First observations of flickering auroral roar

Details First observations of flickering auroral roar First observations of flickering auroral roar

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..123h&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 1, p. 123-126

Physics

5

Ionosphere: Auroral Ionosphere, Ionosphere: Plasma Waves And Instabilities, Magnetospheric Physics: Auroral Phenomena

Scientific paper

We present observations of ~10 Hz pulsations in the amplitude of an auroral roar emission. These pulsations vary in frequency from 7-11 Hz and occur in groups which last for ~1 sec with adjacent pulsation groups spaced from one to several seconds. We put forth that these pulsations reflect 7-11 Hz modulations in the distribution function of the auroral electrons, similar to those associated with flickering aurora. The radio observations provide an additional means of probing this phenomenon and in particular may put constraints on the form of modulations of the electron distribution function at the auroral roar source height of a few hundred kilometers.

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