Multi-Thermal analysis of Solar Dynamic Events Using Differential Emission Measure

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/69358

Title:	Multi-Thermal analysis of Solar Dynamic Events Using Differential Emission Measure
Authors:	林岳翰;Lin,Yueh-Han
Contributors:	太空科學研究所
Keywords:	CME;filament;SAD;DEM;CME;filament;SAD;DEM
Date:	2016-01-21
Issue Date:	2016-03-17 18:57:30 (UTC+8)
Publisher:	國立中央大學
Abstract:	此篇論文是研究三種動態太陽事件的溫度和電漿密度變化，分別為:日冕物質拋射 (CME)、日珥噴發(filament eruption)和supra-arcade downflows (SADs)，並試圖計算三種事件的速度和能量。我們採用Differential Emission Measure (DEM)的方法完成研究，並使用Hannah & Kontar 2012發展的程序和Atmospheric Imaging Assembly on Solar Dynamics Observatory (AIA/SDO)的EUV 影像去計算DEM的結果。我們研究和Hannah & Kontar 2013同樣的2010年11月3日CME事件，在我們的結果中，CME主要由溫度在6-16MK的電漿組成，噴發速度大約630±100 km⁄s，CME的core的能量大約〖10〗^28 erg，CME的stem的能量大約〖10〗^27 erg，此結果和普遍研究指出的CME能量大約少了兩個數量級，我們推測此差距源自於我們的研究是計算部分區域CME的能量。在2012年4月15日的filament eruption研究結果指出，filament主要由溫度在0.5-4MK和8-20MK的電漿組成，噴發速度大約420±40 km⁄s。在2011年10月22日的SAD事件研究結果指出，SAD主要由溫度在8-16MK的電漿組成，並且SAD的電將密度會隨者靠近太陽表面時有所增長，SAD移動的速度大約100±10 km⁄s。;The objective of this study is to understand the density and temperature structures of three types of solar dynamic events: Coronal Mass Ejection (CME), filament eruption, and supra-arcade downflows (SADs), and to examine their velocity, kinetic energy, and thermal energy. To accomplish the objectives, we use the Differential Emission Measure (DEM) computation procedures developed by Hannah & Kontar 2012 and the EUV images from the Atmospheric Imaging Assembly on Solar Dynamics Observatory (AIA/SDO) to calculate DEM. The CME event on 2010 November 3 is the same event studied by Hannah & Kontar 2013. In our result, the CME of core and stem are mainly composed of plasma at the temperature range 6-16MK, and the CME velocity is approximately 630±100 km⁄s. Both of kinetic and thermal energy of the core are approximately 〖10〗^28 erg, and those of the stem are approximately 〖10〗^27 erg, which are more than 2 orders of magnitude smaller than the average CME kinetic energy. It could be because we only calculated the energy of part of the CME structure. The result of the filament on 15th April 2012 reveals that this filament is mainly composed of plasma at the temperature intervals 0.5-4MK and 8-20MK, and the filament eruption velocity is approximately 420±40 km⁄s. The result of the SADs on 2011 Oct 22 shows that those SADs are mainly composed of plasma at the temperature range 8-16MK, the plasma density of the SAD at this temperature range increased with time as the SAD moved toward the flare arcade, and the SAD velocity is approximately 100±10 km⁄s.
Appears in Collections:	[Graduate Institute of Space Science] Department of Earth Sciences

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