Microwave and Hard X-Ray Observations of the 2017 September 10 Solar Limb Flare

We report the first science results from the newly completed Expanded Owens Valley Solar Array (EOVSA), which obtained excellent microwave (MW) imaging spectroscopy observations of SOL2017-09-10, a classic partially occulted solar limb flare associated with an erupting flux rope. This event is also well-covered by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) in hard X-rays (HXRs). We present an overview of this event focusing on MW and HXR data, both associated with high-energy nonthermal electrons, and we discuss them within the context of the flare geometry and evolution revealed by extreme ultraviolet observations from the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory. The EOVSA and RHESSI data reveal the evolving spatial and energy distribution of high-energy electrons throughout the entire flaring region. The results suggest that the MW and HXR sources largely arise from a common nonthermal electron population, although the MW imaging spectroscopy provides information over a much larger volume of the corona.

我们报告了新建成的扩展欧文斯谷太阳阵列（EOVSA）的首批科学成果，该阵列对SOL2017 - 09 - 10进行了出色的微波（MW）成像光谱观测，这是一次与爆发的磁通量绳相关的经典的部分被掩食的太阳边缘耀斑。此次事件也被用于硬X射线（HXRs）观测的罗文·拉马蒂高能太阳光谱成像仪（RHESSI）很好地覆盖。我们对此次事件进行了综述，重点关注与高能非热电子相关的微波和硬X射线数据，并在太阳动力学天文台搭载的大气成像组件（AIA）的极紫外观测所揭示的耀斑几何结构和演化的背景下对其进行了讨论。EOVSA和RHESSI的数据揭示了整个耀斑区域内高能电子不断变化的空间和能量分布。结果表明，微波和硬X射线源在很大程度上来自共同的非热电子群，尽管微波成像光谱提供了关于日冕更大体积的信息。