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Group of Solar atmospheric physics and Coronagraph Technology Development

Solar atmospheric physics

The  solar atmosphere is the part of the Sun above its convective zone,  consisting of photosphere, chromosphere, transition region and corona.  It is the source of space weather that concerns with the time varying  conditions within the Solar System, including the solar wind that is a  stream of charged particles released from the upper atmosphere of the  Sun. Therefore, to understand the formation and the variation of the  space weather, one has to trace back to the solar atmosphere and the  knowledge of the physics of that region is crucial. In another hand, the  solar atmosphere is also a unique physics laboratory where we can study  in detail the interaction between the plasma and the magnetic field  over a variety of spatial and temporal scales that cannot be reproduced  in laboratory.

 

Our research

The  group mainly focuses on two major problems: coronal heating and origin  of the solar wind. The coronal heating problem relates to the question  why the temperature of the Sun's corona is millions of degree higher  than that of the photosphere. Since the second law of thermodynamics  prevents heat conduction directly from the solar photosphere, the high  temperatures require energy to be carried from the solar interior to the  corona by non-thermal processes. The solar wind origin problem is the  question how the supersonic streams of charged particles are released  from the upper atmosphere of the Sun and how they are accelerated in  their source regions.

 

To  study the above problems, the team mainly concentrates on the  observational aspect. One division works on data analyses that focus on  small-scale dynamic events in the solar atmosphere relating to the  coronal heating and the source region of the solar wind. Another  division of the team aims at development of large-angle white-light  coronagraph.

 

Group members

    • Prof. Lidong XIA (principal investigator)

    • Dr. Weixin LIU (faculty)

    • Dr. Zhenghua HUANG (faculty)

    • Dr. Hui FU (faculty)

    • Dr. Mingzhe SUN (postdoc)

    • Dr. Kalogodu CHADRASCHEKAH (Postdoc)

    • Chaozhou MOU (PhD student)

    • Zhenyong HOU (PhD student)

    • Rui DING (Master student)

    • Youqian QI (Master student)


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Lab for coronagraph technology development

 

In-progress projects and grants

1.     Development  of Large-Angle White-Light Coronagraph for the Inner- Heliosphere, NSFC  major project for instrument development, CNY~6100k, 2017.01~2021.12

2.          Source  dependence of the in situ solar wind parameters and spectroscopic  diagnosis of outflows from the quiet Sun, NSFC young scientist project,  CNY240k, 2017.01~2019.12

3.          Physics and modeling of coronal-interplanetary coupling, 973 project (led by NSSC), CNY 1780k, 2012.01~2016.08

4.          Multi-wavelength study of the origin of the nascent solar wind, NSFC general project, CNY800k, 2013.01~2016.12

5.          High-resolution  spectroscopic study of coronal bright points and their associating  phenomena, NSFC general project, CNY900k, 2015.01~2018.12

6.          Observations  of photospheric magnetic cancellation and its response in the higher  solar atmosphere, NSFC young scientist project, CNY250k, 2015.01~2017.12

7.          Observations  of small scale magnetic activities and their contributions to the  coronal heating, Special funding of the China postdoc science  foundation, CNY 150k, 2015.07~2018.07

8.          Study  of the small-scale magnetic activities related to the small-scale  cronal activities, Shandong provincial natural science foundation,  CNY120k, 2014.12~2017.12

 

Recent publications (selected papers from the last two years):

1. Fu,  Hui; Xia, Lidong; Li, Bo; Huang, Zhenghua; Jiao, Fangran; Mou,  Chaozhou, “Measurements of Outflow Velocities in on-disk Plumes from  EIS/Hinode Observations”, ApJ, 794, 109, 2014/10, ADS: http://adsabs.harvard.edu/abs/2014ApJ...794..109F

2. Huang, Zhenghua; Madjarska, Maria S.; Xia, Lidong; Doyle, J. G.; Galsgaard, Klaus; Fu, Hui, ” Explosive Events on a Subarcsecond Scale in IRIS Observations: A Case Study” ApJ, 797, 88, 2014/12, ADS: http://adsabs.harvard.edu/abs/2014ApJ...797...88H

3. Fu,  Hui; Li, Bo; Li, Xing; Huang, Zhenghua; Mou, Chaozhou; Jiao, Fangran;  Xia, Lidong, “Coronal Sources and In Situ Properties of the Solar Winds  Sampled by ACE During 1999 - 2008”, Sol. Phys., 290, 1399, 2015/05, ADS:  http://adsabs.harvard.edu/abs/2015SoPh..290.1399F 

4. Yan, Limei;  He, Jiansen; Xia, Lidong; Jiao, Fangran, “Observational Evidence for  the Causes and Consequences of Chromospheric Reconnection”, ApJ, 804(1),  69, 2015/05, ADS: http://adsabs.harvard.edu/abs/2015ApJ...804...69Y

5. Jiao, Fangran; Xia, Lidong; Li, Bo; Huang, Zhenghua; Li, Xing; Chandrashekhar, Kalugodu; Mou, Chaozhou; Fu, Hui, “Sources of Quasi-periodic Propagating Disturbances above a Solar Polar Coronal Hole”, ApJL, 809, 17, 2015/08, ADS: http://adsabs.harvard.edu/abs/2015ApJ...809L..17J

6. Huang, Zhenghua;  Xia, Lidong; Li, Bo; Madjarska, Maria S. , “Cool Transition Region  Loops Observed by the Interface Region Imaging Spectrograph”, ApJ, 810,  46, 2015/09, ADS: http://adsabs.harvard.edu/abs/2015ApJ...810...46H 

7. Mou,  Chaozhou; Huang, Zhenghua; Xia, Lidong; Madjarska, Maria S.; Li, Bo;  Fu, Hui; Jiao, Fangran; Hou, Zhenyong, “Magnetic Flux Supplement to  Coronal Bright Points”, ApJ, 818, 9, 2016/02, ADS: http://adsabs.harvard.edu/abs/2015ApJ...810...46H

8. Jiao,  Fang-Ran; Xia, Li-Dong; Huang, Zheng-Hua; Li, Bo; Fu, Hui; Yuan, Ding;  Chandrashekhar, Kalugodu, “Damping and power spectra of quasi-periodic  intensity disturbances above a solar polar coronal hole”, RAA, 16, 8,  2016/06, ADS: http://adsabs.harvard.edu/abs/2016RAA....16f...8J 

9. Hou, Zhenyong; Huang, Zhenghua; Xia, Lidong; Li, Bo; Madjarska, Maria  S.; Fu, Hui; Mou, Chaozhou; Xie, Haixia. “Narrow-line-width UV bursts  in the transition region above Sunspots observed by IRIS”, ApJL, 2016,  accepted, http://arxiv.org/abs/1608.04892



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