@article{9145022ae4ba4835b01ebc1b09b75a07,
title = "Three-minute Sunspot Oscillations Driven by Magnetic Reconnection in a Light Bridge",
abstract = "We report a different type of three-minute chromospheric oscillation above a sunspot in association with a small-scale impulsive event in a light bridge (LB). During our observations, we found a transient brightening in the LB. The brightening was composed of elementary bursts that may be a manifestation of fast repetitive magnetic reconnections in the LB. Interestingly, the oscillations in the nearby sunspot umbra were impulsively excited when the intensity of the brightening reached its peak. The initial period of the oscillations was about 2.3 minutes and then gradually increased to 3.0 minutes with time. In addition, we found that the amplitude of the excited oscillations was twice the amplitude of oscillations before the brightening. Based on our results, we propose that magnetic reconnection occurring in an LB can excite oscillations in the nearby sunspot umbra.",
keywords = "Sun: UV radiation, Sun: chromosphere, Sun: transition region, sunspots",
author = "Donguk Song and Jongchul Chae and Hannah Kwak and Ryouhei Kano and Vasyl Yurchyshyn and Moon, {Yong Jae} and Lim, {Eun Kyung} and Jeongwoo Lee",
note = "Funding Information: This work was partly supported by the National Research Foundation of Korea (NRF-2017R1A2B4004466). V.Y. acknowledges support from AFOSR FA9550-15-1-0322 and NSF AST-1614457 grants and KASI. We thank the international Space Science Institute in Bern for enabling interesting discussions. J.L. was supported by the 2017 Brainpool Program of the KOFST. Funding Information: We greatly appreciate the referee{\textquoteright}s constructive comments. This work was partly supported by the National Research Foundation of Korea (NRF-2017R1A2B4004466). V.Y. acknowledges support from AFOSR FA9550-15-1-0322 and NSF AST-1614457 grants and KASI. We thank the international Space Science Institute in Bern for enabling interesting discussions. J.L. was supported by the 2017 Brainpool Program of the KOFST. Publisher Copyright: {\textcopyright} 2017. The American Astronomical Society. All rights reserved. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",
year = "2017",
month = dec,
day = "1",
doi = "10.3847/2041-8213/aa9a36",
language = "English (US)",
volume = "850",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "2",
}