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Issue A&A
Volume 428, Number 1, December II 2004
Page(s) L5 - L8
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200400092



A&A 428, L5-L8 (2004)
DOI: 10.1051/0004-6361:200400092

Letter

Polar magnetic flux on the Sun in 1996-2003 from SOHO/MDI data

E. E. Benevolenskaya1, 2

1  Stanford University, Stanford, USA
    e-mail: EBenevolenskaya@solar.stanford.edu
2  Pulkovo Astronomical Observatory, St. Petersburg, Russia

(Received 13 September 2004 / Accepted 12 October 2004)

Abstract
Polarity of the polar magnetic fields on the Sun changes in every 11-year sunspot cycle, affecting the large-scale structure of the corona and heliosphere. Using the SOHO/MDI data, the flux of the radial component of the magnetic field is estimated for different latitudinal zones. It is estimated that the total magnetic flux of the Northern polar zone, from $78^{\circ}$ to $88^{\circ}$, is about $1.5{-}1.7 \times 10^{22}$ Mx, and it is about $2.3{-}2.5\times 10^{22}$ Mx in the similar Southern polar zone. The new data reveal an interesting result that the total polar magnetic fluxes do not vary significantly during the polar magnetic field reversals in both hemispheres, while the positive and negative parts of the total fluxes do change.


Key words: Sun -- solar magnetic field -- polar magnetic field reversals -- magnetic flux




© ESO 2004

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