Note on tracking Sun-Earth connection event

ICME Event: 2011/09/22

Observer: Eleni Nikou on 2019/06

1. ICME
  1.1. Catalog
     # Identified in ICME catalogs: Richardson & Can List
      RC catalog:
      Disturbance start time: 2011/09/22 03:00 UT
      Ejecta      Start time: 2011/09/22 15:00 UT
      Ejecta      End   time: 2011/09/23 03:00 UT
      dv = 20 km/s, v = 390 km/s, vmax= 420 km/s
      MC index:     1
      Dst:        -29 nT
      Suggested source CME: 2011/09/19
      V_transit:  -
      
  1.2. Comments
      Overall ICME quality index: 3
      ICME signatures: Bmax: 5.7 nT
               ICME signatures: low beta, smooth B at 19:00 UT - 00:00 UT
      
      Disturbance time 390 km/s  -> search window 4 days -> 2011/09/18

2. CME
   2.1. A. Candidate A
    A.1. LASCO:    
      #CME 2011/09/19 06:00:06 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: 19-Sep-2011 04:52 UT
           class of the flare:  C2.4   at AR11296, N24E03
	                        

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

           The dimmings are very small. Also, some of the AIA data at 193A and 211A are of poor quality.
   

3. Other Comments

     Sun was very active on 2011/09/19. CDAW gives a partial halo CMEs on 2011/09/19 at 00:24:07 UT and 22:24:06 UT, but they are related to a back-side CMEs. There is one more back-side event starting at 12:24 UT (COR2-A).

4. Summary
    SW index 3
    Source index 3
    Overall index 3