Chapter 6 - Electrodynamics of Auroral Forms

Chapter 2 - Remote Sensing of Auroral Arcs

Auroral Radio Emissions, 1. Hisses, Roars, and Bursts

Chapter 5 - Statistics and Mapping of Auroral Features

Wave-Particle-Electric Field Synergetic Auroral Electron Acceleration

Perspectives on the Comet-Asteroid-Meteorite Link

Chapter 4 - In Situ Measurements in the Auroral Plasma

An Overview of the Fast Auroral SnapshoT (FAST) Satellite

Magnetic Field Instruments for the Fast Auroral Snapshot Explorer

New Perspectives on Auroral Morphology

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