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

E. E. Benevolenskaya

doi:10.1051/0004-6361:200400092

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Volume 428 / No 1 (December II 2004)

A&A, 428 1 (2004) L5-L8

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Issue		A&A Volume 428, Number 1, December II 2004


Page(s)		L5 - L8
Section		Letters
DOI		https://doi.org/10.1051/0004-6361:200400092
Published online		23 November 2004

A&A 428, L5-L8 (2004)

Letter to the Editor

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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