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Statistical Analysis of Solar Events Associated with storm sudden commencements in the magnetosphere by K. Bocchialini et al.*

10 Jul 2018, 09:31 UTC
Statistical Analysis of Solar Events Associated with storm sudden commencements in the magnetosphere by K. Bocchialini et al.*
(200 words excerpt, click title or image to see full post)

We developed an innovative approach by studying each Earth-directed event leading to a storm sudden commencement (SSC) in the magnetosphere during 2002 (maximum activity of Cycle 23). This unprecedented, comprehensive study consists of: i) starting from the list of 32 SSCs listed by the International Service of Geomagnetic Indices (ISGI) of the Observatory de l’Ebre, ii) linking each SSC to a CME, iii) filling in the observational gaps along the Sun–Earth chain as much as possible, and iv) identifying one or many solar sources, with a clear signature on the Sun, in a temporal window determined by considering two extreme propagation velocities (300 and 1500 km s−1). When there is no CME identified as the source of the observed SSC, we seek what process in the solar wind may have led to the SSC, with the help of observations at L1. Regarding the terrestrial consequences, where previous studies are limited to just a few magnetic indices, we also study carefully the responses of the magnetosphere–ionosphere–thermosphere system making use of a large set of varied measurements (from spacecraft operating during 2002 along the Sun–Earth line and from terrestrial stations).
Main results
The 32 SSCs are linked to 31 perturbations observed at ...

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