175 citations · 651 across the 23 of their papers we have counts for
24 papers
What Does 2D Coronal Seismology Measure?
Zihao Yang, Yuhong Fan, Giuliana de Toma +2
Two-dimensional (2D) coronal seismology based on coronagraphic imaging spectroscopy has emerged as a promising method for mapping the coronal magnetic field, but the physical meani…
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XII. Reverberation Mapping Results for 15 PG Quasars from a Long-Duration High-Cadence Campaign
Chen Hu, Sha-Sha Li, Sen Yang +15
We present the first results from long-term high-cadence spectroscopic monitoring of 15 PG quasars with relatively strong Fe II emission as a part of a broader reverberation mappin…
Measurements of the solar coronal magnetic field based on coronal seismology with propagating Alfvenic waves: forward modeling
Yuhang Gao, Hui Tian, Tom Van Doorsselaere +3
Recent observations have demonstrated the capability of mapping the solar coronal magnetic field using the technique of coronal seismology based on the ubiquitous propagating Alfve…
Observing the evolution of the Sun's global coronal magnetic field over eight months
Zihao Yang, Hui Tian, Steven Tomczyk +4
The magnetic field in the Sun's corona stores energy that can be released to heat the coronal plasma and drive solar eruptions. Measurements of the global coronal magnetic field ha…
Is it possible to detect coronal mass ejections on solar-type stars through extreme-ultraviolet spectral observations?
Zihao Yang, Hui Tian, Yingjie Zhu +3
Stellar coronal mass ejections (CMEs) from host stars are an important factor that affects the habitability of exoplanets. Although their solar counterparts have been well observed…
The Solar Upper Transition Region Imager (SUTRI) onboard the SATech-01 satellite
Xianyong Bai, Hui Tian, Yuanyong Deng +56
The Solar Upper Transition Region Imager (SUTRI) onboard the Space Advanced Technology demonstration satellite (SATech-01), which was launched to a sun-synchronous orbit at a heigh…
Insight-HXMT and GECAM-C observations of the brightest-of-all-time GRB 221009A
Zheng-Hua An, S. Antier, Xing-Zi Bi +174
GRB 221009A is the brightest gamma-ray burst ever detected since the discovery of this kind of energetic explosions. However, an accurate measurement of the prompt emission propert…
Solar coronal magnetic field measurements using spectral lines available in Hinode/EIS observations: Strong and weak field techniques and temperature diagnostics
Yajie Chen, Xianyong Bai, Hui Tian +4
Recently, it has been proposed that the magnetic-field-induced transition (MIT) in Fe X can be used to measure coronal magnetic field strengths. Several techniques, the direct line…
On the Nature of the Three-part Structure of Solar Coronal Mass Ejections
Hongqiang Song, Jie Zhang, Leping Li +4
Coronal mass ejections (CMEs) result from eruptions of magnetic flux ropes (MFRs) and can possess a three-part structure in white-light coronagraphs, including a bright front, dark…
Forward Modeling of Magnetic-field Measurements at the Bases of Stellar Coronae through Extreme-Ultraviolet Spectroscopy
Xianyu Liu, Hui Tian, Yajie Chen +4
Measurements of the stellar coronal magnetic field are of great importance in understanding the stellar magnetic activity, yet the measurements have been extremely difficult. Recen…
An Insight-HXMT view of the mHz quasi-regular modulation phenomenon in the black hole X-ray binary 4U 1630-47
Zi-Xu Yang, Liang Zhang, Yue Huang +97
Here we report the spectral-timing results of the black hole X-ray binary 4U 1630-47 during its 2021 outburst using observations from the Hard X-ray Modulation Telescope. Type-C qu…
The accretion flow geometry of MAXI J1820+070 through broadband noise research with Insight-HXMT
Zi-Xu Yang, Liang Zhang, Qing-Cui Bu +24
Here we present a detailed study of the broadband noise in the power density spectra of the black hole X-ray binary MAXI J1820+070 during the hard state of its 2018 outburst, using…
Can we detect coronal mass ejections through asymmetries of Sun-as-a-star extreme-ultraviolet spectral line profiles?
Zihao Yang, Hui Tian, Xianyong Bai +8
Coronal mass ejections (CMEs) are the largest-scale eruptive phenomena in the solar system. Associated with enormous plasma ejections and energy release, CMEs have an important imp…
Measurements of the magnetic field strengths at the bases of stellar coronae using the magnetic-field-induced transition theory
Yajie Chen, Xianyu Liu, Hui Tian +6
Measurements of the magnetic field in the stellar coronae are extremely difficult. Recently, it was proposed that the magnetic-field-induced transition (MIT) of the Fe X 257 Å line…
Forward Modeling of Solar Coronal Magnetic Field Measurements Based on a Magnetic-field-induced Transition in Fe X
Yajie Chen, Wenxian Li, Hui Tian +6
It was recently proposed that the intensity ratios of several extreme ultraviolet spectral lines from the Fe X ion can be used to measure the solar coronal magnetic field based on…
Reverberation Mapping of Two Luminous Quasars: the Broad-line Region Structure and Black Hole Mass
Sha-Sha Li, Sen Yang, Zi-Xu Yang +21
We report the results of a multi-year spectroscopic and photometric monitoring campaign of two luminous quasars, PG~0923+201 and PG~1001+291, both located at the high-luminosity en…
Velocity-resolved Reverberation Mapping of Changing-look AGN NGC 2617
Hai-Cheng. Feng, H. T. Liu, J. M. Bai +6
NGC 2617 has attracted a lot of attention after the detection of the changes in spectral type, and its geometry and kinematics of broad-line region (BLR) are still ambiguous. In th…
Reverberation Mapping of Changing-look Active Galactic Nucleus NGC 3516
Hai-Cheng. Feng, Chen. Hu, Sha-Sha. Li +7
The changes of broad emission lines should be a crucial issue to understanding the physical properties of changing-look active galactic nucleus (CL-AGN). Here, we present the resul…
Evidence for Two Distinct Broad-Line Regions from Reverberation Mapping of PG 0026+129
Chen Hu, Sha-Sha Li, Wei-Jian Guo +17
We report on the results of a new spectroscopic monitoring campaign of the quasar PG 0026+129 at the Calar Alto Observatory 2.2m telescope from July 2017 to February 2020. Signific…
Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-Dependent Spectral Behavior
Hai-Cheng Feng, Sen. Yang, Zi-Xu. Yang +17
In this paper, we report the new results of spectroscopic observations of -ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4 m optical telescope at Lijiang O…
Mapping the magnetic field in the solar corona through magnetoseismology
Zihao Yang, Hui Tian, Steven Tomczyk +4
Magnetoseismology, a technique of magnetic field diagnostics based on observations of magnetohydrodynamic (MHD) waves, has been widely used to estimate the field strengths of oscil…
Global maps of the magnetic field in the solar corona
Zihao Yang, Christian Bethge, Hui Tian +10
Understanding many physical processes in the solar atmosphere requires determination of the magnetic field in each atmospheric layer. However, direct measurements of the magnetic f…
Diagnosing the magnetic field structure of a coronal cavity observed during the 2017 total solar eclipse
Yajie Chen, Hui Tian, Yingna Su +11
We present an investigation of a coronal cavity observed above the western limb in the coronal red line Fe X 6374 Å using a telescope of Peking University and in the green line Fe…
Two Solar Tornadoes Observed with the Interface Region Imaging Spectrograph
Zihao Yang, Hui Tian, Hardi Peter +4
The barbs or legs of some prominences show an apparent motion of rotation, which are often termed solar tornadoes. It is under debate whether the apparent motion is a real rotating…