Quiet Sun magnetic fields.
The quiet Sun is a highly turbulent plasma that exhibits a rich and complex magnetic structuring which is still not fully resolved nor understood. It has been shown recently that the magnetic flux of the quiet Sun is at least three orders of magnitude larger than the one of active regions. The amount of magnetic energy stored in quiet Sun magnetic structures is still unknown, but long standing questions on the physical origin of coronal heating and solar wind acceleration are probably related to magnetic mechanisms taking place in the quiet Sun.
In our group we use high resolution, high sensitivity spectropolarimetric observations from space (Hinode satellite) and ground (Themis telescope) to explore this essential aspect of the solar magnetism.