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Paper: Measurement of the Evolution of the Magnetic Field of the Quiet Photosphere over a Solar Cycle
Volume: 526, Solar Polarization Workshop 8
Page: 283
Authors: Ramelli, R.; Bianda, M.; Berdyugina, S. V.; Belluzzi, L.; Kleint, L.
Abstract: The solar photosphere is filled by magnetic fields tangled at scales much smaller than the resolution capability of solar telescopes. These hidden magnetic fields can be investigated via the Hanle effect. In 2007, we started a synoptic program to explore whether the magnetic flux of the quiet photosphere varies with the solar cycle. For this purpose we applied a differential Hanle effect technique based on observations of scattering polarization in C2 molecular lines around 514.0 nm, taken with a cadence of approximately one month. Our results now span almost one complete solar cycle.
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