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SUMMARY:Solar-cycle variation of the quiet-sun magnetism
DTSTART;VALUE=DATE-TIME:20230511T102000Z
DTEND;VALUE=DATE-TIME:20230511T103500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115652Z
UID:indico-contribution-337@meetings.aip.de
DESCRIPTION:Speakers: Andreas Korpi-Lagg (Max Planck Institute for Solar S
 ystem Research / Aalto University)\nSolar dynamo models can explain the pr
 oduction and maintenence of the solar magnetic fields on two different spa
 tial scales: the large-scale solar dynamo\, manifested in the cycle-depend
 ent appearance of solar active regions\, and the small-scale solar dynamo\
 , driven by the turbulent convective motions close to the solar surface. D
 isentangling these two mechanisms observationally is extremely challenging
 \, but provides important input for the dynamo models. Highly stable long-
 term observations with sufficient magnetic sensitivity are required.\n\nTh
 e Helioseismic Imager on board the Solar Dynamics Observatory (SDO/HMI) ha
 s measured the solar magnetic field for more than one solar cycle. In ths 
 work\, we present the results of these 13-year long magnetic field measure
 ments in the most quiet patches of the solar surface after applying a comb
 ination of a temporal and spatial averaging algorithm and a careful select
 ion process. The results provide strong evidence for a solar-cycle modulat
 ion in even the most quiet patches when they include network fields. In co
 ntrast\, the modulation is absent in the internetwork fields\, where only 
 the interior of the supergranular cells is included in the analysis.\n\nWe
  interpret the absence of a solar-cycle modulation in the internetork fiel
 ds as a consequence of them being generated by the small-scale (or fluctua
 ting) dynamo acting on scales smaller than a supergranular cell. The solar
  cycle modulation when including the network fields can be explained by ta
 ngling of the solar-cycle dependent large-scale sub-surface field.\n\nhttp
 s://meetings.aip.de/event/24/contributions/337/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/24/contributions/337/
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