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首页> 外文期刊>The Astrophysical journal >MECHANISMS AND OBSERVATIONS OF CORONAL DIMMING FOR THE 2010 AUGUST 7 EVENT
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MECHANISMS AND OBSERVATIONS OF CORONAL DIMMING FOR THE 2010 AUGUST 7 EVENT

机译:2010年8月7日事件冠状光斑变的机理和观察

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摘要

Coronal dimming of extreme ultraviolet (EUV) emission has the potential to be a useful forecaster of coronal mass ejections (CMEs). As emitting material leaves the corona, a temporary void is left behind which can be observed in spectral images and irradiance measurements. The velocity and mass of the CMEs should impact the character of those observations. However, other physical processes can confuse the observations. We describe these processes and the expected observational signature, with special emphasis placed on the differences. We then apply this understanding to a coronal dimming event with an associated CME that occurred on 2010 August 7. Data from the Solar Dynamics Observatory's Atmospheric Imaging Assembly and EUV Variability Experiment (EVE) are used for observations of the dimming, while the Solar and Heliospheric Observatory's Large Angle and Spectrometric Coronagraph and the Solar Terrestrial Relations Observatory's COR1 and COR2 are used to obtain velocity and mass estimates for the associated CME. We develop a technique for mitigating temperature effects in coronal dimming from full-disk irradiance measurements taken by EVE. We find that for this event, nearly 100% of the dimming is due to mass loss in the corona.
机译:极紫外(EUV)发射的日冕变暗有可能成为预报日冕物质抛射(CME)的有用工具。当发射材料离开电晕时,会留下一个暂时的空隙,可以在光谱图像和辐照度测量中观察到该空隙。 CME的速度和质量将影响这些观测的特征。但是,其他物理过程可能会混淆观察结果。我们描述了这些过程和预期的观测特征,并特别强调了差异。然后,我们将这种理解应用于2010年8月7日发生的与CME相关的日冕变暗事件。来自太阳动力学天文台的大气成像组件和EUV变异性实验(EVE)的数据用于观察变暗,而太阳和日光层天文台的大角度和光谱日冕仪以及太阳地面关系天文台的COR1和COR2用于获得相关CME的速度和质量估计。我们开发了一种从EVE进行的全盘辐照度测量中缓解冠状调光温度效应的技术。我们发现,对于此事件,几乎100%的调光是由于电晕中的质量损失所致。

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