Search Publications
Long-term Variation of the Solar Polar Magnetic Fields at Different Latitudes
Hou, Yijun; Li, Ting; Yang, Shuhong +10 more
The polar magnetic fields of the Sun play an important role in governing solar activity and powering fast solar wind. However, because our view of the Sun is limited in the ecliptic plane, the polar regions remain largely uncharted. Using the high spatial resolution and polarimetric precision vector magnetograms observed by Hinode from 2012 to 202…
Resolution Enhancement of SOHO/MDI Magnetograms
Qin, Ying; Yu, Xiao-Guang; Ji, Kai-Fan +1 more
Research on the solar magnetic field and its effects on solar dynamo mechanisms and space weather events has benefited from the continual improvements in instrument resolution and measurement frequency. The augmentation and assimilation of historical observational data timelines also play a significant role in understanding the patterns of solar m…
Global Energetics of Solar Powerful Events on 2017 September 6
Lu, Lei; Dresing, Nina; Wang, Jincheng +9 more
Solar flares and coronal mass ejections (CMEs) are thought to be the most powerful events on the Sun. They can release energy as high as ~1032 erg in tens of minutes, and also can release solar energetic particles (SEPs) into interplanetary space. We explore global energy budgets of solar major eruptions that occurred on 2017 September …
A Comparison of Co-temporal Vector Magnetograms Obtained with HMI/SDO and SP/Hinode
Zhang, Mei; Zhang, Haocheng; Jiang, Chengqing
Accurate measurement of magnetic fields is very important for understanding the formation and evolution of solar magnetic fields. Currently, there are two types of solar magnetic field measurement instruments: filter-based magnetographs and Stokes polarimeters. The former gives high temporal resolution magnetograms and the latter provides more acc…
Magneto-acoustic oscillations observed in a solar plage region
Cao, Wenda; Xu, Zhe; Ji, Kaifan +4 more
We gave an extensive study for the quasi-periodic perturbations on the time profiles of the line of sight (LOS) magnetic field in 10 × 10 sub-areas in a solar plage region (corresponds to a facula on the photosphere). The perturbations are found to be associated with the enhancement of He I 10830 Å absorption in a moss region, which is connected t…
Observation of solar coronal heating powered by magneto-acoustic oscillations in a moss region
Ji, Kai-Fan; Hashim, Parida; Hong, Zhen-Xiang +3 more
In this paper, we report the observed temporal correlation between extreme-ultraviolet (EUV) emission and magneto-acoustic oscillations in an EUV moss region, which is the footpoint region only connected by magnetic loops with million-degree plasma. The result is obtained from a detailed multi-wavelength data analysis of the region with the purpos…
Predicting the CME arrival time based on the recommendation algorithm
Luo, Bingxian; Liu, Zhu; Li, Ming +9 more
CME is one of the important events in the sun-earth system as it can induce geomagnetic disturbance and an associated space environment effect. It is of special significance to predict whether CME will reach the Earth and when it will arrive. In this paper, we firstly built a new multiple association list for 215 different events with 18 character…
Magnetic flux participation in solar surface magnetism during solar cycle 24
Wang, Jing-Xiu; Jin, Chun-Lan
This study aims at investigating surface magnetic flux participation among different types of magnetic features during solar cycle 24. State-of-the-art observations from SDO/HMI and Hinode/SOT are combined to form a unique database in the interval from April 2010 to October 2015. Unlike previous studies, the statistics presented in this paper are …
Manifestations of bright points observed in G-band and Ca II H by Hinode/SOT
Lin, Jun; Wu, Ning; Liu, Yan-Xiao
An algorithm was developed for identifying and tracking a magnetic bright point, or bright point (BP) for short, observed in both the photosphere (G-band) and chromosphere (Ca II H), as well as for pairing a photospheric BP (PBP) with its conjugate chromospheric BP (CBP). Two sets of data observed by Hinode/SOT in the quiet Sun near the disk cente…
Superpenumbral chromospheric flare
Srivastava, Abhishek K.; Liu, Suo; Zhang, Hong-Qi +2 more
We observed a C-class flare at the outer boundary of the superpenumbra of a sunspot. The flare was triggered by an emerging magnetic bipolar region that was obliquely oriented with respect to the superpenumbral fibrils. The flare started due to the low height magnetic reconnection of emerging magnetic flux with a superpenumbral field resulting in …