史蒂夫在铜港上空
(原标题: STEVE over Copper Harbor)
2021-05-05
浏览次数: 31
是什么造就了史蒂夫？强烈的热发射速度增强（STEVEs）可能自古以来就被发现，但直到最近5年，人们才意识到它们的颜色和形状使它们与极光不同。史蒂夫的起源被看作是粉红色和紫色的单条明亮条纹，至今仍是一个活跃的研究课题。steve可能与亚极光离子漂移有关，亚极光离子漂移是一种由热大气离子组成的超音速河流。由于目前未知的原因，史蒂夫经常伴随着绿色的“尖桩栅栏”极光。这张特色的史蒂夫照片是3月中旬在美国密歇根州铜港连续拍摄的前景和背景曝光的组合。这个明亮的极光持续了几分钟，从一个地平线延伸到另一个地平线，出现在正常极光出现的时间之间。
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What creates STEVEs? Strong Thermal Emission Velocity Enhancements (STEVEs) have likely been seen since antiquity, but only in the past five years has it been realized that their colors and shapes make them different from auroras. Seen as single bright streaks of pink and purple, the origin of STEVEs remain an active topic of research. STEVEs may be related to subauroral ion drifts (SAIDs), a supersonic river of hot atmospheric ions. For reasons currently unknown, STEVEs are frequently accompanied by green "picket-fence" auroras. The featured STEVE image is a combination of foreground and background exposures taken consecutively in mid-March from Copper Harbor, Michigan, USA. This bright STEVE lasted several minutes, spanned from horizon to horizon, and appeared in between times of normal auroras.
© MaryBeth Kiczenski