Advances in Astronomy and Space Physics, Volume 6, Issue 1, PP. 20-23 (2016)
doi: 10.17721/2227-1481.6.20-23
Estimation of the flux tube diameters outside sunspots
using Hinode observations. Preliminary results
using Hinode observations. Preliminary results
1Astronomical Observatory, Taras Shevchenko National University of Kyiv, Observatorna str., 3, Kyiv, 04053, Ukraine
2Jodrell Bank Centre for Astrophysics, University of Manchester, Alan Turing building, Manchester M13 9PL, UK
2Jodrell Bank Centre for Astrophysics, University of Manchester, Alan Turing building, Manchester M13 9PL, UK
Abstract
Indirect estimations of diameters of the smallest flux tubes outside sunspots are made using SOT/Hinode observations of FeI 6301.5 and 6302.5 lines. These estimations are based on the comparison of measured effective magnetic field strength Beff in named lines. It is shown that Beff(6301.5)/Beff(6302.5)≈1.3 in the range Beff=40-300 G, and Beff(6301.5)/Beff(6302.5)≈1.0$ for Beff≤10-20 G. The first case corresponds to the two-component magnetic field with kG flux tubes and weak background field, whereas the second one corresponds to background field without flux tubes. Assuming that the field range Beff=10-40 G corresponds to the case with only one flux tube in each pixel, the flux tube diameters should be 15-30 km. Possible influence of the brightness contrast and the Zeeman saturation could change this estimation by approximately 20%.
Keywords:
Sun: magnetic fields, photosphere