Baker, D;
Stangalini, M;
Valori, G;
Brooks, DH;
To, ASH;
Van Driel-Gesztelyi, L;
Demoulin, P;
... Jafarzadeh, S; + view all
(2021)
Alfvénic Perturbations in a Sunspot Chromosphere Linked to Fractionated Plasma in the Corona.
The Astrophysical Journal
, 907
(1)
, Article 16. 10.3847/1538-4357/abcafd.
Preview |
Text
Baker_2021_ApJ_907_16.pdf - Published Version Download (1MB) | Preview |
Abstract
In this study, we investigate the spatial distribution of highly varying plasma composition around one of the largest sunspots of solar cycle 24. Observations of the photosphere, chromosphere, and corona are brought together with magnetic field modeling of the sunspot in order to probe the conditions that regulate the degree of plasma fractionation within loop populations of differing connectivities. We find that, in the coronal magnetic field above the sunspot umbra, the plasma has photospheric composition. Coronal loops rooted in the penumbra contain fractionated plasma, with the highest levels observed in the loops that connect within the active region. Tracing field lines from regions of fractionated plasma in the corona to locations of Alfvénic fluctuations detected in the chromosphere shows that they are magnetically linked. These results indicate a connection between sunspot chromospheric activity and observable changes in coronal plasma composition.
| Type: | Article |
|---|---|
| Title: | Alfvénic Perturbations in a Sunspot Chromosphere Linked to Fractionated Plasma in the Corona |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/abcafd |
| Publisher version: | https://doi.org/10.3847/1538-4357/abcafd |
| 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: | Sunspots; Magnetic fields; Solar active region magnetic fields; Solar chromosphere; Solar corona |
| 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/10120146 |
Archive Staff Only
 |
View Item |
