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Velocities and Temperatures of an Ellerman Bomb and Its Associated Features

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Abstract

We investigated the velocity and temperature characteristics of an Ellerman bomb (EB) and its associated features based on observations made with the Fast Imaging Solar Spectrograph (FISS) and a broadband TiO filter of the 1.6 meter New Solar Telescope at Big Bear Solar Observatory. In the TiO images of the photospheric level, we found a granular cell expanding in two opposite directions near the site of the EB. When one end of this granule reached the EB site, the transverse speed of the tip of the expanding granule rapidly decreased and the EB brightened. The wings of the Hα profile of the EB indicated that the EB was blueshifted up to 7 km s−1. About 260 s after the EB brightening, a surge was seen in absorption and varied from a blueshift of 20 km s−1 to a redshift of 40 km s−1 seen in the Hα and Ca ii 8542 Å lines. From the Doppler absorption width of the two lines determined by applying the cloud model, we estimated the mean temperature of the surge material to be about 29000 K and the mean speed of nonthermal motion to be about 11 km s−1. We discuss the physical implications of our results in terms of magnetic reconnection and processes related to it.

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Acknowledgements

We greatly appreciate the referee’s constructive comments. We are grateful to the BBSO team for their technical support for the observations. This work was supported by the National Research Foundation of Korea (2011-0028102). E.-K. Lim is supported by the “Study of near-Earth effects by CME/HSS” project and basic research funding from KASI. Yeon-Han Kim and Eun-Kyung Lim were supported by the Construction of Korean Space Weather Center, the project of KASI, and the KASI basic research fund.

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Authors and Affiliations

  1. Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul, 151-747, Korea

    Heesu Yang, Jongchul Chae, Hyungmin Park, Kyuhyoun Cho, Ram Ajor Maurya & Donguk Song

  2. Korea Astronomy & Space Science Institute, Daejeon, 305-348, Korea

    Eun-Kyung Lim & Yeon-Han Kim

  3. Big Bear Solar Observatory, Big Bear City, CA, 92314-9672, USA

    Philip R. Goode

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  1. Heesu Yang
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  2. Jongchul Chae
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  3. Eun-Kyung Lim
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Correspondence to Heesu Yang.

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Initial Results from FISS

Guest Editor: Jongchul Chae

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Yang, H., Chae, J., Lim, EK. et al. Velocities and Temperatures of an Ellerman Bomb and Its Associated Features. Sol Phys 288, 39–53 (2013). https://doi.org/10.1007/s11207-013-0354-0

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