Note on tracking Sun-Earth connection event

ICME Event: 2011/08/05

Observer: Eleni Nikou on 2019/06

1. ICME
  1.1. Catalog
     # Identified in ICME catalogs: Richardson & Can List
      RC catalog:
      Disturbance start time: 2011/08/05 17:51 UT
      Ejecta      Start time: 2011/08/06 22:00 UT
      Ejecta      End   time: 2011/08/07 22:00 UT
      dv = 180 km/s, v = 540 km/s, vmax= 610 km/s
      MC index:     1
      Dst:        -115 nT
      Suggested source CME: 2011/08/04 04:12 UT
      V_transit:  1100 km/s
      
  1.2. Comments
      Overall ICME quality index: 2
      ICME signatures: Bmax: 6.6 nT
               ICME signatures: u decreases smoothly, low beta, Tp<Texp apart from two peaks, low n
      
      Disturbance time 470 km/s  -> search window 3-4 days -> 2012/02/14-15

2. CME
   2.1. A. Candidate A
    A.1. LASCO:    
      #CME 2011/08/02 06:48 UT, partial halo CME

    A.2 .STEREO: 
           Also seen as a CME in COR2-A and COR2 B (first frame at COR2-A 06:54 UT)
	   Front-side CME

    A.3. AIA & GOES         
	   corresponding flare: M1.4 at 2011/08/02 05:19 UT
	                        flare from AR11261 N16W22 (approximation of the location from Solar Monitor)

    A.4 Comment:  
	   Could be the source: The timing and orientation is in agreement with the observations


   2.1, B, Candidate B
     B.1. LASCO  
       #CME 2011/08/03 14:00 UT, halo CME (from CDAW)
           

     B.2. STEREO
         Also seen as a CME in COR2-A and COR2 B (first frame at COR2-A 13:54 UT)
         front-side CME 

     B.3. AIA & GOES
          #GOES flare M6.0 at 2011/08/03 13:17 UT from AR11261 at N16W30
	
     B.3. Comment
          Could be the source: The timing and orientation is in agreement with the observations
  
   2.2. Comment
        We can observe dimmings for both candidates, but they are relatively small. 

3. Other Comments

     It is not clear which is the candidate, because both events can be the cause of the ICME. What is clear though is that the source region is AR11261.

4. Summary
    SW index 2
    Source index 2
    Overall index 2