The brightness of magnetic field concentrations in the quiet Sun
2011 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 532, A136- p.Article in journal (Refereed) Published
In addition to the facular brightening of active regions, the quiet Sun also contains a small scale magnetic field with associated brightenings in continuum radiation. We measure this contribution of quiet regions to the Sun's brightness from high spatial resolution (0 ''.16-0 ''.32) observations of the Swedish 1-m Solar Telescope (SST) and Hinode satellite. The line-of-sight magnetic field and continuum intensity near Fe I 6302.5 angstrom are used to quantify the correlation between field strength and brightness. The data show that magnetic flux density contains a significant amount of intrinsically weak fields that contribute little to brightness. We show that with data of high spatial resolution a calibration of magnetic flux density as a proxy for brightness excess is possible. In the SST data, the magnetic brightening of a quiet region with an average (unsigned) flux density of 10 G is about 0.15%. In the Hinode data, and in SST data reduced to Hinode resolution, the measured brightening is some 40% lower. With appropriate correction for resolution, magnetic flux density can be used as a reliable proxy in regions of small scale mixed polarity. The measured brightness effect is larger than the variation of irradiance over a solar cycle. It is not clear, however, if this quiet Sun contribution actually varies significantly.
Place, publisher, year, edition, pages
2011. Vol. 532, A136- p.
Sun: surface magnetism, Sun: photosphere, solar-terrestrial relations
IdentifiersURN: urn:nbn:se:su:diva-68289DOI: 10.1051/0004-6361/201015976ISI: 000293942700035OAI: oai:DiVA.org:su-68289DiVA: diva2:477979
authorCount :22012-01-152012-01-032012-01-15Bibliographically approved