Ch 08-02 Sunspots and Solar Activities

• Sunspots
  
  • Appearances
    
    
    
    
    
  • Zeeman effect
    
    
    Sunspots are regions on the solar photosphere where the temperature is lower (down to 4000 K) and the magnetic field is stronger (up to 1000 Gauss).
     
  • Periodicity, polarity
    
     
• Prominances, filaments
  
   
  
   
• Solar flares
  
  
  
  
  
• Corona mass ejections (CME)
  
  [play movie] The ejection in the movie takes about hours. CME material may reach the Earth in a few days if it comes towards us.
  
  More can be found at the web site of SOHO and SDO.