澳大利亚维多利亚州周末天空出现虹彩云现象，在墨尔本郊区威弗利山和卡罗琳温泉被目击者拍摄记录。1 虹彩云通常由卷云形成，卷云由冰晶组成，存在于对流层较高层。1 澳大利亚气象局高级气象学家莎拉·斯卡利解释，光线围绕冰晶衍射产生彩虹外观，这种现象发生在新形成的云中，当冰晶大小相同时尤为明显。1
斯卡利指出，虹彩云与日晕不同，后者是阳光经水晶在大气中的折射和反射产生的光柱现象。1 她表示"人们不经常注意到它们，因为它们转瞬即逝"。1 虽然这种现象在澳大利亚并不罕见，但很少被记录下来。1
Iridescent clouds painted the sky over parts of Victoria during the weekend, with observers capturing images of the optical phenomenon in the Melbourne suburbs of Waverley and Caroline Springs.1 These clouds, known as iridescent or "rainbow clouds," form when light diffracts around ice crystals in newly formed clouds, producing their distinctive multicolored appearance.1
The phenomenon typically originates in cirrus clouds, which are composed of ice crystals located in the higher levels of the troposphere.1 According to Sarah Scally, a senior meteorologist at the Australian Bureau of Meteorology, the effect occurs when ice crystals of uniform size scatter light in a specific way.1 Scally explained that iridescent clouds differ from halos—which are created by the refraction and reflection of sunlight through atmospheric crystals—and noted that while such displays are not uncommon in Australia, they are rarely documented.1 "People don't often notice them because they're fleeting," Scally said, highlighting why these atmospheric events frequently go unrecorded despite their occurrence.1
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