XPost: sci.physics   
   From: henry@spsystems.net   
      
   In article ,   
   Martha H Adams  wrote:   
   >My question is, what directions does this radiation come in from; and   
   >if you're on some body, what cyclical variation do you see?   
      
   Galactic cosmic rays essentially come in from all directions uniformly;   
   their paths are randomized by interaction with the galactic magnetic   
   field.  The only significant variation in intensity is due to solar   
   activity:  there are fewer of them near solar maximum, presumably because   
   the stronger solar wind and its associated magnetic fields have some   
   tendency to fend them off from the inner solar system.   
      
   >The case for shielding sounds pretty good; but if I were there, I   
   >wouldn't yet know where best to put it.   
      
   All over.  The only direction in which you don't need shielding is down,   
   if you are on a planetary surface.   
   --   
   MOST launched 30 June; first light, 29 July; 5arcsec    | Henry Spencer   
   pointing, 10 Sept; first science, early Oct; all well.  | henry@spsystems.net   
      
   --- SoupGate-Win32 v1.05   
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