| Autor: |
Martínez González, M. J., Manso Sainz, R., Asensio Ramos, A., Hijano, E. |
| Předmět: |
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| Zdroj: |
Astrophysical Journal; 8/20/2012, Vol. 755 Issue 2, p1-1, 1p |
| Abstrakt: |
We analyze two regions of the quiet Sun (35.6 × 35.6 Mm2) observed at high spatial resolution (≲100 km) in polarized light by the IMaX spectropolarimeter on board the SUNRISE balloon. We identify 497 small-scale (∼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 ∼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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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