Cluster observations of whistler mode ducts and banded chorus

Details Cluster observations of whistler mode ducts and banded chorus Cluster observations of whistler mode ducts and banded chorus

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3818107h&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 18, CiteID L18107

Physics

Plasma Physics

Magnetospheric Physics: Plasma Waves And Instabilities (2471), Radio Science: Magnetospheric Physics (2700), Radio Science: Radio Wave Propagation, Radio Science: Waves In Plasma (7867), Space Plasma Physics: Wave/Particle Interactions (2483, 6984)

Scientific paper

Bell et al. (2009) proposed that the source region for banded chorus consists of whistler mode ducts of depleted electron density (Ne) for upper band (UB) chorus for all wave normal angles ($\theta$) and ducts of either enhanced or depleted Ne for lower band (LB) chorus for small $\theta$ and $\theta$ near or greater than the Gendrin angle, respectively. This paper provides support for this model using new high resolution (17 km) Ne observations from the Cluster WHISPER and EFW instruments. Data is examined from January 20, 2004, when strong banded chorus was observed over 3000 km of the Cluster 2 orbit, ending at the magnetic equator. Previous analysis of LB chorus on this day indicated the wave normal angles were larger than the Gendrin angle. Using the Ne data, we show that the LB chorus is generated within depletion ducts in the source region and that the half-width of these ducts (˜70 km) is comparable to the transverse scale (˜100 km) of the chorus source region. Making use of the fact that the group velocity of the LB chorus waves has a significant cross-L component, we show that the source region extends over 500 km near the magnetic equator.

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