Physics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011soph..273..393m&link_type=abstract
Solar Physics, Volume 273, Issue 2, pp.393-402
Physics
Sun: Corona, Sun: Flares, Sun: Radio Radiation, Sun: Oscillations, Methods: Data Analysis
Scientific paper
A dm-radio emission with fiber bursts observed on 11 July 2005 was analyzed using wavelet filtration and spectral methods. In filtered radio spectra we found structures with different characteristic period P and frequency drift FD: i) fiber substructures (composed of dot emissions) with P 1≈ 0.5 s, FD1=- 87 MHz s-1 on average, ii) fiber structures with P 2≈1.9 s, and iii) drifting structures with P 3≈81.4 s, FD2=- 8.7, + 98.5, and - 21.8 MHz s-1. In the wavelet spectra we recognized patterns having the form of tadpoles. They were detected with the same characteristic periods P as found for the filtered structures. The frequency drift of the tadpole heads is found to be equal to the frequency drift of some groups of fibers for the long-period wavelet tadpoles ( P 3) and to the frequency drift of individual fibers for the short-period tadpoles ( P 2). Considering these wavelet tadpoles as signatures of propagating magnetoacoustic wave trains, the results indicate the presence of several wave trains in the fibers' source. While the long-period wave trains trigger or modulate a whole group of fibers, the short-period ones look like being connected with individual fiber bursts. This result supports the model of fibers based on magnetoacoustic waves. Using a density model of the solar atmosphere we derived the velocities of the magnetoacoustic waves, 107 and 562 km s-1, and setting them equal to the Alfvén ones we estimated the magnetic field in the source of fiber bursts as 10.7 and 47.8 G.
Karlicky Marian
Mészárosová Hana
Rybák Ján
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