The size distribution of magnetic bright points derived from Hinode-SOT observations - Astrophysics > Solar and Stellar AstrophysicsReportar como inadecuado




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Abstract: Context. Magnetic Bright Points MBPs are small-scale magnetic features inthe solar photosphere. They may be a possible source of coronal heating byrapid footpoint motions that cause magnetohydrodynamical waves. The number andsize distribution are of vital importance in estimating the smallscale-magnetic-field energy. Aims. The size distribution of MBPs is derived forG-band images acquired by the Hinode-SOT instrument. Methods. Foridentification purposes, a new automated segmentation and identificationalgorithm was developed. Results. For a sampling of 0.108 arcsec-pixel, wederived a mean diameter of 218 +- 48 km for the MBPs. For the full resolveddata set with a sampling of 0.054 arcsec-pixel, the size distribution shiftedto a mean diameter of 166 +- 31 km. The determined diameters are consistentwith earlier published values. The shift is most probably due to the differentspatial sampling. Conclusions. We conclude that the smallest magnetic elementsin the solar photosphere cannot yet be resolved by G-band observations. Theinfluence of discretisation effects sampling has also not yet beeninvestigated sufficiently.



Autor: D. Utz, A. Hanslmeier, C. Möstl, R. Muller, A. Veronig, H. Muthsam

Fuente: https://arxiv.org/







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