Three-minute Sunspot Oscillations Driven by Magnetic Reconnection in a Light Bridge

Donguk Song; Jongchul Chae; Hannah Kwak; Ryouhei Kano; Vasyl Yurchyshyn; Yong Jae Moon; Eun Kyung Lim; Jeongwoo Lee

doi:10.3847/2041-8213/aa9a36

Three-minute Sunspot Oscillations Driven by Magnetic Reconnection in a Light Bridge

Donguk Song, Jongchul Chae, Hannah Kwak, Ryouhei Kano, Vasyl Yurchyshyn, Yong Jae Moon, Eun Kyung Lim, Jeongwoo Lee

Center For Solar Terrestrial Research - Big Bear Solar Observatory

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

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.

Original language	English (US)
Article number	L33
Journal	Astrophysical Journal Letters
Volume	850
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/aa9a36
State	Published - Dec 1 2017

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Sun: UV radiation
Sun: chromosphere
Sun: transition region
sunspots

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10.3847/2041-8213/aa9a36

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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.",

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doi = "10.3847/2041-8213/aa9a36",

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T1 - Three-minute Sunspot Oscillations Driven by Magnetic Reconnection in a Light Bridge

AU - Song, Donguk

AU - Chae, Jongchul

AU - Kwak, Hannah

AU - Kano, Ryouhei

AU - Yurchyshyn, Vasyl

AU - Moon, Yong Jae

AU - Lim, Eun Kyung

AU - Lee, Jeongwoo

N1 - 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’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: © 2017. The American Astronomical Society. All rights reserved.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - 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.

AB - 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.

KW - Sun: UV radiation

KW - Sun: chromosphere

KW - Sun: transition region

KW - sunspots

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ER -

Three-minute Sunspot Oscillations Driven by Magnetic Reconnection in a Light Bridge

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