Decameter Type II radio burst with three harmonics

Details Decameter Type II radio burst with three harmonics Decameter Type II radio burst with three harmonics

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..688d&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

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Scientific paper

The unique decameter type II burst consisting of three harmonics is described. This burst was observed on June 4, 2004 at the world largest decameter radio telescope UTR-2 equipped with back-end with high temporal resolution in frequency band 10- 30MHz. As was found by (Melnik et al., SoPh, v.222, 151-166, 2004) type II bursts at the decameter waveband used to have fine time structure in the form of fast drifting short sub-bursts. All three harmonics of the observed Type II burst appeared to have this fine structure also. These sub-bursts had different durations for different harmonics (in average 7s for fundamental, 3s for second and 1-2s for third harmonic). The lifetime of each harmonic was 8-12 min.Wide frequency band of the analysis allowed to observe all three harmonics at one moment of time (7h53m50s UT). At this time, the drift rates of the harmonics were: -10kHz/s for fundamental (f=10MHz), -30kHz/s for second harmonic (f=20MHz) and -50kHz/s for third harmonic (f=30MHz). The second harmonic was the most intensive (maximal flux about 1000 s.f.u.) Discussed here Type II burst followed a very intense (flux of an order 10000 s.f.u.) complex event consisted of series of Type-III bursts with rich fine structure. At this time two successive CMEs were observed by SOHO-LASCO - one was respectively slow (≈300km/s) and narrow (angular size ≈13°) and another was much faster (≈1200km/s) and wider (>273°). The connection between the observed Type-II burst and CMEs is analyzed. The extensions of this Type II burst at higher frequencies (NDA data at frequencies 20-70MHz) and lower frequencies (WIND data at frequencies 1-11MHz) were also found.

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