As the strongest Solar Radiation Storm (S3) since May, 2005 continues, the associated Earthward-directed Coronal Mass Ejection is expected to arrive about 1400 UT (9am EST) Jan 24. SWPC has issued a Geomagnetic Storm Watch with G2 level storming likely and G3 level storming possible, with the storm continuing into Wednesday, Jan 25. All of this activity is related to a moderate (R2) Radio Blackout x-ray flare that erupted Sunday night (11pm EST).
Geomagnetic Storm Photo of the Sun