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  Observations of solar chromospheric heating at sub-arcsec spatial resolution

Smitha, H. N., Chitta, L. P., Wiegelmann, T., & Solanki, S. K. (2018). Observations of solar chromospheric heating at sub-arcsec spatial resolution. Astronomy and Astrophysics, 617: A128. doi:10.1051/0004-6361/201833276.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-6953-B Version Permalink: http://hdl.handle.net/21.11116/0000-0004-B083-0
Genre: Journal Article

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 Creators:
Smitha, H. N.1, Author              
Chitta, L. P.1, Author              
Wiegelmann, Thomas1, Author              
Solanki, Sami K.1, 2, Author              
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              
2ERC Advanced Grant: Solar magnetic field and its influence on solar variability and activity (SOLMAG), Max Planck Institute for Solar System Research, Max Planck Society, ou_3164813              

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Free keywords: Sun: atmosphere / Sun: magnetic fields / Sun: photosphere / Sun: chromosphere / magnetic reconnection
 MPIS_PROJECTS: SUNRISE
 Abstract: A wide variety of phenomena such as gentle but persistent brightening, dynamic slender features (∼100 km), and compact (∼1″) ultraviolet (UV) bursts are associated with the heating of the solar chromosphere. High spatio-temporal resolution is required to capture the finer details of the likely magnetic reconnection-driven, rapidly evolving bursts. Such observations are also needed to reveal their similarities to large-scale flares, which are also thought to be reconnection driven, and more generally their role in chromospheric heating. Here we report observations of chromospheric heating in the form of a UV burst obtained with the balloon-borne observatory SUNRISE. The observed burst displayed a spatial morphology similar to that of a large-scale solar flare with a circular ribbon. While the co-temporal UV observations at 1.5″ spatial resolution and 24 s cadence from the Solar Dynamics Observatory showed a compact brightening, the SUNRISE observations at diffraction-limited spatial resolution of 0.1″ at 7 s cadence revealed a dynamic substructure of the burst that it is composed of an extended ribbon-like feature and a rapidly evolving arcade of thin (∼0.1″) magnetic loop-like features, similar to post-flare loops. Such a dynamic substructure reveals the small-scale nature of chromospheric heating in these bursts. Furthermore, based on magnetic field extrapolations, this heating event is associated with a complex fan-spine magnetic topology. Our observations strongly hint at a unified picture of magnetic heating in the solar atmosphere from some large-scale flares to small-scale bursts, all associated with such a magnetic topology.

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Language(s): eng - English
 Dates: 2018-10-302018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1051/0004-6361/201833276
 Degree: -

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Project name : ERC-2015-AdG - SOLMAG
Grant ID : 695075
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Berlin : Springer-Verlag
Pages: - Volume / Issue: 617 Sequence Number: A128 Start / End Page: - Identifier: ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1