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FIRST GAMMA-RAY IMAGES OF A SOLAR FLARE

机译:太阳耀斑的第一幅伽玛射线图像

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Imaging of gamma-ray lines, produced by nuclear collisions of energetic ions with the solar atmosphere, provides the only direct indication of the spatial properties of accelerated ions near the Sun. We present the first gamma-ray images of a solar flare, obtained with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) for the X4.8 flare of 2002 July 23. Two rotating modulation collimators (with 35″ and 183″ resolution) were used to obtain images for the same time interval in four energy bands: the narrow deuterium line at 2.223 MeV formed by the thermalization and capture of neutrons produced in the collisions; the 3.25-6.5 MeV band that includes the prompt de-excitation lines of C and O; and the 0.3-0.5 and 0.7-1.4 MeV bands that are dominated by electron bremsstrahlung. The centroid of the 2.223 MeV image was found to be displaced by 20″ +- 6″ from that of the 0.3-0.5 MeV image, implying a difference in acceleration and/or propagation between the accelerated electron and ion populations near the Sun.
机译:由高能离子与太阳大气的核碰撞产生的伽马射线线的成像,提供了加速离子在太阳附近的空间特性的唯一直接指示。我们展示了2002年7月23日用鲁汶拉玛特高能太阳光谱成像仪(RHESSI)获得的X4.8耀斑的太阳耀斑的第一幅伽马射线图像。两个旋转调制准直仪(分辨率分别为35英寸和183英寸)分别用于在四个能带中获得相同时间间隔的图像:通过碰撞产生的中子的热化和俘获形成的2.223 MeV的窄氘线; 3.25-6.5 MeV频段,其中包括C和O的快速消磁线;和0.3-0.5和0.7-1.4 MeV波段,由电子致辐射所主导。发现2.223 MeV图像的质心与0.3-0.5 MeV图像的质心偏移了20“ +-6”,这意味着加速的电子和离子群在太阳附近的加速和/或传播有所不同。

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