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The brightness of magnetic field concentrations in the quiet Sun
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- Schnerr, R. S. (author)
- Stockholms universitet,Institutionen för astronomi
- Spruit, H. C. (author)
- (creator_code:org_t)
- 2011-08-05
- 2011
- English.
- In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 532, s. A136-
- Journal article (peer-reviewed)
Abstract
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- 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.
Keyword
- Sun: surface magnetism
- Sun: photosphere
- solar-terrestrial relations
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- ref (subject category)
- art (subject category)
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