Polar cap magnetic field reversals during solar grand minima: could pores play a role?

0461427 - ASÚ 2017 RIV FR eng J - Článek v odborném periodiku
Švanda, Michal - Brun, A.S. - Roudier, T. - Jouve, L.
Polar cap magnetic field reversals during solar grand minima: could pores play a role?
Astronomy & Astrophysics. Roč. 586, February (2016), A123/1-A123/11. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA ČR(CZ) GA14-04338S
Institucionální podpora: RVO:67985815
Klíčová slova: dynamo * Sun * magnetic fields
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.014, rok: 2016

We study the magnetic flux carried by pores located outside active regions with sunspots and investigate their possible contribution to the reversal of the global magnetic field of the Sun. We find that they contain a total flux of comparable amplitude to the total magnetic flux contained in polar caps. The pores located at distances of 40-100 Mm from the closest active region systematically have the correct polarity of the magnetic field to contribute to the polar cap reversal. These pores can be found predominantly in bipolar magnetic regions. We propose that during grand minima of solar activity, such a systematic polarity trend, which is akin to a weak magnetic (Babcock-Leighton-like) source term, could still be operating but was missed by the contemporary observers because of the limited resolving power of their telescopes.
Trvalý link: http://hdl.handle.net/11104/0261021