SOLAR ACTIVITY UPDATE: Geomagnetic Storm Watch (September 9th, 2011).

GEOMAGNETIC STORM WATCH: A series of coronal mass ejections (CMEs) propelled toward Earth by the recent eruptions of sunspot 1283 will deliver glancing blows to Earth’s magnetic field on Sept. 9th – 11th. High-latitude sky watchers should be alert for auroras in the nights ahead.
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