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Extreme solar-terrestrial events

  • A. Dal Lago (a1), L. E. Antunes Vieira (a1), E. Echer (a1), L. A. Balmaceda (a2), M. Rockenbach (a1) and W. D. Gonzalez (a1)...

Abstract

Extreme solar-terrestrial events are those in which very energetic solar ejections hit the earth?s magnetosphere, causing intense energization of the earth?s ring current. Statistically, their occurrence is approximately once per Gleissberg solar cycle (70-100yrs). The solar transient occurred on July, 23rd (2012) was potentially one of such extreme events. The associated coronal mass ejection (CME), however, was not ejected towards the earth. Instead, it hit the STEREO A spacecraft, located 120 degrees away from the Sun-Earth line. Estimates of the geoeffectiveness of such a CME point to a scenario of extreme Space Weather conditions. In terms of the ring current energization, as measured by the Disturbance Storm-Time index (Dst), had this CME hit the Earth, it would have caused the strongest geomagnetic storm in space era.

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References

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Keywords

Extreme solar-terrestrial events

  • A. Dal Lago (a1), L. E. Antunes Vieira (a1), E. Echer (a1), L. A. Balmaceda (a2), M. Rockenbach (a1) and W. D. Gonzalez (a1)...

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