Investigation of the nature and parameters of wave processes in the flare region of the solar atmosphere
Abstract
The paper presents the results of simultaneous observations of fluctuations of the integral radio emission flux in the solar flare region generated in the transition layer (λ = 10.7 cm) and the lower corona (λ = 27.8 cm). The observations were carried out with the RT-12 radio telescope of the Institute of the Ionosphere of the Republic of Kazakhstan on June 7, 2011, October 25, 2013, and February 20, 2014. By measuring the time profiles between quasi-periodic radio emission intensity fluctuations, it was found that for periods of 20–350 seconds, propagation of perturbations from the chromosphere to the corona is always observed with a time delay of 20–100 seconds. Using a number of models for the active Sun, estimates were made of the propagation velocities of disturbances of 200–2500 km/s and the ranges of the detected periods. It is shown that they correspond to the speed of Alfven and fast magnetoacoustic waves. Thus, we conclude that in our study, the quasi-periodicity in the flare region of the Sun is associated with MHD oscillations.
- Publication:
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INASAN Science Reports
- Pub Date:
- October 2023
- DOI:
- 10.51194/INASAN.2023.8.2.010
- Bibcode:
- 2023INASR...8...97H
- Keywords:
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- Solar flares;
- solar activity;
- radio bursts;
- microwave radiation;
- quasi-periodic pulsations