Segmentation of loops from coronal EUV images

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳高能及相关物理过程研究团组

	Segmentation of loops from coronal EUV images
	Inhester, B.1; Feng, L.1 ; Wiegelmann, T.1
刊名	SOLAR PHYSICS
	2008-04-01
卷号	248 期号:2 页码:379-393
关键词	EUV images coronal magnetic fields image processing
ISSN号	0038-0938
英文摘要	We present a procedure to extract bright loop features from solar EUV images. In terms of image intensities, these features are elongated ridge-like intensity maxima. To discriminate the maxima, we need information about the spatial derivatives of the image intensity. Commonly, the derivative estimates are strongly affected by image noise. We therefore use a regularized estimation of the derivative, which is then used to interpolate a discrete vector field of ridge points; these "ridgels" are positioned on the ridge center and have the intrinsic orientation of the local ridge direction. A scheme is proposed to connect ridgels to smooth, spline-represented curves that fit the observed loops. Finally, a half-automated user interface allows one to merge or split curves or eliminate or select loop fits obtained from this procedure. In this paper we apply our tool to one of the first EUV images observed by the SECCHI instrument onboard the recently launched STEREO spacecraft. We compare the extracted loops with projected field lines computed from near-simultaneous magnetograms measured by the SOHO/MDI Doppler imager. The field lines were calculated by using a linear force-free field model. This comparison allows one to verify faint and spurious loop connections produced by our segmentation tool and it also helps to prove the quality of the magnetic-field model where well-identified loop structures comply with field-line projections. We also discuss further potential applications of our tool such as loop oscillations and stereoscopy.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	MAGNETIC-FIELD EXTRAPOLATIONS ; CURVILINEAR STRUCTURES ; RECONSTRUCTION ; TRANSFORM
收录类别	SCI ; ISTP
语种	英语
WOS记录号	WOS:000255115700013
公开日期	2011-12-29
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1875]
专题	紫金山天文台_太阳高能及相关物理过程研究团组
作者单位	1.Max Planck Inst Sonnensystemforsch, D-37191 Katlenburg Lindau, Germany 2.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Inhester, B.,Feng, L.,Wiegelmann, T.. Segmentation of loops from coronal EUV images[J]. SOLAR PHYSICS,2008,248(2):379-393.
APA	Inhester, B.,Feng, L.,&Wiegelmann, T..(2008).Segmentation of loops from coronal EUV images.SOLAR PHYSICS,248(2),379-393.
MLA	Inhester, B.,et al."Segmentation of loops from coronal EUV images".SOLAR PHYSICS 248.2(2008):379-393.