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Simultaneous detection of flare-associated kink oscillations and extreme-ultraviolet waves

Science China(Technological Sciences) 2024年第5期67卷 1592-1601页

作者： LI Dong HOU ZhenYong BAI XianYong LI Chuan FANG Matthew ZHAO HaiSheng WANG JinCheng ning zongjun Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing210023China Yunnan Key Laboratory of the Solar Physics and Space Science Kunming650216China School of Earth and Space Sciences Peking UniversityBeijing100871China National Astronomical Observatories Chinese Academy of SciencesBeijing100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing100049China School of Astronomy and Space Science Nanjing UniversityNanjing210023China Key Laboratory of Modern Astronomy and Astrophysics Ministry of EducationNanjing UniversityNanjing210023China Columbus Academy GahannaOhio43230USA Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China Yunnan Observatories Chinese Academy of SciencesKunming650216China

Kink oscillations,which are frequently observed in coronal loops and prominences,are often accompanied by extreme-ultraviolet(EUV)***,much more needs to be explored regarding the causal relationships between kink oscillations and EUV *** this article,we report the simultaneous detection of kink oscillations and EUV waves that are both associated with an X2.1 flare on 2023 March 03(SOL2023-03-03T17:39).The kink oscillations,which are almost perpendicular to the axes of loop-like structures,are observed in three coronal loops and one *** short loop shows in-phase oscillation within the same period of 5.2 min at three *** oscillation could be triggered by the pushing of an expanding loop and interpreted as the standing kink *** lags are found between the kink oscillations of the short loop and two long loops,suggesting that the kink wave travels in different *** kink oscillations of one long loop and the prominence are possibly driven by the disturbance of the coronal mass ejection(CME),and that of another long loop might be attributed to the interaction of the EUV *** onset time of the kink oscillation of the short loop is nearly same as the beginning of an EUV *** fact demonstrates that they are almost *** EUV wave is most likely excited by the expanding loop structure and shows two *** leading component is a fast coronal wave,and the trailing one could be due to the stretching magnetic field lines.

关键词： coronal loops solar flares solar prominence solar oscillations extreme-ultraviolet wave magnetohydrodynamic

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Investigation of the Oscillations in a Flare-productive Active Region

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Research in Astronomy and Astrophysics 2022年第10期22卷 180-188页

作者： Fanpeng Shi zongjun ning Dong Li Key Laboratory of Dark Matter and Space Science Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210033China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

We investigate the oscillations in active region(AR)NOAA 12891,which produces a C2.0 three-ribbon flare accompanying a jet on 2021 November *** the data from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory,the 5 minutes decayless kink oscillations of coronal loops were detected and they are independent of the solar *** on the observed oscillations and seismological diagnostics,we estimate that the Alfvén speed and magnetic field in these coronal loops are around 466 kms^(-1) sand 7.6 G,***,the flare-related jet shows its plasmoids with 1 minute periodicity same as the intensity fluctuation of nearby flare *** correlation between the intensity fluctuation of jet and that of flare ribbon indicates that their 1 minute oscillations should originate from the same reconnection process.

关键词： Sun activity-Sun oscillations-Sun UV radiation Online material animation

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Persistent fast kink magnetohydrodynamic waves detected in a quiescent prominence

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Science China(Physics,Mechanics & Astronomy) 2022年第3期65卷 122-130页

作者： Dong Li Jianchao Xue Ding Yuan zongjun ning Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China CAS Key Laboratory of Solar Activity National Astronomical ObservatoriesBeijing 100101China Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen 518055China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

Small-scale, cyclic, transverse motions of plasma threads are usually seen in solar prominences, which are often interpreted as magnetohydrodynamic(MHD) waves. Here, we observed small-scale decayless transverse oscillations in a quiescent prominence, and they appear to be omnipresent. The oscillatory periods of the emission intensity and a proxy for the line-of-sight Doppler shift are about half period of the displacement oscillations. This feature agrees well with the fast kink-mode waves in a flux tube. All the moving threads oscillate transversally spatially in phase and exhibit no significant damping throughout the visible segments, indicating that the fast kink MHD waves are persistently powered and ongoing dissipating energy is transferred to the ambient plasma in the quiet corona. However, our calculations suggest that the energy taken by the fast kink MHD waves alone can not support the coronal heating on the quiet Sun.

