Investigation of Umbral Dots with the New Vacuum Solar Telescope

@article{Ji2015InvestigationOU,
  title={Investigation of Umbral Dots with the New Vacuum Solar Telescope},
  author={Kaifan Ji and Xia Jiang and Song Feng and Yunfei Yang and Hui Deng and Feng Wang},
  journal={Solar Physics},
  year={2015},
  volume={291},
  pages={357-369}
}
Umbral dots (UDs) are small isolated brightenings observed in sunspot umbrae. They are convective phenomena existing inside umbrae. UDs are usually divided into central UDs (CUDs) and peripheral UDs (PUDs) according to their positions inside an umbra. Our purpose is to investigate UD properties and analyze their relationships, and further to find whether or not the properties depend on umbral magnetic field strengths. Thus, we selected high-resolution TiO images of four active regions (ARs… Expand

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References

SHOWING 1-10 OF 37 REFERENCES
Properties of umbral dots as measured from the new solar telescope data and MHD simulations
We studied bright umbral dots (UDs) detected in a moderate size sunspot and compared their statistical properties to recent MHD models. The study is based on high-resolution data recorded by the NewExpand
CHARACTERISTIC DEPENDENCE OF UMBRAL DOTS ON THEIR MAGNETIC STRUCTURE
Umbral dots (UDs) were observed in a stable sunspot in NOAA 10944 by the Hinode Solar Optical Telescope on 2007 March 1. The observation program consisted of blue continuum images andExpand
Brightness, distribution, and evolution of sunspot umbral dots
Context. Umbral Dots (UDs) are thought to be manifestations of magnetoconvection in sunspot umbrae. Recent advances in their theoretical description point to the need for a thorough study of theirExpand
Fine structure in sunspots. II. Intensity variations and proper motions of umbral dots
Temporal intensity variations of umbral dots (UDs) and dark nuclei (DNs), and proper motions of UDs, were analyzed in a 4 1/2 hour time series of high resolution white light images of the umbra in aExpand
Properties of simulated sunspot umbral dots
Realistic 3D radiative MHD simulations reveal the magneto-convective processes underlying the formation of the photospheric fine structure of sunspots, including penumbral filaments and umbral dots.Expand
Identifying and Tracking of Peripheral and Central Umbral Dots
Umbral dots (UDs) are small isolated brightening observed in sunspot umbrae. They are usually classified into peripheral UDs (PUDs) and central UDs (CUDs) according to their positions inside anExpand
Morphology and evolution of umbral dots and their substructures
Substructures - dark lanes and tails - of umbral dots (UDs) were predicted by numerical simulations of magnetoconvection. We analyse a 6 h 23 min time series of broadband images of a large umbra inExpand
Sunspots and the physics of magnetic flux tubes. IX. Umbral dots and longitudinal overstability
Observations of the transient umbral dots that commonly appear in sunspots suggest that the dots are tiny inslands of gas near normal photospheric temperatures. Each dot appears to be an upwardExpand
Observations of Dark Lanes in Umbral Fine Structure from the Hinode Solar Optical Telescope: Evidence for Magnetoconvection
An analysis of high-resolution G-band images of active region NOAA 10930 is presented. The observations were recorded with the Broadband Filter Imager (BFI) attached to the Solar Optical TelescopeExpand
Magnetoconvection in a sunspot umbra
Results from a realistic simulation of three-dimensional radiative magnetoconvection in a strong background magnetic field corresponding to the conditions in sunspot umbrae are shown. The convectiveExpand
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