Aurora Over New Zealand . ... The storm was triggered by a solar coronal mass ejection associated with the giant sunspot group cataloged as active region number 9393 . ... On April 2, the largest solar flare of the last 25 years also erupted near active region 9393, but because of its position near the Sun's edge the effects were largely directed away from our fair planet . ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ... A service of: LHEA at NASA / GSFC . ...