Big Earth-facing coronal hole seen in early hours of June 28, 2013 by SDO's combined AIA and STAR active regions and coronal holes map (Credit: SDO)
An interplanetary shock wave hit our planet's geomagnetic field on June 27, 2013 at approximately 14:20 UTC. Geomagnetic Sudden Impulse was registered at 14:40 UTC. The impact was relatively weak and has not caused a geomagnetic storming so far. The a deviation in ground currents was detected by magnetometer located in Kiruna, Sweden, which is clear signal of the passage of an interplanetary shock past our planet.
Active geomagnetic levels with minor storm periods are possible in the next 24 hours as a consequence of the expected arrival of a new coronal hole high speed stream. The coronal hole high speed stream's geomagnetic effects will likely decrease on June 29, 2013 when quiet to active levels are expected.
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