关键词： the Sun corona prominence magnetohydrodynamic(MHD)waves

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Power conversion factor in solar flares

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Chinese Science Bulletin 2012年第12期57卷 1397-1404页

作者： ning zongjun Key Laboratory of Dark Matter and Space Astronomy Chinese Academy of SciencesNanjing 210008China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008China

With RHESSI data from five solar flares taken from beginning to end,we investigate the power conversion factorμdefined as the ratio of the time derivative of total thermal energy(ERHESSI+Erad+Econd)and the kinetic power(PRHESSI)of nonthermal ***, ERHESSI is the computed energy contained in thermal plasmas traced by RHESSI *** two contributions(Erad and Econd)to the total energy are the energies lost through radiation and conduction,both of which can be derived from the observational *** both are not considered,μis only positive before the SXR ***,we find that for each flare studiedμis positive over the whole duration of the soalr flare after taking into account both radiation and *** values forμrange from 11.7% to 34.6%for these five events,indicating roughly that about this fraction of the known energy in nonthermal electrons is efficiently transformed into thermal energy from start to *** fraction is traced by RHESSI SXR observations;the rest is *** bulk of the nonthermal energy could heat the plasma low in the atmosphere to drive mass flows(*** evaporation).

关键词：太阳耀斑转换因子电源热等离子体总能量转换系数时间导数非热电子

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The investigation of the Neupert effect in two solar flares

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Science China(Physics,Mechanics & Astronomy) 2009年第11期52卷 1686-1690页

作者： ning zongjun Purple Mountain Observatory, Nanjing 210008, China Purple Mountain Observatory Nanjing China

The Neupert effect suggests a flare model in which the nonthermal emissions are produced by energetic electrons which heat lower corona and chromosphere to produce the thermal emissions. Based on this concept, we investigate the Neupert effect to test the correlation between the hard X-ray spectral index and the time rate of the UV flare area at 1600 or 171 . Using the T RACE and RHESSI observations, we explore these quantities for two solar flares, one on March 14, 2002 and the other on November 1, 2003. The negative dependence between the spectral index and the time rate of the UV flare area is found, especially during the hard X-ray sub-peaks. This finding indicates that the electron-beam-driven heating plays a prominent role in the UV emission of these two flares.

关键词： solar flares UV radiation X-rays

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An investigation of flare emissions at multiple wavelengths

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Research in Astronomy and Astrophysics 2021年第3期21卷 149-157页

作者：李东 Alexander Warmuth 卢磊宁宗军 Key Laboratory for Dark Matter and Space Science Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210033China CAS Key Laboratory of Solar Activity National Astronomical ObservatoriesBeijing 100101China State Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China Leibniz-Institut für Astrophysik Potsdam(AIP) An der Sternwarte 1614482 PotsdamGermany School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

We report multi-wavelength observations of four solar flares on 2014 July *** firstly select these flares according to the soft X-ray(SXR)and extreme ultraviolet(EUV)emissions recorded by the Extreme Ultraviolet Variability Experiment and Geostationary Orbiting Environmental S *** their locations and geometries are identified from the full-disk images measured by the Atmospheric Imaging Assembly(AIA),and the time delays among the light curves in different channels are *** electron number densities are estimated using the differential emission measure *** find that three of four flares show strong emissions in SXR channels and high temperature(>6 MK)EUV wavelengths during the impulsive phase,i.e.,AIA 131 A and 94 A,and then they emit peak radiation subsequently in the middle temperature(~0.6-3 MK)EUV ***,they last for a long time and have smaller electron densities,which are probably driven by the interaction of hot diffuse flare *** one flare emits radiation at almost the same time in all the observed wavelengths,lasts for a relatively short time,and has a larger electron *** is also accompanied by a typeⅢradio *** bright emission at the EUV channel could be corresponding to the associated erupting filament.

关键词： Sun:flares Sun:radio radiation Sun:UV radiation Sun:X-rays,gamma rays

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模糊数学综合评价结合响应面法优化竹笋汁饮品发酵工艺

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中国酿造 2024年第6期43卷 176-181页

作者：李珂高宁张飞谭旭袁滨锋张美云李宗军湖南农业大学食品科学技术学院湖南长沙410128 湖南农业大学湖南省食品科学与生物技术重点实验室湖南长沙410128 湖南惊石农业科技有限公司湖南益阳413400

该研究以清水竹笋罐头生产过程中产生的清水为原料,以发酵乳杆菌(Lactobacillus fermentium)与红茶菌为菌种复合发酵制备竹笋汁饮品。利用单因素试验、模糊数学综合评价结合响应面法对其发酵工艺进行优化,并对其理化指标、微生物指标及... 详细信息

