Free access article

A&A 411, 615-621 (2003)
DOI: 10.1051/0004-6361:20031560

Research Note

Inter-Network magnetic fields observed during the minimum of the solar cycle

J. Sánchez Almeida

Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain
(Received 26 June 2003 / Accepted 29 September 2003)

Abstract
We analyze a time series of high angular resolution magnetograms of quiet Sun Inter-Network (IN) magnetic fields. These magnetograms have a spatial resolution better than 0 5, a noise of some 20 G, and they have been obtained at the disk center during the minimum of the solar cycle. The IN regions show a typical unsigned flux density of the order of 15 G. Signals occur, preferentially, in the intergranular lanes, and the strongest signals trace a network with a scale similar to the mesogranulation. All these features are consistent with the IN magnetograms by Dominguez Cerdena et al. (2003a,b), obtained during the maximum of the solar cycle. Consequently, the unsigned magnetic flux of the structures that give rise to the IN polarization signals does not seem to undergo large variations during the solar cycle.

Key words: Sun: granulation -- Sun: magnetic fields -- Sun: photosphere

© ESO 2003

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