Does a Weaker Sun Mean a Warmer Earth?
Thursday, October 7, 2010 - 16:00
in Astronomy & Space
The sun controls Earth's climate, bathing us in light ranging from ultraviolet to visible that warms the planet and drives the heat engines we know as weather systems and ocean currents. The sun is changeable, cycling from maximum to minimum outputs over a roughly 11-year cycle, increasing or decreasing the amount of light that reaches Earth as a result of the poorly understood aspects of the sun's seething nuclear fusion. Now new satellite measurements reveal that from 2004 to 2007--the declining phase of an unusually low and prolonged solar minimum--the sun put out even less ultraviolet light than expected but compensated by putting out more visible light. [More]