03/17/2015 04:00:00 UTC

Comment Section

• varSITI campaign event
• The largest geomagnetic storm at Earth for this solar cycle, this event registered a Dst peak below -200. Based on both the in-situ signature of the event and the ENLIL solar wind prediction for this date, I think it is likely a CIR played a role in making it so strong. Also based on the C2 and C3 images for the day, it appears there is a slow CME launching around noon on the 14th with a small but visible filament. On the morning of the 15th a partial halo CME, associated with a long duration flare that fell just short of M class and from the same active region, launched propagating to the East of the Sun Earth line. I think it is likely that an interaction between the CME+shock of this event and the previous blob CME, as well as the added energy from the CIR and fast speed stream behind the CME likely caused the severity of the geomagnetic activity at the Earth (Hess)

Image Data

In-situ data

GOES Plot

Video Data

AIA 171 movie
AIA 193 movie
AIA 304 movie
AIA 1600 movie
HMI movie
C2 movie
C3 movie