Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72d..05m&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM72D-05
Physics
2704 Auroral Phenomena (2407), 6939 Magnetospheric Physics, 6984 Waves In Plasma, 7534 Radio Emissions
Scientific paper
We have detected banded fine structure in dynamic spectra of auroral kilometric radiation (AKR) from the WBD instrument on multiple Cluster spacecraft. The banded structure consists of periodic amplitude modulation of AKR burst emission with a frequency separation close to the local proton cyclotron frequency. We have analyzed ten examples of this fine structure in the 250-262 KHz and 500-512 KHz frequency bands. The modulated AKR bursts were received on multiple Cluster spacecraft during six epochs from 20 June to 27 July 2002. The banded structure is similar to that reported by Grabbe (1982) from ISEE-1 observations, but detailed measurements of the frequency spacing show that it is systematically lower than the local proton cyclotron frequency by 5-20% at 250 KHz and 20-40% at 500 KHz. This systematic difference appears to rule out the three-wave model proposed by Grabbe. We discuss an possible alternative mechanism in which the banded structure is caused by a diffracting screen located above the AKR region.
Christopher Ian
Menietti D.
Mutel Robert L.
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