Note on tracking Sun-Earth connection event

ICME Event: 2012/02/26

Observer: Jie Zhang on 2018/11/26

1. ICME
  1.1. Catalog
     #  Richardson & Cane catelog
      Disturbance start time: 2012/02/14 07:00 UT
      Ejecta      Start time: 2012/02/14 21:00 UT
      Ejecta      End   time: 2012/02/16 06:00 UT
      dv = 40 km/s, v = 370 km/s, vmax= 400 km/s
      MC index:     1
      Dst:        -67 nT
      Suggested source CME: No
      V_transit:  N/A
      
  1.2. SW plots
      Overall ICME quality index: 2
      SW type: disturbance + ejecta
      ICME signatures: long Bs of 9 nT, but maximum B is only 9 nT 
      Others ICME signature: not obvious
      Peculiar behavior: 

      Search window:
      Upper bound: Disturbance speed 400 km/s: 104 hrs: > 2012/02/09 23 UT
      Lower bound: Transit speed < 700 km/s:  : 60 hrs  < 2012/02/11 19 uT.   

2. CME   
   2.1, A, Candidate A
     A.1. LASCO  
       #CME 2012/02/09 21:17 UT, full halo (from CDAW)
           speed =  659 km/s
	   large angle CME, mosly toward the west. 

     A.2. STEREO
       #COR2 A/B:
            strong halo CME
	    front side
         
     A.3. AIA & GOES
          #GOES: no flare in the window, 
     	# AIA: a huge filament erupting from close to the limb, but on the front side; the longitude is about 70 deg 
	  
	  
     A.4. Comment
          unlikely the source. Too close to the limb


  2.1.B. Candidate B
      B.1. LASCO
        #CME 2012/02/10 20:00 UT, full halo CME (from CDAW)
	    speed = 533 km/s
	    
      B.2. STEREO
       
      B.3. AIA and GOES
        #GOES: no flare in the window
	 #AIA:large filament eruption on the front disk. East footpoint E39N4, west footpint E02N37
	 
      B.4. Comment
        likely the candidate

  2.1.C Candidate C
     C.1. LASCO
          non-halo CME in CDAW catalog
	  faint, but appears to be a broad partial halo CME at 13:36 UT through inspection

     C.2. STEREO
          COR2 A/B: narrow CME, but front side
	  COR2 A/B: narrow CME with a central PA along the equatorial plan 
	  
     C.3. AIA/GOES
          AIA 304: no apparent dimming on the disk during the search window

     C.4 Comment:
         Not likely to be the source. Not a halo CME. No signautre on the disk

   2.2. Comment
        Candiate B is the likely source


3. Other Comments


4. Summary
    SW index: 2
    Source index: 1
    Overall index:.2