Title : 'Helium emission in a dynamic sun'
       
Objective :
                 
   Obtain the spectral signature of transients (Spicules ?) in helium 
   lines observed by SUMER
                 
   Monitor the dynamic of the emitting elements in a reduced EIT field 
   of view . Identify the emitting features.
                 
Duration:  one hour

Cadence:   20 sec
       
Procedure:
       
   1) EIT :   high cadence (20 sec) subfields (128 X 128 pixels ) 
	      surrounding the SUMER slit

                * field of view  335 X 335 arcsec
                * in the 304 HeII line  (reduced exposure time : 10 sec !!)
                * shutterless mode
                      
   2) SUMER : long narrow slit (0.3sec X 300sec) (360 pixels)

                * two lines observed on 50 spectral pixels each
                * high cadence (20 sec)
                * 36000 pixels transmitted to ground every 20 sec
                  the transmission time should be 1.5 hour per 1-hour 
		  observation (a buffer is being used to accomodate the 
		  data flow) 
                                            
                  lines observed :
                      
                      A)
                      
                      HeI 584 A second order
                      +  CIII  1175 A 
                      
                      B)
                      
                      HeII 1084.9 A  + NII 1085.1 A   
                      +  SIV  1073 A          
                      
Proposed dates:    
     
   June 15   18h -19h UT   (before bakeout ?)
   June 19   18h -19h UT   (after bakeout)
   [NOTE:  June 15 & 16 selected starting at 13 UT each day]
                       
Position :  

   On the disk in a quite region (TBD)
   The SUMER slit is at  - 300 sec  East of disk center  
                       

                     JP Delaboudiniere (With help from P. Lemaire)
                                   
                                      June 7 2000