Decameter Type III-like Bursts

Details Decameter Type III-like Bursts Decameter Type III-like Bursts

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..27m&link_type=abstract

Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #27

Astronomy and Astrophysics

Astrophysics

Scientific paper

We discuss the Type III-like bursts observed at frequencies 10-30MHz at UTR-2 (Kharkov, Ukraine) for the first time. These bursts have frequency drift rates 2-6 times of drift rates of usual decameter Type III bursts. The statistical analysis of more than some hundreds of bursts shows that the majority of them have durations 1-2s and radio fluxes 10-50 s.f.u. Decameter Type III-like bursts happen most frequently in the days when active region is near the central meridian. It says about important role of propagation effects in the Type III-like burst phenomenon.
We also observed a Type III-like burst with reduction. It was registered in absorption at >24MHz and in emission at lower frequencies. Its duration was unchanged (2s), but frequency drift rates were different - 6MHz/s in absorption and 10MHz/s in emission. Radio emission flux of the burst changes from 10s.f.u. to 100s.f.u. at frequency 24MHz.
The physical causes of Type III-like bursts phenomenon in decameter range are discussed.

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