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| Titel |
Evolution of the Fine Structure of Magnetic Fields in the Quiet Sun: Observations from Sunrise/IMaX and Extrapolations |
| VerfasserIn |
Thomas Wiegelmann, Sami Solanki, Juan Borrero, Hardi Peter, The Sunrise Team |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250076523
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| Zusammenfassung |
| Observations with the balloon-borne Sunrise/ Imaging Magnetograph eXperiment (IMaX)
provide high spatial resolution (roughly 100 km at disk center) measurements of the magnetic
field in the photosphere of the quiet Sun. To investigate the magnetic structure of the
chromosphere and corona, we extrapolate these photospheric measurements into the upper
solar atmosphere and analyse a 22-minute long time series with a cadence of 33
seconds. Using the extrapolated magnetic-field lines as tracer, we investigate temporal
evolution of the magnetic connectivity in the quiet Sun’s atmosphere. The majority of
magnetic loops are asymmetric in the sense that the photospheric field strength
at the loop footpoints is very different. We find that the magnetic connectivity of
the loops changes rapidly with a typical connection recycling time of about 3 ± 1
minutes in the upper solar atmosphere and 12 ± 4 minutes in the photosphere. This
is considerably shorter than previously found. Nonetheless, our estimate of the
energy released by the associated magnetic-reconnection processes is not likely
to be the sole source for heating the chromosphere and corona in the quiet Sun. |
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