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Two Quasi-periodic Oscillations in ESO 113-G010
Zhang, Peng; Yan, Jing-Zhi; Liu, Qing-Zhong
In the narrow-line Seyfert galaxy (NLS1) ESO 113-G010, two quasi-periodic oscillation (QPO) signals are detected in the XMM-Newton data collected in 2005 November. The XMM-Newton telescope has an exposure longer than 100 ks in the energy range of 0.3-10 keV. The data are analyzed using the Lomb-Scargle periodogram (LSP) and the weighted wavelet Z-…
Automatic Coronagraph Image Classification with Machine Learning Methods
Zhang, Yan; Feng, Li; Li, Hui +5 more
The detection of Coronal Mass Ejections (CMEs) is an important prerequisite for establishing a CME event database and realizing the prediction of CME interplanetary propagation. The Lyman-alpha Solar Telescope (LST) aboard the ASO-S (Advanced Space-based Solar Observatory) satellite will be equipped with a white-light coronagraph. The images with …
Study of the Streamer Current Sheet with White-Light and UV Observations
Feng, Li; Li, Hui; Shi, Guang-lu +2 more
Current sheets (CSs) are the main region where magnetic reconnections can convert magnetic energy into plasma thermal and kinetic energies. We have studied a CS in the streamer occurred on 3 January 2003 by combining the White-Light (WL) images observed by the Large Angle and Spectrometric Coronagraph (LASCO) and the EUV spectra detected by the Ul…
The Galactic Aberration and Its Impact on Astronomical Reference Frames
Liu, Jia-cheng; Liu, Niu
The Galactic aberration effect, also known as the secular aberration drift, is a consequence of the centripetal acceleration of the Solar System Barycenter in the circular orbit around the Galactic center. It causes distance-independent apparent proper motions (the amplitude is about 5 µas · yr - 1) for extragalactic sources which…