Investigating the relationship between nonthermal electron properties and geoeffective Lyman-alpha emission in solar flares

研究太阳耀斑中非热电子特性与地效莱曼α发射之间的关系

基本信息

  • 批准号:
    2641258
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    英国
  • 项目类别:
    Studentship
  • 财政年份:
    2021
  • 资助国家:
    英国
  • 起止时间:
    2021 至 无数据
  • 项目状态:
    未结题

项目摘要

Solar flares are intense eruptive events that involve the rapid release of large quantities of stored energy in the solar atmosphere, promoting the emission of excess radiation in multiple wavelengths including X-ray and Extreme Ultraviolet (EUV). The Lyman-alpha line of neutral hydrogen is the most intense emission line in the solar spectrum and is known to constitute a considerable portion of the total radiated energy in solar flares. Interest in the study of Lyman-alpha has increased in recent years, due to the improved availability of observations at this wavelength on flare timescales. In quiescent solar conditions, Lyman-alpha radiation is known to form and maintain the D-region of Earth's ionosphere through ionisation of constituent elements and recent studies have suggested that Lyman-alpha emitted during solar flares has a significant role in the formation of currents in the E-region. Perturbations to the ionosphere can have adverse effects on navigation and communication systems, thus understanding the radiation responsible for these effects is crucial to space weather and atmospheric research. Furthermore, in understanding the effects of excess radiation on Earth, extension can be made to other planetary atmospheres, aiding the rapidly developing search for habitable exoplanets.It is generally accepted that accelerated nonthermal electrons colliding with the chromosphere are responsible for the emission of excess radiation during solar flares. However, flares of identical x-ray magnitudes, occurring at similar locations on the solar disk, can show significantly different corresponding Lyman-alpha responses. Thus, the primary objective of this research is to study how the properties of nonthermal electrons influence the corresponding Lyman-alpha (and other EUV line and continua) emission profiles in solar flares. To do this, multi-wavelength spectroscopic observations of solar flares at similar locations on the solar disk taken simultaneously from RHESSI, GOES and SDO will be analysed using bespoke computational software, developed by teams at NASA Goddard Space Flight Centre. This will allow for the diagnosis of flare-related nonthermal electron properties, the estimation of deposited energy in the chromosphere and comparison to the radiative losses in Lyman-alpha and other EUV components of flare radiation. This data will also act as observational input for state-of-the-art radiative-hydrodynamic and atmospheric models, which will allow investigation into the discrepancies between predicted Lyman-alpha emission profiles and those observed by space-based instruments. Ultimately, this research will provide a better understanding of how fundamental properties of accelerated electrons in solar flares can dictate their levels of geoeffectiveness.This research coincides with a rise in solar activity as Solar Cycle 25 commences. In future, this research will guide the interpretation of future Lyman-alpha data sets from the new generation of X-ray and Lyman alpha instruments on board solar missions from NASA, ESA, and JAXA, as well as provide a tool for future developments to radiative-hydrodynamic and atmospheric models.
太阳耀斑是强烈的爆发事件,涉及太阳大气中大量储存的能量的快速释放,促进多个波长的过量辐射的发射,包括X射线和极紫外线(EUV)。中性氢的莱曼-阿尔法线是太阳光谱中最强的发射线,已知占太阳耀斑总辐射能量的相当大一部分。近年来,由于在耀斑时间尺度上对该波长的观测的可用性有所提高,对莱曼α研究的兴趣有所增加。在静止的太阳条件下,莱曼-α辐射已知通过组成元素的电离形成和维持地球电离层的D区,最近的研究表明,太阳耀斑期间发射的莱曼-α辐射在E区电流的形成中起着重要作用。电离层扰动可能对导航和通信系统产生不利影响,因此了解造成这些影响的辐射对空间气象和大气研究至关重要。此外,在理解地球上过量辐射的影响时,可以将其扩展到其他行星的大气层,这有助于快速发展的对可居住系外行星的搜索。人们普遍认为,加速的非热电子与色球层碰撞是太阳耀斑期间过量辐射的原因。然而,在太阳盘面上类似位置发生的相同x射线星等的耀斑,可以显示出明显不同的对应莱曼α响应。因此,本研究的主要目标是研究非热电子的性质如何影响太阳耀斑中相应的莱曼α(和其他EUV线和连续)发射轮廓。为此,将使用美国航天局戈达德空间飞行中心小组开发的定制计算软件,对从RHESSI、GOES和SDO同时拍摄的太阳盘上类似位置的太阳耀斑多波长光谱观测进行分析。这将允许诊断与耀斑相关的非热电子特性,估计色球层中的沉积能量,并与莱曼α和耀斑辐射的其他EUV分量中的辐射损失进行比较。这些数据还将作为最先进的辐射-流体动力学和大气模型的观测投入,从而能够调查预测的莱曼-阿尔法发射分布与天基仪器观测到的分布之间的差异。最终,这项研究将更好地了解太阳耀斑中加速电子的基本特性如何决定其地球效应水平。这项研究恰逢太阳活动周期25开始时太阳活动增加。今后,这项研究将指导对来自美国航天局、欧空局和日本宇宙航空研究开发机构太阳能飞行任务上新一代X射线和莱曼阿尔法仪器的未来莱曼阿尔法数据集的解释,并为辐射流体动力学和大气模型的未来发展提供工具。

项目成果

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其他文献

吉治仁志 他: "トランスジェニックマウスによるTIMP-1の線維化促進機序"最新医学. 55. 1781-1787 (2000)
Hitoshi Yoshiji 等:“转基因小鼠中 TIMP-1 的促纤维化机制”现代医学 55. 1781-1787 (2000)。
  • DOI:
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    0
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LiDAR Implementations for Autonomous Vehicle Applications
  • DOI:
  • 发表时间:
    2021
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
生命分子工学・海洋生命工学研究室
生物分子工程/海洋生物技术实验室
  • DOI:
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    0
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吉治仁志 他: "イラスト医学&サイエンスシリーズ血管の分子医学"羊土社(渋谷正史編). 125 (2000)
Hitoshi Yoshiji 等人:“血管医学与科学系列分子医学图解”Yodosha(涉谷正志编辑)125(2000)。
  • DOI:
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    0
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Effect of manidipine hydrochloride,a calcium antagonist,on isoproterenol-induced left ventricular hypertrophy: "Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,K.,Teragaki,M.,Iwao,H.and Yoshikawa,J." Jpn Circ J. 62(1). 47-52 (1998)
钙拮抗剂盐酸马尼地平对异丙肾上腺素引起的左心室肥厚的影响:“Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,
  • DOI:
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    0
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的其他文献

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