Solar flare

effect of 6 September 2017. An analysis using Spherical Elementary

Current Systems.

J.J. Curto (1),

S. Marsal (1)

(1) Observatori

de l’Ebre, (OE) CSIC - Universitat Ramon Llull, Roquetes,



For the first time, we analyzed the temporal

evolution of an Sfe event, that of 6 September 2017, by using the

technique of Spherical Elementary Current Systems (SECS). Thus we were

able to follow the temporal evolution of the current system during the

Sfe lifetime. At the beginning, a sharp increase in current

intensities occurred driven by the hard X rays which at that moment

were dominant. Then, a slow decay followed the advent of soft X and

EUV rays. Sfe modeled current systems appear abnormally displaced in

longitude with respect to the subsolar point. During the whole event,

both vortices remain static and no significant shift was detected. A

clear prevalence of the northern hemisphere was observed although the

event occurred during the equinox.