Abstract
We performed a multi-wave study of the oscillation dynamics in short-lived facular regions during their lifetime. We studied oscillations in five regions, three of which belonged to the beginning of the current solar-activity cycle and two of them existed at the end of the previous cycle. We found that in the facular regions of the current cycle, low-frequency (1 – 2 mHz) oscillations dominated in the early stages of the facular formation, while in the regions of the previous cycle, five-minute oscillations dominated at this stage. At the maximal development phase of all the facular regions, the locations of the observed low frequencies are closely related to those of the coronal loops. These results support the idea that the sources of the low-frequency oscillations in the loops lie at the loops’ foot points.
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Data Availability
The spectral ground-based data used in this work are available from the corresponding author upon request. The SDO data are available to download through the Joint Science Operations Center (JSOC) Data Explore service (jsoc.stanford.edu/ajax/lookdata.html).
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Acknowledgments
Spectral data were recorded at the Angara Multiaccess Center facilities at ISTP SB RAS. We acknowledge use of data courtesy of NASA/SDO and the AIA and HMI science teams. We gratefully acknowledge the use of data from the Goode Solar Telescope (GST) of the Big Bear Solar Observatory (BBSO). BBSO operation is supported by NJIT and US NSF AGS-1821294 grant. GST operation is partly supported by the Korea Astronomy and Space Science Institute and the Seoul National University. We are grateful to the anonymous reviewer for suggestions that helped improve the text.
Funding
The reported study was funded by RFBR, project number 20-32-70076 and Project No. II.16.3.2 of ISTP SB RAS.
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This article belongs to the Topical Collection:
Magnetohydrodynamic (MHD) Waves and Oscillations in the Sun’s Corona and MHD Coronal Seismology
Guest Editors: Dmitrii Kolotkov and Bo Li
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Chelpanov, A., Kobanov, N. Oscillation Dynamics in Short-Lived Facular Regions During Their Lifetime. Sol Phys 297, 52 (2022). https://doi.org/10.1007/s11207-022-01988-5
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DOI: https://doi.org/10.1007/s11207-022-01988-5