Active region upflows: I. Multi-instrument observations

We study up-flows at the edges of active regions, called AR outflows, using multi-instrument observations. This study intends to provide the first direct observational evidence of whether chromospheric jets play an important role in furnishing mass that could sustain coronal upflows. The evolution o...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2015-12, Vol.584, p.A38
Main Authors: Vanninathan, K, Madjarska, M S, Galsgaard, K, Huang, Z, Doyle, J G
Format: Article
Language:English
Subjects:
Astronomy
Benchmarking
Coronas
Evolution
Jets
Magnetic fields
Spicules
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Summary:We study up-flows at the edges of active regions, called AR outflows, using multi-instrument observations. This study intends to provide the first direct observational evidence of whether chromospheric jets play an important role in furnishing mass that could sustain coronal upflows. The evolution of the photospheric magnetic field, associated with the foot-points of the up-flow region and the plasma properties of active region up-flows is investigated with the aim of providing information for benchmarking data-driven modeling of this solar feature. Our results suggest that at chromospheric heights there are no signatures that support the possible contribution of spicules to active region up-flows. We suggest that magnetic flux diffusion is responsible for the formation of the coronal up-flows. The existence of two velocity components possibly indicates the presence of two different flows, which are produced by two different physical mechanisms, e.g. magnetic reconnection and pressure-driven jets.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201526340