Note on tracking Sun-Earth connection event

ICME Event: 2011/10/07

Observer: Eleni Nikou on 2019/06

1. ICME
  1.1. Catalog
     # Identified in ICME catalogs: Richardson & Can List
      RC catalog:
      Disturbance start time: 2011/10/07 02:47 UT
      Ejecta      Start time: 2011/10/07 02:00 UT
      Ejecta      End   time: 2011/10/07 17:00 UT
      dv = 0 km/s, v = 380 km/s, vmax= 390 km/s
      MC index:     0
      Dst:        -33 nT
      Suggested source CME: -
      V_transit: -
      
  1.2. Comments
      Overall ICME quality index: 3
      ICME signatures: Bmax: 5.6 nT
               ICME signatures: Tp<Texp, low n
      
      Disturbance time 380 km/s  -> search window 4 days -> 2011/10/03

   2. CME
   2.1. A. Candidate A
    A.1. LASCO:    
      #CME 2011/10/02 around 02:24 UT, partial/ halo CME
           

    A.2. STEREO: 
           Also seen as a CME in COR2-A and COR2 B (first frame at COR2-A 01:54 UT)
	   Front-side CME

    A.3. AIA & GOES
	   corresponding flare:  2-Oct-2011 00:37 UT 
           class: M3.9 from AR11305 at N09W12   

    A.4 Comment:  
	   Based on the timing and CDAW velocity it is a slow event.
  


   2.1, B. Candidate B
     B.1. LASCO  
       #CME 2011/10/03 00:24 UT, partial halo (???)
           

     B.2. STEREO
         front-side CME 
         Also seen as a CME in COR2-A (first frame at COR2-A 00:24 UT), it appears in COR2-B later. 

     B.3. AIA & GOES
          #GOES flare  3-Oct-2011 00:20 UT, class: C7.6 from AR11302 at N14W55

	
     B.3. Comment
          Could be the source: The timing and orientation is in agreement with the observations.  
  
   2.2. Comment


3. Other Comments

     This is not a clear event and the source region can't be easilt identified.
     Not extended dimming areas in both cases.

     Candidate A is a possibility since it appears to be a slow event and the time needed to arrive at 1AU matches with the time we saw the disturbance in situ.

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