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Text File  |  1999-10-22  |  127b  |  13 lines
  1. Because of magnetic flux 
  2.  
  3. Because of D-region absorption
  4.  
  5. Because of auroral propagation
  6.  
  7. Because of a lack of activity
  8.  
  9.  
  10.  
  11. 3
  12.  
  13.