Dacie, S;
van Driel-Gesztelyi, L;
Demoulin, P;
Linton, MG;
Leake, JE;
MacTaggart, D;
Cheung, MCM;
(2017)
Field distribution of magnetograms from simulations of active region formation.
Astronomy and Astrophysics
, 606
, Article A34. 10.1051/0004-6361/201730767.
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Abstract
CONTEXT: The evolution of the photospheric magnetic field distributions (probability densities) was derived for a set of active regions in Dacie et al. (2016). Photospheric field distributions are a consequence of physical processes that are difficult to pin-point only from observations. AIMS: In this study, we analyse simulated magnetograms from numerical simulations, which model the emergence and the decay of active regions. These simulations have different experimental set-ups and include different physical processes, allowing us to investigate the relative importance of convection, magnetic buoyancy, magnetic twist and braiding for flux emergence. METHODS: We look specifically at the photospheric field distributions (probability densities found using kernel density estimation analysis) and compare the results with those found from observations. RESULTS: Simulations including convection most accurately reproduce the observed evolution of the photospheric field distributions during active region evolution. CONCLUSIONS: This indicates that convection may play an important role during the decay phase and also during the formation of active regions, particularly for low flux density values.
| Type: | Article |
|---|---|
| Title: | Field distribution of magnetograms from simulations of active region formation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/201730767 |
| Publisher version: | http://dx.doi.org/10.1051/0004-6361/201730767 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, magnetic fields, magnetohydrodynamics (MHD), Sun: photosphere, sunspots, methods: statistical methods: numerical, FLUX EMERGENCE, TUBE |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10037836 |
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