Diagnosing the excitation mechanisms of Pc5 magnetospheric flank waveguide modes and FLRs

Details Diagnosing the excitation mechanisms of Pc5 magnetospheric flank waveguide modes and FLRs Diagnosing the excitation mechanisms of Pc5 magnetospheric flank waveguide modes and FLRs

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2609m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 16, p. 2609-2612

Physics

Plasma Physics

16

Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Space Plasma Physics: Kinetic And Mhd Theory

Scientific paper

Using the theoretical results of Mann et al. [1999], we show how the characteristics of multiple field line resonances (FLRs), driven by waveguide mode harmonics, can be strongly local time dependent and how these characteristics can be used to differentiate between waves driven by solar wind stimuli or by the development of magnetopause shear flow instabilities. Using observations previously reported in the literature, we show examples of this diagnostic analysis and conclude that the dawn/dusk asymmetry in Pc5 FLR characteristics may be linked to different dominant excitation mechanisms operating either side of noon. In particular, we suggest there is a preference for dawn-side FLRs to be excited by waveguide modes which are amplified through the action of over-reflection at the magnetopause.

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