期刊
ASTROPHYSICAL JOURNAL
卷 698, 期 1, 页码 75-82出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/698/1/75
关键词
Sun: magnetic fields; Sun: photosphere
资金
- NASA [NX08AJ06G]
- STFC Advanced Fellowship
- Phillip Leverhulme Prize
- Royal Society of Edinburgh 2008 Cormack Summer Scholarship
- NSF [ATM-0451438]
- Science and Technology Facilities Council [PP/E001122/1] Funding Source: researchfish
- STFC [PP/E001122/1] Funding Source: UKRI
Solar flares, coronal mass ejections, and indeed phenomena on all scales observed on the Sun, are inextricably linked with the Sun's magnetic field. The solar surface is covered with magnetic features observed on many spatial scales, which evolve on differing timescales: the largest features, sunspots, follow an 11-year cycle; the smallest seem to follow no cycle. Here, we analyze magnetograms from Solar and Heliospheric Observatory (SOHO)/Michelson Doppler Imager (full disk and high resolution) and Hinode/Solar Optical Telescope to determine the fluxes of all currently observable surface magnetic features. We show that by using a clumping algorithm, which counts a single flux massif as one feature, all feature fluxes, regardless of flux strength, follow the same distribution-a power law with slope -1.85 +/- 0.14-between 2 x 10(17) and 10(23) Mx. A power law suggests that the mechanisms creating surface magnetic features are scale-free. This implies that either all surface magnetic features are generated by the same mechanism, or that they are dominated by surface processes (such as fragmentation, coalescence, and cancellation) in a way which leads to a scale-free distribution.
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