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The Acceleration Region of Stable Auroral Arcs
KTH, School of Electrical Engineering (EES), Space and Plasma Physics. (Space and Plasma Physics)ORCID iD: 0000-0003-1270-1616
2012 (English)In: Auroral Phenomenology And Magnetospheric Processes: Earth And Other Planets, American Geophysical Union (AGU), 2012, 227-239 p.Conference paper (Refereed)
Abstract [en]

The acceleration region above stable, discrete auroral arcs is reviewed. Substantial observational evidence shows that the acceleration of auroral electrons associated with these arcs is achieved by an electric potential structure above the aurora at altitudes of around 0.5-2 R-E. The morphology, internal structure, and lifetime of the predominantly U-shaped potential structure are discussed, based on observations by a number of spacecrafts. The parallel (to the geomagnetic field) electric field component of the potential structure, which accelerates the auroral electrons, is discussed in terms of relatively recent direct observations. The most important theories for how the parallel electric field is sustained are also described. The altitude distribution predicted from the various theories is compared to observations, and briefly discussed, as well as their relation to each other.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2012. 227-239 p.
, Geophysical Monograph Series, ISSN 0065-8448 ; 197
Keyword [en]
Parallel Electric-Fields, Inertial Alfven Waves, Electrostatic Shocks, Kilometric Radiation, High-Altitude, Anomalous Resistivity, Particle-Acceleration, Aligned Currents, Potential Drops, Line Resonances
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-124742DOI: 10.1029/2011GM001179ISI: 000320090100019ScopusID: 2-s2.0-84951284185ISBN: 978-0-87590-487-0OAI: diva2:638573
Chapman Conference on the Relationship Between Auroral Phenomenology and Magnetospheric Processes, FEB 27-MAR 04, 2011, Fairbanks, AK

QC 20130731

Available from: 2013-07-31 Created: 2013-07-29 Last updated: 2013-07-31Bibliographically approved

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