Dark Halos around Active Regions: emission properties of the Dark Halo around NOAA 12706
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28.09.2023
Affiliation
INAF-OACN
Main category
Natural Sciences (Physics)
Abstract
We present the first characterization of the emission properties of a DH, the one around AR NOAA 12706, that includes chromospheric, Transition Region and coronal observations, by using IRIS spectra from full-disk mosaics and SDO/AIA filtergrams. We also analyze SDO/HMI magnetograms to study its average magnetic field properties. We find that the DH has an emission lower than the QS in all IRIS lines and in the cooler AIA wavebands. Our work also reveals that the DH shape has undergone a morphological transformation passing from the chromosphere to the corona. In addition, we found evidence that DHs and CHs exhibit different behaviors, suggesting they are distinct types of structures on the Sun.
Further information
Further reading
Language
English
DOI
Conference
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