A Full-disk Image Standardization of the Chromosphere Observation at Huairou Solar Observing Station
| Autor: | Suo, Liu |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Advances in Space Research 2019 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.asr.2019.10.035 |
| Popis: | 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$\times$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 chromosheric full-disk observations to be used for further scientific investigations. Comment: 10 pages, 8 figures |
| Databáze: | arXiv |
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