巴尔干中央国家公园的布罗肯现象，保加利亚

:copyright: Maya Karkalicheva/Getty Image

山上的幽灵

万圣节快到了，今天的照片也非常应景，展示了一只“幽灵”，也就是布罗肯现象。尽管看着灵异，但布罗肯现象并非超自然现象。这是一位观察者被投射在阳光对面云层上的阴影。布罗肯现象很少见，但如果你在黎明时分爬上薄雾弥漫的山坡，则有可能幸运地目睹这种现象。只要满足条件，布罗肯现象可以出现在任何地方。在德国哈尔茨山脉的布罗肯峰，当地传说浓雾弥漫的山间有幽灵出没。1780年，约翰·西尔伯施拉格在此观察到了“幽灵”，对其进行了描述记录，并将其命名为“布罗肯现象”。此后，布罗肯现象便常常被记录在有关该地区的文献之中。

Brocken spectre in Central Balkan National Park, Bulgaria

:copyright: Maya Karkalicheva/Getty Image

A ghost on the mountain. Brocken spectre in Central Balkan National Park, Bulgaria

With Halloween around the corner, we present the ghostly image of a Brocken spectre. Despite appearances and the season, there's nothing paranormal about a Brocken spectre. It's the magnified shadow of an observer cast in midair upon a cloud opposite a strong light source. Brocken spectres are rare but climb a mountain at dawn up to the misty slopes and you may be fortunate enough to witness the effect. The spectre, also known as a Brocken bow, mountain spectre, or spectre of the Brocken, can appear anywhere in which conditions are right—like here in the Balkans of Bulgaria. But it's the thick fogs of the Brocken, a peak in the Harz Mountains in Germany, from which the phenomenon draws its name.