SAR弧和银河系
(原标题: The SAR Arc and the Milky Way)
2023-11-11
浏览次数: 18
这条宽阔明亮的红色弧线在法国北部部分多云的夜空中是一道令人惊讶的风景线。在11月5日从西向东的马赛克图像中，向天顶延伸的微弱大气光带是稳定极光红（SAR）弧的一个例子。这种罕见的夜空现象在世界各地的低纬度地区也被发现，在强烈的地磁风暴期间，还会出现更动态的极光现象。通过公民科学和卫星调查研究了SAR弧及其与极光发射的关系。从远高于正常极光的高度，深红色的SAR辐射被认为是由地球内部磁层中流动的电流引起的强烈加热引起的。在这张SAR图的另一边，银河在地平线上的云层上呈弧形，是法国北部夜空的常客。
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This broad, luminous red arc was a surprising visitor to partly cloudy evening skies over northern France. Captured extending toward the zenith in a west-to-east mosaic of images from November 5, the faint atmospheric ribbon of light is an example of a Stable Auroral Red (SAR) arc. The rare night sky phenomenon was also spotted at unusually low latitudes around world, along with more dynamic auroral displays during an intense geomagnetic storm. SAR arcs and their relation to auroral emission have been explored by citizen science and satellite investigations. From altitudes substantially above the normal auroral glow, the deep red SAR emission is thought to be caused by strong heating due to currents flowing in planet Earth's inner magnetosphere. Beyond this SAR, the Milky Way arcs above the cloud banks along the horizon, a regular visitor to night skies over northern France.
© Julien Looten