Electron signatures and Alfvén waves

Details Electron signatures and Alfvén waves Electron signatures and Alfvén waves

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1244a&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A9, pp. SMP 15-1, CiteID 1244, DOI 10.1029/2001JA900096

Physics

Plasma Physics

14

Magnetospheric Physics: Auroral Phenomena (2407), Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Wave/Particle Interactions, Ionosphere: Particle Acceleration, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions

Scientific paper

We identify two distinct electron populations associated with Alfvén 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 Alfvén 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 Alfvén 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 Alfvén wave can explain the observed particle signatures. It is shown that the Alfvén 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.

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