Observations of auroral broadband emissions by CLUSTER

Details Observations of auroral broadband emissions by CLUSTER Observations of auroral broadband emissions by CLUSTER

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30k..17w&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 11, pp. 17-1, CiteID 1563, DOI 10.1029/2002GL016335

Physics

4

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Electric Fields (2411)

Scientific paper

We present the results of a study based on several events of broadband ULF/ELF emissions observed in the auroral region by the CLUSTER multi-spacecraft at distances around 4-5 RE. These emissions, observed below the ion plasma frequency, are similar to the broadband emissions observed at lower altitudes (800-4000 km) by rockets (e.g. AMICIST) and satellites (e.g. FREJA and FAST). As successive passages of the four CLUSTER satellites through nearly the same regions show, the intensity of the emissions depend on the thermal properties of the plasma and gradients thereof. The total Poynting flux is downward and is comparable to energy fluxes observed at lower altitudes. We believe the broadband emissions are the result of dispersed Alfvén waves (DAW), which propagates down the magnetic field lines, and emits higher frequency ion plasma wave modes.

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