segunda-feira, 1 de outubro de 2012

Tempestade Solar - Secondary CME Impact / G3 Storm

The ACE Spacecraft detected a secondary solar wind increase at 22:13 UTC Sunday evening. The Boulder, Colorado magnetometer detected a sudden geomagnetic impulse with a deviation of 35nT at 23:07 UTC. This signals the passage of an interplanetary shock past our planet. The Bz component of the interplanetary magnetic field (IMF) is tipped sharply south and this could intensify geomagnetic activity. A Strong G3 Level Geomagnetic Storm resulted at high latitudes. Visible Aurora is being reported across many locations in the Northern USA and Canada. Minor to Moderate Geomagnetic Storming may persist for several more hours.

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2012 Oct 01 0300 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2012 Sep 30 2307 UTC
Deviation: 35 nT
Station: Boulder

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