Abstract
On 21 September 2012, we carried out spectral observations of a solar facula in the Si i 10827 Å, He i 10830 Å, and H\(\upalpha\) spectral lines. Later, in the process of analyzing the data, we found a small-scale flare in the middle of the time series. Based on the anomalous increase in the absorption of the He i 10830 Å line, we identified this flare as a negative flare.
The aim of this article is to study the influence of the negative flare on the oscillation characteristics in the facular photosphere and chromosphere.
We measured the line-of-sight (LOS) velocity and intensity of all the three lines as well as the half-width of the chromospheric lines. We also used the Helioseismic and Magnetic Imager (HMI) magnetic field data. The flare caused a modulation of all these parameters. In the location of the negative flare, the amplitude of the oscillations increased four times on average. In the adjacent magnetic field local maxima, the chromospheric LOS velocity oscillations appreciably decreased during the flare. The facular region oscillated as a whole with a 5-minute period before the flare, and this synchronicity was disrupted after the flare. The flare changed the spectral composition of the LOS magnetic field oscillations, causing an increase in the low-frequency oscillation power.
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Acknowledgements
The research was partially supported by the Projects No. 16.3.2 and 16.3.3 of ISTP SB RAS. Spectral data on the chromosphere were recorded at the Angara Multiaccess Center facilities at ISTP SB RAS. We acknowledge the NASA/SDO science team for providing the magnetic field data. We are grateful to the anonymous referee for the useful suggestions.
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Chelpanov, A.A., Kobanov, N.I. Oscillations Accompanying a He i 10830 Å Negative Flare in a Solar Facula. Sol Phys 293, 157 (2018). https://doi.org/10.1007/s11207-018-1378-2
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DOI: https://doi.org/10.1007/s11207-018-1378-2