X-rays from the Sun

  title={X-rays from the Sun},
  author={Christoph U. Keller},
  • C. Keller
  • Published 1 July 1995
  • Physics
  • Experientia
X-ray astronomy began in 1948 with the first detection of X-rays from the Sun. Astronomical X-ray observations need to be performed from high-altitude rockets and satellites because the Earth's atmosphere absorbs X-rays. Currently about 100,000 X-ray sources are known all over the sky. The Sun is by far the strongest source. The outermost solar atmosphere, the corona, emits X-rays due to its high temperature of a few million K. Solar X-ray emission is highly variable. Eruptions lead to… 
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