ON THE SOLAR CHROMOSPHERE OBSERVED AT THE LIMB WITH HINODE
ON THE SOLAR CHROMOSPHERE OBSERVED AT THE LIMB WITH HINODE
复制标题
日出在边缘观测的太阳色球
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Carlsson
中科院分区：
文献类型：
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作者：
P. Judge;M. Carlsson
从Hinode航天器上的宽带滤光片成像仪(BFI)获得的Ca II H线上的宽带图像显示，从观察到的肢体发出并可见的针状体发出的辐射。令人惊讶的是，在它们的长度上几乎没有看到针状光的吸收。我们给出了给定(特别)源函数的传输方程的形式解，包括从其发出针状物的分层色球。模型参数与早期针状体的研究结果基本一致。在Hinode数据中，向下到肢体的Ca II针状物的可见度似乎要求毛刺发射相对于层化大气的多普勒频移，无论是通过超音速湍流还是有组织的毛刺运动。色球的非针状成分在宽带BFI数据中几乎看不见，但我们预测它将在高光谱分辨率数据中清晰可见。宽频带的Ca II H肢体图像给人一种色球被毛刺支配的假象。我们的分析提醒人们，签名的缺失可能与签名的存在同样重要。
Broadband images in the Ca ii H line, from the Broadband Filter Imager (BFI) instrument on the Hinode spacecraft, show emission from spicules emerging from and visible right down to the observed limb. Surprisingly, little absorption of spicule light is seen along their lengths. We present formal solutions to the transfer equation for given (ad hoc) source functions, including a stratified chromosphere from which spicules emanate. The model parameters are broadly compatible with earlier studies of spicules. The visibility of Ca ii spicules down to the limb in Hinode data seems to require that spicule emission be Doppler shifted relative to the stratified atmosphere, either by supersonic turbulent or organized spicular motion. The non-spicule component of the chromosphere is almost invisible in the broadband BFI data, but we predict that it will be clearly visible in high spectral resolution data. Broadband Ca ii H limb images give the false impression that the chromosphere is dominated by spicules. Our analysis serves as a reminder that the absence of a signature can be as significant as its presence.