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Sunquakes of Solar Cycle 24 View all abstracts by submitter

Ivan Sharykin   Submitted: 2020-04-20 23:36

The paper presents results of a search for helioseismic events (sunquakes) produced by M-X class solar flares during Solar Cycle 24. The search is performed by analyzing photospheric Dopplergrams from Helioseismic Magnetic Imager (HMI). Among the total number of 500 M-X class flares, 82 helioseismic events were detected. This result is quite unexpected, since it was previously thought that sunquakes were very rare and observed mainly in strong flares. However, our analysis has shown that there many strong sunquakes were produced by solar flares of low M class, while in some powerful X-class flares helioseismic waves were not observed or were weak. Our analysis also revealed several active regions characterized by the most efficient generation of helioseismic waves during flares. We found that the sunquake power correlates with the maximum value of soft X-ray flux time derivative better than with the X-ray class, indicating that the sunquake mechanism is associated with high-energy particles. We also show that the seismically active flares are more impulsive than the flares without photospheric and helioseismic perturbations. We present a new catalog of helioseismic solar flares, which opens opportunities for performing statistical studies to better understand physics of sunquakes as well as flare energy release and transport.

Authors: I.N. Sharykin, A.G. Kosovichev
Projects: None

Publication Status: Accepted for publication
Last Modified: 2020-04-22 09:36
Go to main E-Print page  Plasma Diagnostics from Active Region and Quiet-Sun Spectra Observed by Hinode/EIS: Quantifying the Departures from a Maxwellian Distribution  Flare Energy Release at the Magnetic Field Polarity Inversion Line During M1.2 Solar Flare of 2015 March 15. II. Investigation of Photospheric Electric Current and Magnetic Field Variations Using HMI 135-second Vector Magnetograms  Edit Entry  Download Preprint  Delete Entry 

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