Development of technique to detect and classify small-scale magnetic flux cancellation and rapid blue-shifted excursions  

作　　者：Xin Chen Na Deng Derek A.Lamb Ju Jing Chang Liu Rui Liu Sung-Hong Park Haimin Wang 

机构地区：[1]Space Weather Research Laboratory, New Jersey Institute of Technology, University Heights [2]Southwest Research Institute [3]CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China [4]Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens [5]Korea Astronomy and Space Science Institute

出　　处：《Research in Astronomy and Astrophysics》2015年第7期1012-1026,共15页天文和天体物理学研究（英文版）

基　　金：supported by NASA under grants NNX11AO70G, NNX13AF76G and NNX14AC12G;NSF under grants AGS 1153226, 1250374, 1348513 and 1408703;partially supported by NASA grants NNX08AJ06G and NNX11AP03;supported through the project "SOLAR-4068" which is implemented under the "ARISTEIA Ⅱ" Action of the operational programme "Education and Lifelong Learning";co-funded by the European Social Fund (ESF);National funds

摘　　要：We present a set of tools for detecting small-scale solar magnetic cancellations and the disk counterpart of type II spicules（the so-called Rapid Blueshifted Excursions（RBEs））, using line-of-sight photospheric magnetograms and chromospheric spectroscopic observations, respectively. For tracking magnetic cancellation,we improve the Southwest Automatic Magnetic Identification Suite（SWAMIS） so that it is able to detect certain obscure cancellations that can be easily missed. For detecting RBEs, we use a normalized reference profile to reduce false-positive detections caused by the non-uniform background and seeing condition. Similar to the magnetic feature tracking in SWAMIS, we apply a dual-threshold method to enhance the accuracy of RBE detection. These tools are employed to analyze our coordinated observations using the Interferometric BIdimensional Spectrometer at the Dunn Solar Telescope of the National Solar Observatory and Hinode. We present the statistical properties of magnetic cancellations and RBEs, and explore their correlation using this data set.We present a set of tools for detecting small-scale solar magnetic cancellations and the disk counterpart of type II spicules（the so-called Rapid Blueshifted Excursions（RBEs））, using line-of-sight photospheric magnetograms and chromospheric spectroscopic observations, respectively. For tracking magnetic cancellation,we improve the Southwest Automatic Magnetic Identification Suite（SWAMIS） so that it is able to detect certain obscure cancellations that can be easily missed. For detecting RBEs, we use a normalized reference profile to reduce false-positive detections caused by the non-uniform background and seeing condition. Similar to the magnetic feature tracking in SWAMIS, we apply a dual-threshold method to enhance the accuracy of RBE detection. These tools are employed to analyze our coordinated observations using the Interferometric BIdimensional Spectrometer at the Dunn Solar Telescope of the National Solar Observatory and Hinode. We present the statistical properties of magnetic cancellations and RBEs, and explore their correlation using this data set.

关 键 词：Sun： chromosphere -- Sun： magnetic fields 

分 类 号：P182[天文地球—天文学]