Zobrazeno 1 - 10
of 80
pro vyhledávání: '"SONG, Donguk"'
Autor:
Li, Hao, Alemán, Tanausú del Pino, Bueno, Javier Trujillo, Ishikawa, Ryohko, Ballester, Ernest Alsina, McKenzie, David E., Belluzzi, Luca, Song, Donguk, Okamoto, Takenori J., Kobayashi, Ken, Rachmeler, Laurel A., Bethge, Christian, Auchère, Frédéric
We apply the HanleRT Tenerife Inversion Code to the spectro-polarimetric observations obtained by the Chromospheric LAyer SpectroPolarimeter. This suborbital space experiment measured the variation with wavelength of the four Stokes parameters in the
Externí odkaz:
http://arxiv.org/abs/2408.06094
Autor:
Ishikawa, Ryohko, Bueno, Javier Trujillo, Ballester, Ernest Alsina, Belluzzi, Luca, Alemán, Tanausú del Pino, McKenzie, David E., Auchère, Frédéric, Kobayashi, Ken, Okamoto, Takenori J., Rachmeler, Laurel A., Song, Donguk
Radiative transfer investigations of the solar Mg II h and k resonance lines around 280~nm showed that, while their circular polarization (Stokes V) signals arise from the Zeeman effect, the linear polarization profiles (Stokes Q and U) are dominated
Externí odkaz:
http://arxiv.org/abs/2302.03303
Autor:
Li, Hao, Alemán, T. del Pino, Bueno, J. Trujillo, Ishikawa, R., Ballester, E. Alsina, McKenzie, David E., Auchère, Frédéric, Kobayashi, Ken, Okamoto, Takenori J., Rachmeler, Laurel A., Song, Donguk
We apply the Tenerife Inversion Code (TIC) to the plage spectropolarimetric observations obtained by the Chromospheric LAyer SpectroPolarimeter (CLASP2). These unprecedented data consist of full Stokes profiles in the spectral region around the Mg II
Externí odkaz:
http://arxiv.org/abs/2301.12792
Autor:
Ishikawa, Ryohko, Bueno, Javier Trujillo, Aleman, Tanausu del Pino, Okamoto, Takenori J., McKenzie, David E., Auchere, Frederic, Kano, Ryouhei, Song, Donguk, Yoshida, Masaki, Rachmeler, Laurel A., Kobayashi, Ken, Hara, Hirohisa, Kubo, Masahito, Narukage, Noriyuki, Sakao, Taro, Shimizu, Toshifumi, Suematsu, Yoshinori, Bethge, Christian, De Pontieu, Bart, Dalda, Alberto Sainz, Vigil, Genevieve D., Winebarger, Amy, Ballester, Ernest Alsina, Belluzzi, Luca, Stepan, Jiri, Ramos, Andres Asensio, Carlsson, Mats, Leenaarts, Jorrit
Publikováno v:
Science Advances, Vol. 7, no. 8, eabe8406, 2021
Routine ultraviolet imaging of the Sun's upper atmosphere shows the spectacular manifestation of solar activity; yet we remain blind to its main driver, the magnetic field. Here we report unprecedented spectropolarimetric observations of an active re
Externí odkaz:
http://arxiv.org/abs/2103.01583
Autor:
Lim, Eun-Kyung, Yang, Heesu, Yurchyshyn, Vasyl, Chae, Jongchul, Song, Donguk, Madjarska, Maria S.
Light bridges (LBs) are relatively bright structures that divide sunspot umbrae into two or more parts. Chromospheric LBs are known to be associated with various activities including fan-shaped jet-like ejections and brightenings. Although magnetic r
Externí odkaz:
http://arxiv.org/abs/2010.10713
Publikováno v:
A&A 642, A154 (2020)
It is not yet fully understood how magnetohydrodynamic waves in the interior and atmosphere of the Sun are excited. Traditionally, turbulent convection in the interior is considered to be the source of wave excitation in the quiet Sun. Over the last
Externí odkaz:
http://arxiv.org/abs/2008.12779
Autor:
Cho, Il-Hyun, Moon, Yong-Jae, Nakariakov, Valery M., Bong, Su-Chan, Lee, Jin-Yi, Song, Donguk, Lee, Harim, Cho, Kyung-Suk
Measurement of the solar wind speed near the Sun is important for understanding the acceleration mechanism of the solar wind. In this study, we determine 2D solar wind speeds from 6 to 26 solar radii by applying Fourier motion filters to \textit{SOHO
Externí odkaz:
http://arxiv.org/abs/1806.08540
Autor:
Song, Donguk, Chae, Jongchul, Kwak, Hannah, Kano, Ryouhei, Yurchyshyn, Vasyl, Moon, Yong-Jae, Lim, Eun-Kyung, Lee, Jeongwoo
We report a different type of three-minute chromospheric oscillations above a sunspot in association with a small-scale impulsive event in a light bridge. During our observations, we found a transient brightening in the light bridge. The brightening
Externí odkaz:
http://arxiv.org/abs/1711.06489
Autor:
Song, Donguk, Chae, Jongchul, Yurchyshyn, Vasyl, Lim, Eun-Kyung, Cho, Kyung-Suk, Yang, Heesu, Cho, Kyuhyoun, Kwak, Hannah
It is well-known that light bridges inside a sunspot produce small-scale plasma ejections and transient brightenings in the chromosphere, but the nature and origin of such phenomena are still unclear. Utilizing the high-spatial and high temporal reso
Externí odkaz:
http://arxiv.org/abs/1701.06808
Autor:
Kwak, Hannah, Chae, Jongchul, Song, Donguk, Kim, Yeon-Han, Lim, Eun-Kyung, Madjarska, Maria S.
We report three-minute oscillations in the solar chromosphere driven by a strong downflow event in a sunspot. We used the Fast Imaging Solar Spectrograph of the 1.6 m New Solar Telescope and the Interface Region Imaging Spectrograph (IRIS). The stron
Externí odkaz:
http://arxiv.org/abs/1604.02252