solar cycle

活跃太阳的黑子

作者： NASA中文 / 2023年7月11日

2023年7月11日 Sunspots on an Active Sun Image Credit: NASA, SDO; Processing & Copyright: Şenol Şanlı Explanation: Why is our Sun so active now? No one is sure. An increase in surface activity was expected because our Sun is approaching solar maximum in 2025. However, last month our Sun sprouted mo […]

天文·每日一图

绿光的国度: 挪威上空的极光

作者： NASA中文 / 2023年1月22日

2023年1月22日 In Green Company: Aurora over Norway Image Credit & Copyright: Max Rive Explanation: Raise your arms if you see an aurora. With those instructions, two nights went by with, well, clouds — mostly. On the third night of returning to same peaks, though, the sky not only cleared up