Improvement of Yohkoh hard x-ray imaging

被引：43
|
作者：
Sato, J [1 ]
Kosugi, T
Makishima, K
机构：
[1] Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan
[2] Univ Tokyo, Sch Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
来源：
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 1999年 / 51卷 / 01期
关键词：
image processing; instruments; sun : flares; sun : X-rays;
D O I：
10.1093/pasj/51.1.127
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Hard X-ray Telescope (HXT) on board Yohkoh is a Fourier-synthesis-type imager for solar flare observations; it measures a set of spatially modulated photon counts with sixty-four, independent, bigrid modulation collimators and an image is reconstructed from these data using sophisticated image synthesis procedures, such as the Maximum Entropy Method (MEM) and PIXON. The HXT-MEM imaging has been greatly improved by incorporating the following three improvements which we have recently achieved: (1) Accurately estimated instrumental response functions (X-ray transmission/modulation patterns), which are made available through self-calibration using solar flares as calibration sources; (2) Improvement of the MEM algorithm, which includes the total flux estimate in its iteration loop; and (3) Accurate error estimate and its proper inclusion in the MEM. Various problems seen in previous HXT-MEM imaging are drastically reduced and high-quality images are obtained.
引用
收藏
页码：127 / 150
页数：24
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