该研究以清水竹笋罐头生产过程中产生的清水为原料,以发酵乳杆菌(Lactobacillus fermentium)与红茶菌为菌种复合发酵制备竹笋汁饮品。利用单因素试验、模糊数学综合评价结合响应面法对其发酵工艺进行优化,并对其理化指标、微生物指标及抗氧化性进行检测分析。结果表明,竹笋汁饮品的最佳发酵工艺为:红茶菌添加量6%、发酵温度25℃、发酵时间2.5 d。在此优化条件下,竹笋汁饮品的色泽均匀,呈浅黄色的基底液,其感官评分为85.24分,固形物含量为6.13 g/L,pH为3.38,总糖含量为0.16 g/L,总酸含量为41.33 g/L,总酚含量为7.74 mg/L,总黄酮含量为0.066 mg/m L;益生菌活菌数为3.5×107CFU/g,大肠菌群、沙门氏菌及霉菌未检出,说明其理化指标及微生物指标均符合T/CASME 435—2023《益生菌发酵植物饮料》。竹笋汁饮品对1,1-二苯基-2-苦基肼(DPPH)自由基清除率为64.03%,羟自由基(·OH)清除率为46.62%,说明其具有一定的抗氧化能力。

关键词：竹笋汁红茶菌复合发酵模糊数学综合评价响应面法发酵工艺理化指标抗氧化性

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深空组合导航中天文测速观测研究

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深空探测学报 2016年第3期3卷 225-227,245页

作者：宁宗军李东戴煜紫金山天文台暗物质与空间实验室南京210008 南京大学天空学院南京210093

深空天文测速导航方法以空间中的某颗恒星为目标,利用航天器自身携带的光谱仪测量相对于恒星的移动速度来实时调整自行速度和路线。太阳是主要的测速导航源之一,利用目前运行的空间卫星的光谱观测资料,分析和研究了太阳相对于卫星的视... 详细信息

深空天文测速导航方法以空间中的某颗恒星为目标,利用航天器自身携带的光谱仪测量相对于恒星的移动速度来实时调整自行速度和路线。太阳是主要的测速导航源之一,利用目前运行的空间卫星的光谱观测资料,分析和研究了太阳相对于卫星的视线速度和速度误差变化情况,为本项目中自主导航光谱提供实测证据。选取了太阳表面5个位置的光谱观测,持续时间在一个小时左右,通过高斯谱线轮廓拟合观测数据,得到了太阳表面5个位置的亮度变化、谱线宽度和速度,其中主要参数速度平均值大约在10 km/s,和速度变化在3 km/s。这是由太阳表面存在大量的微观尺度上的物质运动所导致的。

关键词：组合导航高精度天文测速

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太阳耀斑中的射电漂移结构

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天文研究与技术 2012年第4期9卷 363-365页

作者：宁宗军吴洪傲许富英孟璇中国科学院紫金山天文台江苏南京210008

结合紫金山天文台的太阳射电观测资料,对太阳耀斑中的射电漂移结构进行研究。过去的观测发现,漂移结构太阳耀斑产生的射电爆发伴随一种特殊的结构。观测特征是其中的细结构是由许多小脉冲组成,但整体随时间漂移。过去观测到的这种结构... 详细信息

结合紫金山天文台的太阳射电观测资料,对太阳耀斑中的射电漂移结构进行研究。过去的观测发现,漂移结构太阳耀斑产生的射电爆发伴随一种特殊的结构。观测特征是其中的细结构是由许多小脉冲组成,但整体随时间漂移。过去观测到的这种结构是向低频漂移。观测上他们与太阳耀斑中的等离子团抛射相对应。2003年3月18日,紫金山天文台射电频谱仪观测到的漂移结构是漂向高频。

关键词：太阳耀斑射电爆发漂移结构

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4.5~7.5 GHz太阳射电频谱观测数据集(2002~2013年)

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中国科学数据（中英文网络版） 2016年第2期1卷 30-38页

作者：杨哲睿宁宗军卢磊孟璇高娜刘梁中国科学院紫金山天文台南京210008

太阳是离地球最近的恒星,观测和认识太阳一直是基础天文研究的重要部分。观测发现,太阳自身有大气层,这个大气层由于高温而几乎全部电离成等离子体,加上自生磁场的变化而存在复杂多变的太阳爆发现象,其中最典型的就是太阳耀斑爆发和日... 详细信息

太阳是离地球最近的恒星,观测和认识太阳一直是基础天文研究的重要部分。观测发现,太阳自身有大气层,这个大气层由于高温而几乎全部电离成等离子体,加上自生磁场的变化而存在复杂多变的太阳爆发现象,其中最典型的就是太阳耀斑爆发和日冕物质抛射。观测和研究太阳爆发现象的基本规律和理解其中的物理过程是太阳物理的研究前沿。太阳爆发现象的同时伴随着各波段射电强度的显著变化,对太阳进行不同频率光的射电强度的观测,获取其频谱数据,对太阳爆发现象的研究有重要的意义。太阳射电望远镜可实现宽带多频率同时观测,工作频率在4.5~7.5 GHz,共300个通道,采集速度10 M/s,观测的是这些频率上的太阳射电流量随时间变化的数据。观测得到了2002~2013年的射电频谱数据,已经积累200多个太阳耀斑爆发时期的频谱数据。

关键词：太阳射电多通道频谱图片 IDL fits

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