A new auroral phenomenon, the anti-black aurora.
A new auroral phenomenon, the anti-black aurora.
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DOI：
10.1038/s41598-021-81363-9
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发表时间：
2021-01-19
影响因子：
4.6
通讯作者：
Aslaksen T
中科院分区：
文献类型：
--
作者：
Nel AE;Kosch MJ;Whiter D;Gustavsson B;Aslaksen T
黑色极光是嵌入漫射背景极光中的小规模特征，通常发生在磁午夜之后的亚暴后，并伴有向东漂移。与周围的漫射极光相比，黑色极光的光学亮度显着降低，并且可以显示为缓慢移动的弧线或快速移动的斑块和弧段。我们首次报道了一种更加难以捉摸的小规模光学结构，这种结构一直被观察到与 10% 的黑色极光斑块配对出现。亮度增强的斑块或弧段，明显比漫射背景更亮，我们将其称为反黑极光，可能会出现在黑色极光附近。反黑极光的形状和大小相似，并且总是与漂移的黑极光平行移动，尽管它可能会无缘无故地突然改变方向。配对现象总是以相同的平均速度向东方向漂移。从 2016 年 3 月 12 日在挪威特罗姆瑟郊外记录的对该现象的首次双波长（427.8 nm 和 844.6 nm）光学观测结果表明，与漫射背景相比，反黑极光和黑色极光的沉淀电子平均能量分别较高和较低。
Black auroras are small-scale features embedded in the diffuse background aurora, typically occurring post-substorm after magnetic midnight and with an eastward drift imposed. Black auroras show a significant reduction in optical brightness compared to the surrounding diffuse aurora, and can appear as slow-moving arcs or rapidly-moving patches and arc segments. We report, for the first time, an even more elusive small-scale optical structure that has always been observed occurring paired with 10% of black aurora patches. A patch or arc segment of enhanced luminosity, distinctly brighter than the diffuse background, which we name the anti-black aurora, may appear adjacent to the black aurora. The anti-black aurora is of similar shape and size, and always moves in parallel to the drifting black aurora, although it may suddenly switch sides for no apparent reason. The paired phenomenon always drifts with the same average speed in an easterly direction. From the first dual-wavelength (427.8 nm and 844.6 nm) optical observations of the phenomenon recorded on 12 March 2016 outside Tromsø Norway, we show that the anti-black and black auroras have a higher and lower mean energy, respectively, of the precipitating electrons compared to the diffuse background.
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影响因子：
1.9
作者：
Gustavsson, B;Sergienko, T;Holma, H
通讯作者：
Holma, H
影响因子：
2.8
作者：
Tsyganenko, NA
通讯作者：
Tsyganenko, NA
影响因子：
2.8
作者：
Gustavsson, B.;Kosch, M. J.;Blixt, E. M.
通讯作者：
Blixt, E. M.
影响因子：
2.8
作者：
Kosch, MJ;Honary, F;Hagfors, T
通讯作者：
Hagfors, T
DOI：
10.1016/0021-9169(93)90002-g
发表时间：
1993-03-01
期刊：
JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS
影响因子：
--
作者：
RISHBETH, H;VANEYKEN, AP
通讯作者：
VANEYKEN, AP