A study on surges: I. Automatic detection of dynamic H alpha dark features from high-cadence full-disk observations

	A study on surges: I. Automatic detection of dynamic H alpha dark features from high-cadence full-disk observations
	Liu, Y ; Kurokawa, H ; Kitai, R ; Ueno, S ; Su, JT
刊名	SOLAR PHYSICS
	2005-05-01
卷号	228 期号:1-2 页码:149-164
英文摘要	We present a new method for the automatic identification and classification of dynamic H alpha dark features found in time series of full-disk solar images at three H alpha wavelengths (center, and +/- 0.8 angstrom). The simultaneous H alpha observations are obtained by the multi-channel Flare Monitoring Telescope (FMT) at Hida Observatory. The program was developed in order to replace the present visual detection and classification of the phenomena. Usually, an obvious dark feature found in the H alpha -0.8 angstrom observations probably corresponds to some phenomenon such as a surge or chromospheric network enhancement, or filament activity. Thus, one of our aims in this program is to distinguish each phenomenon by its own properties and key parameters. We optimized the threshold values of the key parameters such as the area and darkness of the transiently darkening features in H alpha -0.8 angstrom so that the computer can reasonably identify surges and filament activations. In comparison, for a 7-day observation period, the number of dark events detected by the program contains 89% of the events recognized visually. However, 10 times more events are detected automatically. The missing events are mainly caused by the deletion of data with poor visibility. It is found that the dark events can be identified with more precise starting and ending times by a machine than by a human. Some statistical studies of surges or other activities can be carried out based on the computer-produced database. With some modifications the program can be applied to monitor real-time dynamic features on disk, including flare ribbons.
收录类别	SCI
语种	英语
WOS记录号	WOS:000232206100011
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6987]
专题	国家天文台_太阳物理研究部
作者单位	1.Kyoto Univ, Kwasan & Hida Observ, Yamashima Ku, Kyoto 6078471, Japan 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Liu, Y,Kurokawa, H,Kitai, R,et al. A study on surges: I. Automatic detection of dynamic H alpha dark features from high-cadence full-disk observations[J]. SOLAR PHYSICS,2005,228(1-2):149-164.
APA	Liu, Y,Kurokawa, H,Kitai, R,Ueno, S,&Su, JT.(2005).A study on surges: I. Automatic detection of dynamic H alpha dark features from high-cadence full-disk observations.SOLAR PHYSICS,228(1-2),149-164.
MLA	Liu, Y,et al."A study on surges: I. Automatic detection of dynamic H alpha dark features from high-cadence full-disk observations".SOLAR PHYSICS 228.1-2(2005):149-164.