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Article Dans Une Revue Solar Physics Année : 2010

Solar S-bursts at Frequencies of 10 - 30 MHz

Résumé

Solar S-bursts observed by the radio telescope UTR-2 in the period 2001 - 2002 are studied. The bursts chosen for a detailed analysis occurred in the periods 23 - 26 May 2001, 13 - 16 and 27 - 39 July 2002 during three solar radio storms. More than 800 S-bursts were registered in these days. Properties of S-bursts are studied in the frequency band 10 - 30 MHz. All bursts were always observed against a background of other solar radio activity such as type III and IIIb bursts, type III-like bursts, drift pairs and spikes. Moreover, S-bursts were observed during days when the active region was situated near the central meridian. Characteristic durations of S-bursts were about 0.35 and 0.4 - 0.6 s for the May and July storms, respectively. For the first time, we found that the instantaneous frequency width of S-bursts increased with frequency linearly. The dependence of drift rates on frequency followed the McConnell dependence derived for higher frequencies. We propose a model of S-bursts based on the assumption that these bursts are generated due to the confluence of Langmuir waves with fast magnetosonic waves, whose phase and group velocities are equal.
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Dates et versions

hal-03732652 , version 1 (21-07-2022)

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Citer

Valentin N. Melnik, Alexander A. Konovalenko, Helmut O. Rucker, V. V. Dorovskyy, E. P. Abranin, et al.. Solar S-bursts at Frequencies of 10 - 30 MHz. Solar Physics, 2010, 264, pp.103-117. ⟨10.1007/s11207-010-9571-y⟩. ⟨hal-03732652⟩
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