gs0709

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gs0709

  1. 1. GenSci Item 07-09 In what part of the atmosphere do auroras occur? A. troposphere B. ionosphere C. exosphere D. stratosphere www.upcatreview.com
  2. 2. GenSci Item 07-09 www.upcatreview.com The ionosphere , which is a layer of ions found between the mesosphere and thermosphere, is formed when UV strips gas atoms of their electrons.
  3. 3. GenSci Item 07-09 www.upcatreview.com When the ionosphere is hit by the solar wind (a jet of fast-moving ions from the sun),
  4. 4. GenSci Item 07-09 ...the ions fluoresce, which is seen as the aurora borealis (Northern hemisphere)... www.upcatreview.com
  5. 5. GenSci Item 07-09 www.upcatreview.com ...or the aurora australis (Southern hemisphere).

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