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Astrophysics Research Centre

School of Mathematics and Physics

Solar cycle variation of the internetwork magnetic structuring

  • Submitted by: Marianne Faurobert, University of Nice-Sophia Antipolis
  • Authors: M. Faurobert & G. Ricort
  • Session: Monday afternoon posters.

The magnetic structuring of solar internetwork fields is still poorly understood. However remarkable progress has been made thanks to the SOT telescope onboard Hinode.

Here we analyze center-to-limb polarization measurements obtained with the SOT/SP spectropolarimeter outside active regions in 2007 and 2013, i.e. at a minimum and a maximum of the solar cycle, respectively. We examine 10"x10" maps of the unsigned circular and linear polarization in the FeI 630.25 nm line in regions located away from network elements. The maps are corrected for bias and focus variations between the two data sets. Then we apply a Fourier spectral analysis to examine wether the spatial structuring of the internetwork magnetic fields shows significant differences between the minimum and maximum of the cycle.

For the unsigned circular polarization the power of the fluctuations is smaller in 2013 than in 2007 but the spectral slope is unchanged. The linear polarization fluctuation power spectra show no significant differences in 2013 and 2007 however they are strongly affected by noise.The small scale magnetic structuring in the internetwork is different in our 2013 and 2007 data. Surprisingly we find smaller spatial fluctuation power at the solar maximum. This points to some complex interactions between the small scale magnetic structures in the quiet Sun and the global dynamo. This result has to be confirmed by further statistical studies with larger data sets.

Click here to download pdf of the eposter

public/hinode9/schedule/session-02p/v0010.txt · Last modified: 2015/09/25 14:25 by Mihalis Mathioudakis

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