Note on tracking Sun-Earth connection event

ICME Event: 2011/01/24

Observer: Eleni Nikou on 2019/05

1. ICME
  1.1. Catalog
     # Identified in ICME catalogs: Richardson & Can List
      RC catalog:
      Disturbance start time: 2011/01/24 07:00 UT
      Ejecta      Start time: 2011/01/24 10:00 UT
      Ejecta      End   time: 2011/01/25 12:00 UT
      dv = 30 km/s, v = 350 km/s, vmax= 400 km/s
      MC index:     1
      Dst:        -14 nT
      Suggested source CME: none
      V_transit:  none
      
  1.2. Comments
      Overall ICME quality index: 3
      ICME signatures: Bmax: 5.2 nT
                       Bz rotation - smooth decrease until 2011/01/24 16:00 UT and then remains almost constant
      Others ICME signature: Tp < Texp 
      Behavior: short duration sheath - long duration ejecta

      Disturbance time 350 km/s  -> search window 5 days -> 2011/01/19 

2. CME
   2.1. A. Candidate A
    A.1. LASCO:    
      #CME 2011/01/19 18:00 UT, poor event - C2 (from CDAW)   



    A.2 .STEREO: 
           Also seen as a minor CME in COR2-A and COR2 B, First frame at COR2A: 2011/01/19 11:24 UT - slow event
           (COR2 data gap, starting at 19:23 UT)

    A.3. AIA & GOES
	   corresponding flare: B1.0 at 2011/01/19 08:47 UT (peak time)
	                        flare from AR11147 

       GOES: slow duration event 8:00 UT - 13:00 UT

    A.4 Comment:  
	   Likely the source: the eject is in the nothern hemisphere, which is consistent with the LASCO observations
	                       
  

   2.2. Comment
        Likely solar source is Candidate A 


3. Other Comments
      
        1: CDAW gives a partial halo CME on 2011/01/18 04:00 UT but it not earth directed, not supported by STEREO - backsided event

        2: CDAW gives a partial halo CME on 2011/01/21 13:25 UT but it moves towards the north, not the equatorial plane.  

4. Summary
    SW index 2
    Source index 3
    Overall index 3.