个人简介
1985年8月生，教授，博导。2012年6月获南京大学天文学博士学位，2010年9月至2011年12月在美国乔治梅森大学联合培养，2015年7月被聘为副教授，2019年2月至2022年7月为德国马普太阳系研究所“洪堡高访学者”，2020年12月被聘为教授。2017年获国家基金委优秀青年基金、江苏省杰出青年基金资助。2013年获江苏省优秀博士学位论文奖、美国地球物理学会“Sunanda and Santimay Basu Early Career Award”，2015年获第五届中国天文学会“黄授书奖”，2021年获亚太等离子体物理学会“青年科学家奖”、爱思唯尔中国高被引学者。
承担课程
《空间物理导论》Introduction of Space Physics (for junior) chap1_Introduction, chap2_plasma_picture, chap3_single_particle, chap4_Magnetohydrostatics,chap4_MHD_application, chap5_wave, chap6_solar_eruptions,chap6_solar_atmosphere, chap6_solar_instruments,chap8_magnetosphere, chap7_solarwind, chap9_Summary
《天文与天体物理中的热点研究》Hot Topics in Astronomy and Astrophysics (for junior)
第一讲2021, 第二讲2021, 第三讲2021, 第四讲2021
Project 1. Origin and Evolution of Coronal Mass Ejections
Coronal mass ejections (CMEs) and solar flares are the most energetic eruptive phenomena in our solar system and can release a large quantity of plasma and magnetic flux from the solar atmosphere into the solar wind, probably giving rise to severe space weather effects. The aim of this project is toward understanding the orgin and evolution of CMEs/flares through multi-wavelength observational perspective. The figure on the right shows a CME observed by the Large Angle and Spectrometric Coronagraph on board the Solar and Heliospheric Observatory. The zoom-in of the flaring region indicated by the white box shows an erupting hot magnetic flux rope (10 million-degree) at 131 angstrom observed by the Atmospheric Imaging Assembly telescope on board the Solar Dynamics Observatory.
Publications:
Cheng, X., Zhang, J., Liu, Y., Ding, M. D, 2011, ApJL 732, L25
Zhang, J., Cheng, X Ding, M. D., 2012 Nature Communications 3, 747 (Featured)
Cheng, X., Zhang, J., Ding, M. D., et al., 2013, ApJ 763, 43
Cheng, X., Ding, M. D., Guo, Y., et al., 2014, ApJ 780, 28
Cheng, X., Ding, M. D., 2016, ApJS 225, 16
Zhou, Z. J. Cheng, X., Liu, L. J., et al. 2019, ApJL, 877, L28
Cheng, X., Zhang, J., Kliem, B., Torok, T., et al. 2020, ApJ, 894, 85
Code for Kinematic analysis
Project 2. Structure and Evolution of Magnetic Flux Ropes
Magnetic flux rope (MFR) is a volumetic plasma structure with magnetic field lines wrapping around a central axis. It is a foundmental magnetic structure in the Universe, has been invloved in various astrophysical contexts like the magnetotail of the Earth, the Nebula and the black hole system. The aim of this project is to address the structure and evolution of the MFR, in particular the relation to the dynamics of CMEs via the combination of observation and MHD simulation. The figure on the right shows the emission feature of the pre-eruptive MFR on 2012 July 12 at the different temperatures (3-4 MK and 8-10 MK) and corresponding 3D magnetic structure.
Publications:
Cheng, X., Zhang, J., Saar, S. H., Ding, M. D., 2012, ApJ 761, 62
Cheng, X., Ding, M. D., Zhang, J., et al. 2014, ApJ 789, 93
Cheng, X., Ding, M. D., Fang, C., 2015, ApJ 804, 82
Liu, L. J., Cheng, X., Wang, Y. M., et al. 2018, ApJL, 867, L5
Liu, L. J., Cheng, X., Wang, Y. M., et al. 2019, ApJ, 884, 45
Xing, C., Cheng, X., Ding, M. D., 2020, The Innovation, 3, 100059
Code for DEM inversion
Project 3. Magnetic Reconnection and Turbulence
Magnetic reconnection, a change of magnetic field connectivity, is a fundamental physical process in the Universe. During solar eruptions, the reconnection, taking place between CMEs and flares, releases magnetic energy explosively to power the CME eruption and the flare emission. The aim of this project is to reveal 3D features of magnetic reconnection and its relation to turbulence during CMEs/flares through observation and MHD simulation. The figure on the right displays 3D magnetic field structures during the flux rope eruption, in which the reconnection converts two sheared overlying field lines to a flare loop and a twisted field line that is added to the pre-existing rising flux rope.
