Abstract
To obtain constraints for models of fiber bursts, high-resolution time (0.01 s) profiles of the fiber bursts recorded at 1420 and 2695 MHz by the Trieste radiometers are studied in detail. The fiber bursts were identified using Ondřejov radio spectra. During the years 2000 – 2005, 18 intervals with fiber bursts were selected; 26 groups were defined and about 700 fibers were analyzed in detail. More than 300 pulsations, present almost simultaneously with the fibers, were also selected and studied in order to find similarities or differences between these two types of fine structures. It was found that the polarization of the associated continuum, both for fiber bursts and pulsations, is practically the same. Evaluating the ratio between absorption over emission of many single fibers we found that this parameter is very different even for nearby bursts; however, we realized that this ratio shows a tendency to decrease with time. Finally, the time profile of one selected fiber burst was fitted using a recent model based on the modulation of the broadband radio emission by fast magnetoacoustic waves. The results are discussed.
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Acknowledgements
The authors thank the referee (Dr. G.P. Chernov) for comments that improved the paper. This research was supported by the grant P209/12/0103 (GA CR), the project RVO:67985815 of the Astronomical Institute of the Academy of Sciences of the Czech Republic, and the Marie Curie PIRSES-GA-2011-295272 RadioSun project. The authors acknowledge Mr. S. Padovan and Mr. I. Coretti (INAF – Trieste Astronomical Observatory) for their care in instrument maintenance and radio data recording. The program for radio data calibration and reduction was prepared by Mr. S. Padovan.
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Zlobec, P., Karlický, M. High-Resolution Time Profiles of Fiber Bursts at 1420 and 2695 MHz. Sol Phys 289, 1683–1699 (2014). https://doi.org/10.1007/s11207-013-0429-y
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DOI: https://doi.org/10.1007/s11207-013-0429-y