Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm41b1189m&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM41B-1189
Physics
2704 Auroral Phenomena (2407), 2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471)
Scientific paper
The Cluster Wideband Data (WBD) instrument has been used to study the characteristics of a very narrowband, striated AKR burst emission with negative drifting structure on frequency-time plots. SAKR bursts, previosuly repoted by Menietti et al (2000), are a relatively rare form of AKR (<1% duty cycle at 125 kHz). We find that drift rates are almost always negatively sloped between 3 - 12 KHz, and that the instantaneous bandwidth is much narrower than commonly observed AKR, typically 25 - 40 Hz. By comparing burst intensities received simultaneously from widely separated spacecraft, we determine the characteristic angular size of the individual bursts: The mean angular size is statistically well determined, with a Gaussian equivalent width of 4.2° ± 0.5°. Combining this result with the measured flux density of the bursts, the mean power in `elementary radiation events' is 10 -100 W, much lower than predicted in current models of AKR emission. We suggest that SAKR emission is triggered by solitary ion structures which a moving upward at speeds 50 - 250 km/s. Both the derived speeds, directions, and implied small scales sizes are consistent with the observed properties of ion solitary structures.
Christopher Ian
Menietti D.
Mutel Robert
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