Basic classification of NEMO Events

 

EUV Dimmings during Eruptions

EIT waves
  • Magnetic topology
  • Type
  dipolar   Slow <V> = 130 km/s
  quadrupolar, etc   Fast   <V> = 900 km/s
  free (corrupted) shape  
  • Morphology
  • Morphology
# class area intensity # class geometry solar condition
1 Small High 1 Assymmetrical/symmetrical Freely propagating
2 Large Weak 2 Assymmetrical/symmetrical Interacting with  ARs

Dimmings as coronal magnetic field probe

Webb and Hudson, 2000; Attrill et al, 2006

                        

                       Dimming formation                  Dipolar dimming (Attrill et al. 2006)           Quadrupolar Dimming (NEMO, 2006)

         NEMO