Bounce Resonant Instabilities of Kinetic Alfvén Waves on Auroral Field Lines

Details Bounce Resonant Instabilities of Kinetic Alfvén Waves on Auroral Field Lines Bounce Resonant Instabilities of Kinetic Alfvén Waves on Auroral Field Lines

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm51a1273l&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM51A-1273

Computer Science

Sound

2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431), 7827 Kinetic And Mhd Theory, 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Recent observations from the FAST satellite as well as a number of sounding rocket missions have shown two distinct modes of auroral electron acceleration: the classic inverted-V signature consisting of a beam broad in pitch angle but narrowly confined in energy, and a lower energy, field-aligned acceleration that has been attributed to kinetic Alfvén waves. Moreover, observations indicate that these two particle populations often co-exist, suggesting that Alfvénic acceleration can occur on field lines with a quasi-static potential drop. Electrons of appropriate energy and magnetic moment can be trapped between this potential drop and their magnetic mirror points. Calculations indicate that trapped electrons of a few hundred electron volts have bounce periods of 1-5 seconds, comparable to the period of waves in the ionospheric Alfvén resonator, a structure produced by the gradients in the Alfvén speed above the auroral ionosphere. This suggests that a bounce resonant instability may occur that would excite waves in the resonator that could play a role in the acceleration of low-energy field-aligned electrons. A non-local kinetic theory including trapped electrons has been developed to determine what role such bounce resonance plays in the auroral acceleration process.

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