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Extreme solar-terrestrial events

Published online by Cambridge University Press:  12 September 2017

A. Dal Lago ,
L. E. Antunes Vieira ,
E. Echer ,
L. A. Balmaceda ,
M. Rockenbach  and
W. D. Gonzalez
A. Dal Lago
Affiliation:
National Institute for Space Research (INPE), Avenida dos Astronautas-12227-010, São José dos Campos-SP, Brazil email: alisson.dallago@inpe.br
L. E. Antunes Vieira
Affiliation:
National Institute for Space Research (INPE), Avenida dos Astronautas-12227-010, São José dos Campos-SP, Brazil email: alisson.dallago@inpe.br
E. Echer
Affiliation:
National Institute for Space Research (INPE), Avenida dos Astronautas-12227-010, São José dos Campos-SP, Brazil email: alisson.dallago@inpe.br
L. A. Balmaceda
Affiliation:
Instituto de Ciencias Astronómicas de la Tierra y el Espacio, ICATE-CONICET, Avda. de España Sur 1512, J5402DSP, San Juan, Argentina
M. Rockenbach
Affiliation:
National Institute for Space Research (INPE), Avenida dos Astronautas-12227-010, São José dos Campos-SP, Brazil email: alisson.dallago@inpe.br
W. D. Gonzalez
Affiliation:
National Institute for Space Research (INPE), Avenida dos Astronautas-12227-010, São José dos Campos-SP, Brazil email: alisson.dallago@inpe.br
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Abstract

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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.

Keywords

geomagnetic stormssolar-terrestrial events
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 233 - 236
Copyright
Copyright © International Astronomical Union 2017 

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