H alpha cloud removing method based on quite sun chromospheres background processing

Abstract

The invention relates to a cloud removing method of a full-disk H alpha observing system, and aims at solving the problem that the cloud removing method of the full-disk H alpha observing system is discussed a little in the sun actual measurement science in the world at present, and cloud data are generally directly deleted in most of the ground observation. The cloud removing method is the first cloud removing method used for sun structure during the full-disk observation for the first time in domestic, which increases the acquiring and capturing quantity of solar flare data in the future. According to the method, a special background image is constructed through residual information of limb darkening of the quite sun in the cloud coverage data, and then the original data and the background image are utilized to generate flat field data highly close to the cloud absorption characteristics to repair the image. The method has the characteristics that the mathematical method adopted is determined according to a sun physical mode, rather than mathematically reconstructing the digital image blindly; the data which cannot be repaired are provided with quality mark after considering the cloud effect in light of the similar CCD flat field, and the data which can be repaired are repaired. The experiment performed at a plurality of times in the Huairou solar observing station of National Astronomical Observatories of China verifies that the method can be widely applied to the foundation full-disk telescope observing systems for various photospheres and chromospheres wave bands; the method is currently mainly used for repairing the data with cloud flare.

Description

technical field [0001] The invention belongs to the technical field of solar observation, in particular to a global cloud removal method suitable for an all-sun observation system in cloudy areas. The invention belongs to the field of solar observation in astronomy. Background technique [0002] The full-helix Hα observation has a history of hundreds of years, from the early photography to the current CCD digital imaging. Because the excitation potential of this spectral line is very small and there is a large amount of hydrogen on the sun, the explosions on the sun can basically be observed at Hα, which is why it has been going on for more than 100 years. In the early days of observatory stations, they were often sparsely populated places, so there was little dust and water vapor in the sky, and the site selection of the early sun often did not pay attention to evaluating the deterioration of cloud cover in the next few decades (reference [1]). In the later stage, due to ...

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to address the deficiencies in existing manual observations, and provide a later-stage cloud removal method for solar observations, thereby canceling the observation suspension caused by clouds in the full-sun surface manual observations, and increasing the probability of capturing flares. It is an important step for the automation of ground-based full-helix Hα observation, and fills the technical gap of existing solar observation in China

Images