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Electron signatures and Alfven waves
KTH, Superseded Departments, Alfvén Laboratory.ORCID iD: 0000-0003-2422-5426
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2002 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 107, no A9Article in journal (Refereed) Published
Abstract [en]

[1] We identify two distinct electron populations associated with Alfven waves in the Freja data set using the high time resolution state of the art electron detector. One of the populations, detected together with an Alfven wave, is field-aligned and can be seen as trapped within the wave. The other electron population is detected before the wave and consists of electrons which have left the wave at a point with a velocity higher than the local Alfven speed. In the paper, the electrons leaving wave are modeled for different density profiles and are compared with the observed data. Depending on the density profile, the model can produce the same energy-time and pitch angle-time dispersion that is observed in the Freja data. The conclusion of the paper is that the Alfven wave can explain the observed particle signatures. It is shown that the Alfven wave acceleration can create electron signatures similar to inverted-V structures. The density distribution along a flux tube has an important role in the type of particle signatures that can be detected at low altitudes.

Place, publisher, year, edition, pages
2002. Vol. 107, no A9
Keyword [en]
Alfven wave, electron acceleration, FREJA SATELLITE-OBSERVATIONS, PLASMA-WAVES, AURORAL ARC, ACCELERATION, PRECIPITATION, MAGNETOSPHERE, IONOSPHERE, ENERGIZATION, DISPERSION, EMISSION
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-13440DOI: 10.1029/2001JA900096ISI: 000180343700020OAI: oai:DiVA.org:kth-13440DiVA: diva2:325345
Note
QC 20100618Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Alfven Waves and Spatio-Temporal Structuring in the Auroral Ionosphere
Open this publication in new window or tab >>Alfven Waves and Spatio-Temporal Structuring in the Auroral Ionosphere
2002 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2002. x, 41 p.
Keyword
dispersive alfrén waves, auroral particle acceleration, ionospheric alfvén resonator, auroral particle acceleration, small scale auroral structure
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-3364 (URN)
Public defence
2002-06-07, 00:00
Note
QC 20100618Available from: 2002-06-05 Created: 2002-06-05 Last updated: 2010-06-18Bibliographically approved

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Ivchenko, Nickolay

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