Observations of auroral medium frequency bursts

Details Observations of auroral medium frequency bursts Observations of auroral medium frequency bursts

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10222221l&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A10, p. 22221-22232

Physics

13

Ionosphere: Plasma Temperature And Density, Ionosphere: Plasma Waves And Instabilities, Magnetospheric Physics: Auroral Phenomena, Radio Science: Ionospheric Physics

Scientific paper

Auroral medium frequency (MF) bursts are broadband impulsive radio emissions observed at ground level during the breakup phase of auroral substorms. Measurements made in northern Canada during 1995-1996 show the seasonal and local time dependencies of MF burst emissions, provide case-study evidence for a null in the MF burst spectrum near twice the ionospheric electron gyrofrequency, and establish a correlation between MF burst and impulsive auroral hiss. High time resolution measurements reveal that MF bursts occur in 100-300 μs wave packets which sometimes appear periodic having a period close to the ionospheric proton gyroperiod. The timescales of the MF burst wave packets are comparable to those of whistler solitary waves recently observed with the FAST satellite.

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