Fast earthward flows, electron cyclotron harmonic waves, and diffuse auroras: Conjunctive observations and a synthesized scenario

Details Fast earthward flows, electron cyclotron harmonic waves, and diffuse auroras: Conjunctive observations and a synthesized scenario Fast earthward flows, electron cyclotron harmonic waves, and diffuse auroras: Conjunctive observations and a synthesized scenario

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11612220l&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A12, CiteID A12220

Physics

3

Ionosphere: Wave/Particle Interactions (7867), Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere: Outer, Magnetospheric Physics: Plasma Convection (2463), Magnetospheric Physics: Plasma Waves And Instabilities (2471)

Scientific paper

We present in this paper multi-instrumental observations and analyses of fast earthward flows, electrostatic electron cyclotron harmonic (ECH) waves, and diffuse auroras, during 8-9 UT on February 5, 2009. The event began with a series of fast earthward flows detected on mid-tail probe THEMIS-C. Subsequently, magnetic dipolarizations and strong ECH wave intensifications were observed on THEMIS-D/E probes at L ˜ 11 in the equatorial plasma sheet. Concurrently, Ground optical instruments detected diffuse auroral intensifications in the region surrounding the ionospheric footprints of the THEMIS probes. Together with the theoretical simulation performed by Ni et al. (2011e), we establish a causal conjunction between the ECH waves and diffuse auroras for the reported event. We also propose that the ECH wave and diffuse auroral intensification were likely triggered by the fast flow activity from the mid-tail and its resulting magnetic dipolarization. We discuss possible mechanisms linking the fast flow and its associated dipolarization to the intensification of ECH wave and diffuse aurora in the outer magnetosphere.

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