Abstract Observations of local features in the solar chromosphere began in 1992 at Huairou Solar Observing Station, while the full-disk chromosphere observations were carried out since 2000. In order to facilitate researchers to use full-disk chromosphere observation, algorithms have been developed to standardize the full-disk images. The algorithms include the determination of the center of the image and size standardization, geometric correction and intensity normalization. The solar limb of each image is determined from a histogram analysis of its intensity distribution. The center and radius are then calculated and the image is corrected for geometric distortions. Images are re-scaled to have a fixed radius of 500 pixels and centered within the 1024 × 1024 frame. Finally, large-scale variations in intensity, such as limb-darkening, are removed using a median filter. This paper provides a detailed description of these algorithms, and a summary of the properties of these chromospheric full-disk observations to be used for further scientific investigations.
A full-disk image standardization of the chromosphere observation at Huairou Solar Observing Station
Advances in Space Research ; 65 , 3 ; 1054-1061
2019-10-26
8 pages
Article (Journal)
Electronic Resource
English
Vector magnetic field measurement at Huairou and helicity of active regions
Online Contents | 2007
|The polar extension of the solar chromosphere
British Library Online Contents | 1998
|Empirical Solar Wind Forecasting from the Chromosphere
British Library Conference Proceedings | 2006
|Increasing solar chromosphere line intensities with solar activity
Elsevier | 1985
|