G1 geomagnetic storm in progress (July 15, 2013)


A minor geomagnetic storm is currently in progress due to slow-moving CME that erupted on July 9, 2013 and swept past Earth on July 13, 2013. The Bz component of the interplanetary magnetic field (IMF) tipped sharply south late on July 14, 2013 (-10 nT). Geomagnetic activity reached minor storm levels (Kp=5) early on July 15, 2013. NOAA/SWPC issued G1 (Minor) Geomagnetic Storm Level Alert. At this level weak power grid fluctuations can occur, with minor impact on satellite operations. Aurora is commonly visible at high latitudes (northern Michigan and Maine).

Estimated planetary K-index show Kp=5 values early on July 15, 2013 (Credit: NOAA/SWPC)

SolarHam reports the increase in geomagnetic activity also opened up the 6 meter (50 Mhz) amateur radio band with a flurry of aurora signals in both the United Kingdom, Scandinavia and northern parts of the United States and Canada. 

Global D-Region Absortion map (Credit: NOAA/SWPC)

A minor CME hit Earth's magnetic field on July 9, 2013 at approximately 20:30 UTC and peaked during the early hours of July 10, 2013 and again on July 11, 2013, both times peaking at Kp=5. G1 geomagnetic storm produced auroras in northern US states from Wisconsin to Washington.

Planetary K-index values from July 9 to July 15, 2013 (Credit: NOAA/SWPC)

Featured image: Aurora forecast map – North Pole (Credit: NOAA/OVATION)


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