Also included will be any variations that have arisen from volcanic activity, solar activity, and, possibly, human activities.

这还将包括火山活动、太阳活动，可能还有人类活动引起的任何变化。

youdao

In addition to the internal variability of the global climate system itself, there is the added factor of external influences, such as volcanoes and solar activity.

除了全球气候系统本身的内部变化之外，还有外部影响的附加因素，如火山和太阳活动。

youdao

Another is solar activity.

二是取决于太阳的活动程度。

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Gerald Meehl says a better understanding of solar activity and its influence on weather may help researchers predict long-term weather conditions.

VOA: special.2009.09.29

They found the highest levels of solar activity cause small, but far-reaching effects on weather systems around the world.

VOA: special.2009.09.29

He says his team showed the effects of a new process to understand what happens in the Pacific's warm waters where there is a maximum of solar activity.

VOA: special.2009.09.29

Petersburg, solar activity is waning, so the average yearly temperature will begin to decline as well.

FORBES: To The Horror Of Global Warming Alarmists, Global Cooling Is Here

Dr Hathaway notes a widespread misconception that solar activity varies every 11 years "like a pure sinusoid".

BBC: Sun, Trace

Curiosity flew to Mars during a period of low to moderate solar activity.

NPR: Astronauts Face Radiation Threat On Long Mars Trip