Publications:
Cheng, X., Zhang, J., Liu, Y., Ding, M. D, 2011, ApJL 732, L25
Sun, J. Q., Cheng, X., Ding, M. D., et al., 2015, Nature Communications 6, 7598 (Featured)
Cheng, X., Li, Y., Wan, L. F., et al., 2018, ApJ 866, 64 (Press release)
Xing, C., Cheng, X., Qiu, J., et al., 2020, ApJ 889, 129
Project 4. Coronal Shocks and Solar Radio Bursts
As CMEs erupt upward, coronal shocks may form at the front of the CMEs, generaging metric type II radio bursts, a narrow-band radio emission enhancement excited at the local plasma frequency. On the other hand, eletron beams, may be accelerated by magentic reconnection, produce type III radio bursts simultaneously. At present, the questions of how coronal shocks are formed, what properties do they have, and what conditions do they need to generate type II/III radio emissions remain. This project involves various ground-based solar radio observatories such as MUSER and space-based missions. The figure on the right represents a coronal shock wave driven by the erupting CME. The outermost bright front indicates the shock front, followed by a bright sheath region.
Publications:
Cheng, X., Zhang, J., Olmedo, O., et al., 2012, ApJL 745, L5
Su, W., Cheng, X., Ding, M. D., et al., 2015, ApJ 804, 88
Su, W., Cheng, X., Ding, M. D., et al., 2016, ApJ 830, 70
Wan, L., Cheng, X., Shi, T., Su, W., Ding, M. D., 2016, ApJ 826, 174
Kou, Y. K., Jing, Z. C., Cheng, X., et al. 2020, ApJL, 898, 24
Flare_Type3_CME_list
近期论文
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10. Xing, C., Cheng, X.* & Ding, M. D., The Evolution of the Toroidal Flux of CME Flux Ropes During Eruption, The Innovation 2020, 3, 100059
9. Cheng, X.*; Zhang, J.; Kliem, B.; Torok, T.; Xing, C.; Zhou, Z. J.; Inhester, B.; Ding, M. D., Initiation and Early Kinematic Evolution of Solar Eruptions, ApJ 2020, 894, 85
8. Cheng, X.*; Li, Y.; Wan, L. F.; Ding, M. D.; Chen, P. F.; Zhang, J.; Liu, J. J., Observations of Turbulent Magnetic Reconnection within a Solar Current Sheet, ApJ 2018, 866, 64.
7. Cheng, X.*; Ding, M. D.; Fang, C., Imaging and Spectroscopic Diagnostics on the Formation of Two Magnetic Flux Ropes Revealed by SDO/AIA and IRIS. ApJ 2015, 804, 82.
6. Sun, J. Q.; Cheng, X.*; Ding, M. D.; Guo, Y.; Priest, E. R.; Parnell, C. E.; Edwards, S. J.; Zhang, J.; Chen, P. F.; Fang, C., Extreme ultraviolet imaging of three-dimensional magnetic reconnection in a solar eruption. Nature Communications 2015, 6, 7598.
5. Cheng, X.*; Ding, M. D.; Zhang, J.; Sun, X. D.; Guo, Y.; Wang, Y. M.; Kliem, B.; Deng, Y. Y., Formation of a Double-decker Magnetic Flux Rope in the Sigmoidal Solar Active Region 11520.ApJ 2014, 789, 93.
4. Cheng, X.*; Zhang, J.; Ding, M. D.; Liu, Y.; Poomvises, W., The Driver of Coronal Mass Ejections in the Low Corona: A Flux Rope. ApJ 2013, 763, 43.
3. Zhang, J.; Cheng, X.; Ding, M. D., Observation of an evolving magnetic flux rope before and during a solar eruption. Nature Communications 2012, 3, 747.
2. Cheng, X.; Zhang, J.; Saar, S. H.; Ding, M. D., Differential Emission Measure Analysis of Multiple Structural Components of Coronal Mass Ejections in the Inner Corona. ApJ 2012, 761, 62.
1. Cheng, X.; Zhang, J.; Liu, Y.; Ding, M. D., Observing Flux Rope Formation During the Impulsive Phase of a Solar Eruption. ApJL 2011, 732, 25.
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