THE REVERSAL OF THE SUN'S MAGNETIC FIELD IN CYCLE 24статья

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Дата последнего поиска статьи во внешних источниках: 26 июня 2019 г.

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[1] The reversal of the sun's magnetic field in cycle 24 / A. V. Mordvinov, A. A. Pevtsov, L. Bertello, G. J. Petrie // Solar-Terrestrial Physics. — 2016. — Vol. 2, no. 1. — P. 3–18. Analysis of synoptic data from the Vector Spectromagnetograph (VSM) of the Synoptic Optical Long-term Investigations of the Sun (SOLIS) and the NASA/NSO Spectromagnetograph (SPM) at the NSO/Kitt Peak Vacuum Telescope facility shows that the reversals of solar polar magnetic fields exhibit elements of a stochastic process, which may include the development of specific patterns of emerging magnetic flux, and the asymmetry in activity between Northern and Southern hemispheres. The presence of such irregularities makes the modeling and prediction of polar field reversals extremely hard if possible. In a classical model of solar activity cycle, the unipolar magnetic regions (U MRs) of predominantly following polarity fields are transported polewards due to meridi onal flows and diffusion. The UMRs gradually cancel out the polar magnetic field of the previous cycle, and rebuild the pol ar field of opposite polarity setting the stage for the next cycle. We show, however, that th is deterministic picture can be ea sily altered by the developing of a strong center of activity, or by the emergence of an ext remely large active region, or by a ‘strategically placed’ coronal hole. We demonstrate that the acti vity occurring during the current cycle 24 may be the result of this randomness in the evolution of the solar surface magnetic field. [ DOI ]

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