Slow Moving Transient Led to Brief G2 Levels on 4 May

G2 (Moderate) geomagnetic storm conditions were briefly reached later on 4 May. This was due to a slow moving, but favorably oriented transient feature - a weak coronal mass ejection (CME). The transient arrived with a southward directed magnetic field and this allowed for favorable connection with Earth's magnetic field - kind of like putting two opposite magnets together. This favorable orientation led to a quick, but brief escalation to to G1-G2 levels late on 4 May (EDT).