Analysis of the Fe X and Fe XIV line width in the solar corona using LASCO-C1 spectral data
Analysis of the Fe X and Fe XIV line width in the solar corona using LASCO-C1 spectral data
复制标题
使用 LASCO-C1 光谱数据分析日冕中的 Fe X 和 Fe XIV 线宽
DOI：
10.1051/0004-6361:20078329
复制
发表时间：
2008
影响因子：
6.5
通讯作者：
B. Podlipnik
中科院分区：
文献类型：
--
作者：
M. Mierla;R. Schwenn;L. Teriaca;G. Stenborg;B. Podlipnik
目标。本文利用SOHO上LASCO-C1的光谱资料，分析了内日冕（1.1R以上区域）谱线宽度随高度的变化。我们使用的数据获得的活动最低（1996年8月至10月），并在上升阶段的太阳周期（1998年3月）。方法. LASCO-C1在不同波长下获得的一系列图像横跨Fe X 637.6 nm（红色）和Fe XIV 530.3 nm（绿色）日冕线，使我们能够建立离边日冕的辐射率和宽度图。结果在1996年，Fe XIV的线宽大致不变或随高度增加至约1.3 R，然后减小。Fe x线宽随高度增加，直到光谱噪声太大而无法进行线宽测量（约1.3 R Ω）。与Fe XIV相比，Fe X显示出更高的有效温度。在1998年，Fe XIV的谱线宽度大致上与边缘以上的高度相同（没有Fe X的数据）。
Aims. The purpose of this paper is to analyze the variation in the line width with height in the inner corona (region above 1.1 R ⊙ ), by using the spectral data from LASCO-C1 aboard SOHO. We used data acquired at activity minimum (August-October 1996) and during the ascending phase of the solar cycle (March 1998). Methods. Series of images acquired at different wavelengths across the Fe X 637.6 nm (red) and Fe XIV 530.3 nm (green) coronal lines by LASCO-C1 allowed us to build radiance and width maps of the off-limb solar corona. Results. In 1996, the line width of Fe XIV was roughly constant or increased with height up to around 1.3 R ⊙ and then it decreased. The Fe x line width increased with height up to the point where the spectra were too noisy to allow line width measurements (around 1.3 R ⊙ ). Fe X showed higher effective temperatures as compared with Fe XIV. In 1998 the line width of Fe XIV was roughly constant with height above the limb (no Fe X data available).