Jie Format:
Note on tracking Sun-Earth connection event

ICME Event: 2009/12/12

Observer: Taylor Cox on 2018/11/27

1. ICME
  1.1. Catalog
     # Identified in ICME catalogs: Richardson & Cain List
      RC catalog
      Disturbance start time: 2009/12/12 06:51 UT
      Ejecta      Start time: 2009/12/12 20:00 UT
      Ejecta      End   time: 2009/12/13 22:00 UT
      dv = 30 km/s, v = 270 km/s, vmax= 300 km/s
      MC index:     1
      Dst:        -2 nT
      Suggested source CME: 2009/12/06 02:20 UT W
      V_transit:  280 km/s

  1.2. Comments
      Overall ICME quality index: #
      ICME signatures: Bmax:  6.5 nT
                       Bz rotation
      Others ICME signature: 
      Peculiar behavior: density and temperature data is lost within the ejecta

      Disturbance time 400 km/s  -> search window 149 hrs -> 2009/12/05 18:00 UT

2. CME
   2.1.A.  Candidate A
    A.1. LASCO:
      #CME 2009/12/06 07:00 UT
	   minimal signatures.

     A.2. STEREO:
	    Simultaneous outflows from stereo A and B not labeled. They appear to agree in direction and time, and occur at an appropriate time in a proper direction to correspond to the ICME.

     A.3. AIA & GOES:
	    

     A.4. Comments:
             The lack of halo observation in LASCO is concerning if this were to correspond to the ICME.
   2.1.B. Candidate B.
     B.1. LASCO:
      #CME 2009/12/05
	There are many events over the course of the day that appear to possibly be significant in having a chance to be a partial halo CME.

     B.2. STEREO:
	   STEREO data on this day reveals events in many different directions, and though both A and B show events heading towards the Earth, the events seem to occur at significantly different times and in some cases different directions as well. 

     B.3. AIA & GOES:
	    

     B.4. Comments:
             the large amount of variety in activity on this day leads me to think that it is less likely for the event to have occurred on this day, as there is no instance of STEREO A and B agreeing on any of the events as heading towards Earth at the same time.
 
   2.2 Decided Source
       The most likely solar source is Candidate A.

3. Other Comments



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