Astronomy Picture of the Day——日全食下的鸟
Birds During a Total Solar Eclipse
Image Credit & Copyright: LeonardoCaldas
Explanation: What do birds do during atotal solar eclipse? Darkness descends more quickly in a total eclipse thanduring sunset, but returns just as quickly -- and perhaps unexpectedly to theavians -- just a few minutes later. Stories about the unusual behavior of birdsduring eclipses have been told for centuries, but bird reactions were recordedand studied systematically by citizen scientists participating in an eBirdproject during the total solar eclipse that crossed the USA in 2017 August.Although some unusual behaviors were observed, many observers noted birdsacting like it was dusk and either landing or flying low to the ground. Radarconfirmed a significant decrease in high-flying birds and insects during andjust after totality. Conversely, several sightings of normally nocturnal birdswere reported. Pictured, a flock of birds in La Serena, Chile flew through theair together during the total solar eclipse that crossed South America lastweek. The photographer captured the scene in frames from an eclipse video. Thenext total solar eclipse in 2020 December will also cross South America, whilein 2024 April a total solar eclipse will cross North America from Mexicothrough New England, USA.
日全食下的鸟
鸟类在日全食期间会做什么？在日全食发生期间，黑暗降临的速度比日落还要快，但是几分钟后，黑暗又以同样的速度再次褪去，也许这些都超出了鸟类的预知。
关于鸟类在日全食期间发生异常行为的故事已经流传了几个世纪，但是在2017年8月，一次横穿美国的日全食期间，参与一个鸟类项目的民间科学家们对鸟类的反常行为进行了系统地记录和研究。虽然他们观察到一些异常行为，但是许多观察者都注意到鸟类的行为就像黄昏一样，要么降落，要么低飞向地面。雷达证实了高飞的鸟类和昆虫在全食期间和之后都有显著减少。相反，有报道称看到了一些正常夜间活动的鸟类。
在这幅图像中，位于智利拉塞雷纳的一群鸟儿在上周横穿南美洲的日全食期间一起在天空飞翔。摄影师从一段日食视频的各个帧中捕捉到了这幅图象。2020年12月的下一次日全食也将横穿南美洲，而2024年4月的一次日全食将横穿北美洲，从墨西哥穿越到美国的新英格兰。
参考文献：
https://apod.nasa.gov/apod/image/1907/BirdsEclipse_Caldas_3240.jpg
近期文章：
Astronomy Picture of the Day——在射电波下拍摄的银心