How common is Aurora Borealis?

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Tags

  1. #lights
  2. #current
  3. #occurred
  4. #prevalent
  5. #which
  6. #aurora
  7. #borealis
  8. #solar
  9. #maximum
  10. #passed
  11. #generally
  12. #active
  13. #means
  14. #northern
  15. #during
  16. #either
  17. #speaking
  18. #stage
  19. #remain
  20. #effectively
  21. #three
  22. #years