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Impact of small-scale emerging flux from the photosphere to the corona: a case study from IRIS

Published online by Cambridge University Press:  24 September 2020

Salvo L. Guglielmino Open the ORCID record for Salvo L. Guglielmino [Opens in a new window] ,
Peter R. Young ,
Francesca Zuccarello ,
Paolo Romano  and
Mariarita Murabito
Salvo L. Guglielmino
Affiliation:
Dipartimento di Fisica e Astronomia “Ettore Majorana” – Sezione Astrofisica, Università degli Studi di Catania, Via S. Sofia 78, 95123, Catania, Italy email: [email protected]
Peter R. Young
Affiliation:
Code 671, NASA Goddard Space Flight Center, Greenbelt, MD20771, USA College of Science, George Mason University, Fairfax, VA22030, USA Northumbria University, Newcastle upon Tyne, NE1 8ST, United Kingdom
Francesca Zuccarello
Affiliation:
Dipartimento di Fisica e Astronomia “Ettore Majorana” – Sezione Astrofisica, Università degli Studi di Catania, Via S. Sofia 78, 95123, Catania, Italy email: [email protected]
Paolo Romano
Affiliation:
INAF – Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy
Mariarita Murabito
Affiliation:
INAF – Osservatorio Astronomico di Roma, via Frascati 33, I-00078 Monte Porzio Catone, Italy
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Abstract

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We report on multi-wavelength ultraviolet (UV) high-resolution observations taken with the IRIS satellite during the emergence phase of an emerging flux region embedded in the unipolar plage of active region NOAA 12529. These data are complemented by measurements taken with the spectropolarimeter aboard the Hinode satellite and by observations from SDO.

In the photosphere, we observe the appearance of opposite emerging polarities, separating from each other, and cancellation with a pre-existing flux concentration of the plage.

In the upper atmospheric layers, recurrent brightenings resembling UV bursts, with counterparts in all UV/EUV filtergrams, are identified in the EFR site. In addition, plasma ejections are observed at chromospheric level. Most important, we unravel a signature of plasma heated up to 1 MK detecting Fe XII emission in the core of the brightening sites.

Comparing these findings with previous observations and numerical models, we suggest evidence of several long-lasting, small-scale magnetic reconnection episodes between the new bipolar EFR and the ambient field.

Keywords

Sun: magnetic fieldsSun: photosphereSun: chromosphereSun: transition regionSun: coronaSun: UV radiation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 439 - 442
Copyright
© International Astronomical Union 2020

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