科研之友
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摘要
We analyze two regions of the quiet Sun (35.6 x 35.6 Mm(2)) observed at high spatial resolution (less than or similar to 100 km) in polarized light by the IMaX spectropolarimeter on board the SUNRISE balloon. We identify 497 small-scale (similar to 400 km) magnetic loops, appearing at an effective rate of 0.25 loop h(-1) arcsec(-2); further, we argue that this number and rate are underestimated by similar to 30%. However, we find that these small dipoles do not appear uniformly on the solar surface: their spatial distribution is rather filamentary and clumpy, creating dead calm areas, characterized by a very low magnetic signal and a lack of organized loop-like structures at the detection level of our instruments, which cannot be explained as just statistical fluctuations of a Poisson spatial process. We argue that this is an intrinsic characteristic of the mechanism that generates the magnetic fields in the very quiet Sun. The spatio-temporal coherences and the clumpy structure of the phenomenon suggest a recurrent, intermittent mechanism for the generation of magnetic fields in the quietest areas of the Sun.
- 出版日期2012-8-20
