2020年9月17日

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Solar Cycle 25 Has Begun
Image Credit:
NASA, SDO

Explanation: The general trend of monthly sunspot data now confirms that the minimum of the approximately 11 year cycle of solar activity occurred in December 2019, marking the start of Solar Cycle 25. That quiet Sun, at minimum activity, appears on the right of this split hemispherical view. In contrast, the left side shows the active Sun at the recognized maximum of Solar Cycle 24, captured in April 2014. The extreme ultraviolet images from the orbiting Solar Dynamics Observatory highlight coronal loops and active regions in the light of highly ionized iron atoms. Driving the space weather around our fair planet, Solar Cycle 24 was a relatively calm one and predictions are that cycle 25 will be calm too. The cycle 25 activity maximum is expected in July 2025. Solar Cycle 1, the first solar cycle determined from early records of sunspot data, is considered to begin with a minimum in February 1755.

Tomorrow’s picture: 3D Orion


太阳黑子第25周期
影像提供:
NASA,SDO

说明:每月太阳黑子数据的变化趋势证实,约11年周期的太阳活动的极小值已经在2019年12月出现,这也标志着第25太阳活动周的开始。这张圆形图像的右半侧,是处于活动极小期的宁静太阳。与之形成对比的左侧图像,则是拍摄于2014年4月、正处于第24太阳活动周中最活跃阶段的太阳。太阳动力学观测台所拍摄的极紫外照片里,高度电离的铁原子所发出的光线将冕环与活动区域呈现出来。太阳会对我们这颗行星周围的空间天气产生影响。第24太阳活动周是相对平静的,而根据预测,第25太阳活动周也将比较平静,它的极期预计会出现在2025年7月。太阳活动的第一个周期是根据早期太阳黑子的记录确定的,始于1755年2月的太阳活动极小期。

明日的图片:3D Orion

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