Big Questions for Yohkoh
Yohkoh, an observatory for studying X-rays and gamma-rays from the Sun, is a project of the Institute for Space and Astronautical Sciences, Japan.
- How and why does the Sun vary and what are the consequences?
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The Sun varies in every way we can observe it. The Sun give off light in the infrared, visible, ultraviolet, and at x-ray energies, and it gives off magnetic field, bulk plasma (the solar wind) and energetic particles moving up to nearly the speed of light, and all of these emissions vary. These variations occur on timescales from fractions of a second to hundreds of years and longer.