arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.1075astro-ph.SR
收藏

活动区过渡区环的粒子数及其与日冕的关系

Active region transition region loop populations and their relationship to the corona

Ignacio Ugarte-Urra, Harry P. Warren, David H. Brooks

摘要:

不同温度下冕环结构之间的关系尚未确定。先前的研究表明,在活动区域的核心,日冕环不会通过较低的温度冷却,因此会稳定地加热。如果环是冷却的,过渡区将是一个理想的温度制度,以寻找其演变的签名。日出号上的极紫外成像光谱仪(EIS)以前所未有的节奏和空间分辨率提供太阳过渡区和日冕的单色图像,使其成为揭示这一问题的理想仪器。对2007年12月8 - 19日活动区10978的观测分析表明,活动区存在两种主要的环群:核心多温环,在0.4 - 2.5MK甚至更高的温度范围内经历连续的加热和冷却过程,如X射线望远镜(XRT)所示;以及主要在0.4 - 1.3MK温度范围内演化的外围环。在过渡区温度的环可以达到150毫米的高度,在冠以上的肢体和发展下降流的速度在39 - 105公里/秒的范围内。

英文摘要:

The relationships among coronal loop structures at different temperatures is not settled. Previous studies have suggested that coronal loops in the core of an active region are not seen cooling through lower temperatures and therefore are steadily heated. If loops were cooling, the transition region would be an ideal temperature regime to look for a signature of their evolution. The Extreme-ultraviolet Imaging Spectrometer (EIS) on Hinode provides monochromatic images of the solar transition region and corona at an unprecedented cadence and spatial resolution, making it an ideal instrument to shed light on this issue. Analysis of observations of active region 10978 taken in 2007 December 8 -- 19 indicates that there are two dominant loop populations in the active region: core multi-temperature loops that undergo a continuous process of heating and cooling in the full observed temperature range 0.4-2.5 MK and even higher as shown by the X-Ray Telescope (XRT); and peripheral loops which evolve mostly in the temperature range 0.4-1.3 MK. Loops at transition region temperatures can reach heights of 150 Mm in the corona above the limb and develop downflows with velocities in the range of 39-105 km/s.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