November 11, 2011: Solar Variability and the Sun-Earth Connection

The Sun’s evolving magnetic field causes variations in solar irradiance, heliospheric wind, and geospace conditions that range from seconds-long explosions to billion-year trends. Traces of that variability can be found in Galileo’s drawings and ancient ice sheets, while observations of stars like the Sun provide glimpses of what the Sun did through the ages. This observational material guides us towards an understanding of the root of solar activity – the dynamo – needed to understand the Sun-Earth connections.

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