Recently, Mohe—the northernmost city in China—witnessed a rare aurora display during the traditional solar term ‘Dahan’ (Great Cold), with vivid red and green lights dancing across the night sky, captivating social media users nationwide. Dahan, the final of China’s 24 solar terms, typically marks the coldest period of the year, and Mohe’s high-latitude location and long winter nights create ideal conditions for aurora viewing.This spectacular event was triggered by heightened solar activity: a coronal mass ejection caused a geomagnetic storm, exciting oxygen and nitrogen atoms in Earth’s upper atmosphere. These atoms then emitted green light (around 557.7 nm) and red light (around 630 nm), producing the dazzling auroral curtains. Although Mohe lies outside the typical auroral oval, intense geomagnetic storms can expand the visibility zone southward, making it one of the few places in China where auroras can occasionally be seen.Many tourists and photographers traveled specifically to Mohe to witness this extraordinary natural phenomenon. Experts caution that aurora sightings are unpredictable and depend on both solar activity forecasts and local weather conditions. This ‘Great Cold Encounter’ not only offered a visual feast but also sparked public interest in space weather and astronomical events.
近日，中国最北端的漠河市在大寒节气期间迎来了一场罕见的极光奇观，红绿交织的极光在夜空中舞动，刷爆社交平台，引发广泛关注。大寒作为二十四节气中的最后一个节气，通常意味着一年中最寒冷的时期，而漠河地处高纬度地区，冬季黑夜漫长，为观测极光提供了理想条件。此次极光现象源于太阳活动增强，日冕物质抛射引发地磁暴，使地球高层大气中的氧和氮原子受激发，分别释放出绿色（约557.7纳米）和红色（约630纳米）的光，形成绚丽多彩的极光带。漠河虽不在传统极光带内，但在强地磁活动期间，极光可见范围南扩，使其成为国内少数能观测到极光的地方之一。不少游客和摄影爱好者专程赶赴漠河，只为一睹这难得的自然奇景。专家提醒，极光出现具有不确定性，需结合太阳活动预报与当地天气状况综合判断。此次‘大寒奇遇’不仅是一场视觉盛宴，也唤起了公众对空间天气和天文现象的兴趣。
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