Microwave type III bursts and pulsation groups

Details Microwave type III bursts and pulsation groups Microwave type III bursts and pulsation groups

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...437..691n&link_type=abstract

Astronomy and Astrophysics, Volume 437, Issue 2, July II 2005, pp.691-697

Astronomy and Astrophysics

Astrophysics

6

Sun: Radio Radiation

Scientific paper

We analyse 22 continuous microwave reverse slope (RS) type III and 21 microwave pulsation groups observed by the Purple Mountain Observatory (PMO) spectrometer over the frequency range of 4.5-7.5 GHz from 1999-2003. The RS type III groups have an average of 12 bursts per group, a mean duration of 0.1-2 s around 6 GHz, a mean quasi-period of 2.0 ± 0.6 s and a mean drift rate of 7.0 GHz s-1. The shortest quasi-period is measurable down to 0.05 s thanks to the high time resolution of this instrument. The microwave pulsation groups have an average of 22 events per group, a mean duration of 3-4 s and a mean quasi-period of 3.7 ± 1.1 s. The RS type III bursts have the same quasi-period as the upward type III bursts documented before. We discuss two possible origins of the quasi-periodicity of type III bursts. One is the quasi-periodic process in magnetic reconnection at the same site, and the other is spatially unresolved stochastic processes in solar flares.

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