NDLI: A Remarkable Recent Transition in the Solar Dynamo

Content Provider	Springer Nature Link
Author	Jager, C. Akasofu, S. I. Duhau, S. Livingston, W. C. Nieuwenhuijzen, H. Potgieter, M. S.
Copyright Year	2016
Abstract	We summarize the major aspects of the remarkable, fairly long lasting period ( $\sim 2005$ to $\sim 2010$ ) of low solar activity, that we will call the Transition. It is the transitional stage between the Grand Maximum of the 20th century and a forthcoming (most probably Regular) episode of solar activity. The various kinds of activity in the functioning of the equatorial components of the solar dynamo before and during the Transition are summarized. While the behavior of unipolar magnetic regions and their rest-latitudes already gave very early indications – mid 20th century – of the forthcoming Transition, more such indications became available around 1995 and the main part of it occurred between 2005 and 2010. Some of the inferences are discussed. We submit the hypothesis that the solar tachocline undergoes pulsations and we present some helioseismic evidences. In that scenario we find that its equatorial part has moved downward over a fairly small semi-amplitude ( $\sim 0.03$ solar radii) during the time of the Transition. There are several indications, apart from this ‘pulsation’, that the tachocline may even be pulsating with still smaller amplitudes in more modes. We speculate about the physical mechanism(s).
Starting Page	109
Ending Page	145
Page Count	37
File Format	PDF
ISSN	00386308
Journal	Space Science Reviews
Volume Number	201
Issue Number	1-4
e-ISSN	15729672
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-10-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Equatorial magnetic fields Polar magnetic fields Grand maximum Transition phase Solar dynamo Tachocline Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) Planetology Aerospace Technology and Astronautics Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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