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Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 35, 799-804, 2017
https://doi.org/10.5194/angeo-35-799-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Regular paper
13 Jul 2017
Automatic detection of Sfe: a proposal
Juan José Curto, Santiago Marsal, Gastón Creci, and Gemma Domingo Observatori de l'Ebre, (OE), CSIC, Universitat Ramon Llull, 43520 Roquetes, Spain
Abstract. Solar flare effects (Sfe's) are rapid magnetic variations related to the enhancement of the amount of radiation produced during solar flare events. For several minutes, the ionosphere is activated and electron densities, electrical conductivities and electric currents are enhanced. The magnetic signature of a flare is visible in the illuminated hemisphere, and sometimes it shows up as small crochet-like movements in the magnetograms. However, regarding their detection using an automatized procedure, they have been very elusive because their small amplitude, which is close to the level of noise produced by other natural phenomena, and their highly variable irregular shapes make it extremely difficult to apply predesigned patterns. In this paper, we summarize the difficulties that Sfe detection presents and explain a line of work we initiated to overcome these difficulties with the goal of achieving a system capable of performing automatic detection. Some properties of Sfe's, including spherical symmetry around the vortex and different time durations between Sfe's and other natural variations, were used to construct an index allowing us to detect Sfe's.

Citation: Curto, J. J., Marsal, S., Creci, G., and Domingo, G.: Automatic detection of Sfe: a proposal, Ann. Geophys., 35, 799-804, https://doi.org/10.5194/angeo-35-799-2017, 2017.
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In this paper, we summarize the difficulties that Sfe detection presents and explain a line of work we initiated to overcome these difficulties with the goal of achieving a system capable of performing automatic detection. Some properties of Sfe, including spherical symmetry around the vortex and different time durations between Sfe and other natural variations, were used to construct an index allowing us to detect Sfe.
In this paper, we summarize the difficulties that Sfe detection presents and explain a line of...
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