THE REVERSAL OF THE SUN'S MAGNETIC FIELD IN CYCLE 24статья
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 26 июня 2019 г.
Аннотация: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.