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arXiv 1505.03384astro-ph.SR
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MK 10以上太阳耀斑带的脉冲加热

Impulsive Heating of Solar Flare Ribbons Above 10 MK

Paulo J. A. Simões, David R. Graham, Lyndsay Fletcher

摘要:

色球层对耀斑能量输入的响应以扩展的极紫外(EUV)带和硬X射线(HXR)足点为标志。这些现象通常被解释为在稠密的色球等离子体中加速的电子碰撞产生的加热和韧致辐射的结果。我们提出的证据,脉冲加热的耀斑带在10 MK以上的双带耀斑。利用太阳动力学天文台(SDO)大气成像仪(AIA)和Ramaty高能太阳光谱成像仪(RHESSI)的观测数据,分析了C2. 6级太阳耀斑SOL 2013 -11- 09 T06:38的脉冲相,得到了耀斑区的温度、辐射测度和微分辐射测度,并研究了耀斑带中等离子体的演化.该带在所有SDO/AIA EUV/UV波长下都是可见的,特别是在94和131 nm滤光片下,对8 MK和12 MK的温度敏感。10 MK以上的等离子体的发射测量的时间演化在带的HXR峰值时间附近有一个峰值。RHESSI成像光谱分析进一步证实了低层大气中热等离子体的存在,它显示了与至少一个带状物相关的11-13 MK的解析源。我们发现,碰撞束加热只能勉强解释所需的功率加热的10 MK等离子体在带状。

英文摘要:

The chromospheric response to the input of flare energy is marked by extended extreme ultraviolet (EUV) ribbons and hard X-ray (HXR) footpoints. These are usually explained as the result of heating and bremsstrahlung emission from accelerated electrons colliding in the dense chromospheric plasma. We present evidence of impulsive heating of flare ribbons above 10 MK in a two-ribbon flare. We analyse the impulsive phase of SOL2013-11-09T06:38, a C2.6 class event using data from Atmospheric Imaging Assembly (AIA) on board of Solar Dynamics Observatory (SDO) and the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) to derive the temperature, emission measure and differential emission measure of the flaring regions and investigate the evolution of the plasma in the flaring ribbons. The ribbons were visible at all SDO/AIA EUV/UV wavelengths, in particular, at 94 and 131 Å filters, sensitive to temperatures of 8 MK and 12 MK. Time evolution of the emission measure of the plasma above 10 MK at the ribbons has a peak near the HXR peak time. The presence of hot plasma in the lower atmosphere is further confirmed by RHESSI imaging spectroscopy analysis, which shows resolved sources at 11-13 MK associated with at least one ribbon. We found that collisional beam heating can only marginally explain the necessary power to heat the 10 MK plasma at the ribbons.

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