Parameters of Coronal Dimmings and Their Variations during Solar Cycle 24

The parameters of dimmings and their relation to coronal mass ejections (CMEs) are studied to determine the location of possible sources of ejections on the solar disk during solar cycle 24. We used the Solar Demon database, which contains information on flares and dimmings obtained by processing im...

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Bibliographic Details
Published in:Geomagnetism and Aeronomy 2024-02, Vol.64 (1), p.1-10
Main Authors: Vakhrusheva, A. A., Shugai, Yu. S., Kaportseva, K. B., Eremeev, V. E., Kalegaev, V. V.
Format: Article
Language:English
Subjects:
Coronagraphs
Coronal mass ejection
Correlation coefficient
Correlation coefficients
Dimming
Earth and Environmental Science
Earth orbits
Earth Sciences
Geophysics/Geodesy
Parameters
Solar corona
Solar cycle
Solar physics
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Summary:The parameters of dimmings and their relation to coronal mass ejections (CMEs) are studied to determine the location of possible sources of ejections on the solar disk during solar cycle 24. We used the Solar Demon database, which contains information on flares and dimmings obtained by processing images from the SDO/AIA space observatory. Of all the analyzed dimmings, 16% are аssociated with CMEs from the CACTus database using SOHO/LASCO coronagraph data for 2010–2018. Based on the parameter distribution, it is found that dimmings related with CMEs are on average events with large absolute parameter values. The correlation coefficient between the position angle of the dimmings and the position angle of the CME associated with them is 0.96. For dimmings observed in the central part of the solar disk, we obtained correlation coefficients between the CME velocity and dimming parameters that are close to 0.5. The results can be used to model the propagation of CMEs and to refine the probability of their arrival to the near-Earth orbit.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793223600868