挪威上空的AZURE蒸汽示踪剂
影像来源与版权:Yang Sutie

说明:天空中发生了什么?上周五,挪威北部上空的大气发生了非常奇怪的现象,当时突然出现了彩云、光斑和羽流,持续时长大约30分钟。这些颜色实际上是由NASA资助的极光区气流上涌火箭实验(AZURE)产生的,该实验释放气体示踪剂用来探测地球上层大气中的风系。AZURE示踪剂来源于挪威Andøya太空中心发射的两枚短期探空火箭。无害气体三甲基铝和钡/锶混合物被释放到海拔高度为115和250千米的电离层。我们从数个地面基站可以观测到蒸汽示踪剂的消散。测绘AZURE蒸汽示踪剂是如何消散的,将会增加人类对太阳风是如何把能量传输到地球并激发极光的理解。
翻译:北京天文馆

AZURE Vapor Tracers over Norway
Image Credit & Copyright: Yang Sutie

Explanation: What’s happening in the sky? The atmosphere over northern Norway appeared quite strange for about 30 minutes last Friday when colorful clouds, dots, and plumes suddenly appeared. The colors were actually created by the NASA-funded Auroral Zone Upwelling Rocket Experiment (AZURE) which dispersed gas tracers to probe winds in Earth’s upper atmosphere. AZURE’s tracers originated from two short-lived sounding rockets launched from the Andøya Space Center in Norway. The harmless gases, trimethylaluminum and a barium/strontium mixture, were released into the ionosphere at altitudes of 115 and 250 km. The vapor trails were observed dispersing from several ground stations. Mapping how AZURE’s vapors dispersed should increase humanity’s understanding of how the solar wind transfers energy to the Earth and powers aurora.
Astronomy Picture of the Day 04/08/2019