Well you might see some common factors from the CME that hit the Magnetic Field in March of 2011
X-FLARE: March 9th, 2011 ended with a powerful solar flare. Earth-orbiting satellites detected an X1.5-class explosion from behemoth sunspot 1166 around 2323 UT. A movie from NASA’s Solar Dynamics Observatory shows a bright flash of UV radiation plus some material being hurled away from the blast site.
3/11/11
2011 March 11 05:46:24 UTC -Magnitude 9.0 - NEAR THE EAST COAST OF HONSHU, JAPAN
7/12/12
X-FLARE! Big sunspot AR1520 unleashed an X1.4-class solar flare on July 12th, 2012. Because the sunspot is directly facing Earth, everything about the blast was geoeffective. For one thing, it hurled a coronal mass ejection (CME) directly toward our planet. According to a forecast track prepared by analysts at the Goddard Space Weather Lab, the CME will hit Earth on July 14th around 09:17 UT (+/- 7 hours) and could spark strong geomagnetic storms.
Thank you.