Bombs and flares at the surface and lower atmosphere of the Sun

V. H. Hansteen; V. Archontis; T. M. D. Pereira; M. Carlsson; L. Rouppe van der Voort; J. Leenaarts

doi:10.3847/1538-4357/aa6844

Bombs and flares at the surface and lower atmosphere of the Sun

V. H. Hansteen, V. Archontis, T. M. D. Pereira, M. Carlsson, L. Rouppe van der Voort, J. Leenaarts

Research output: Contribution to journal › Article › peer-review

Abstract

A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Hα line, known as Ellerman bombs (EBs). Recent observations obtained by the Interface Region Imaging Spectrograph have revealed another type of plasma "bombs" (UV bursts) with high temperatures of perhaps up to 8 × 10⁴ K within the cooler lower solar atmosphere. Realistic numerical modeling showing such events is needed to explain their nature. Here, we report on 3D radiative magnetohydrodynamic simulations of magnetic flux emergence in the solar atmosphere. We find that ubiquitous reconnection between emerging bipolar magnetic fields can trigger EBs in the photosphere, UV bursts in the mid/low chromosphere and small (nano-/micro-) flares (10⁶ K) in the upper chromosphere. These results provide new insights into the emergence and build up of the coronal magnetic field and the dynamics and heating of the solar surface and lower atmosphere.

Original language	English
Article number	22
Number of pages	12
Journal	Astrophysical Journal
Volume	839
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aa6844
Publication status	Published - 10 Apr 2017

Keywords

Sun: activity
Sun: atmosphere
Sun: chromosphere
Sun: magnetic fields
Sun: photosphere
Sun: UV radiation

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Archontis_2017_AJ_BombsandFlares_FinalPubVersion
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Vasileios Archontis
- va11st-andrews.acuk
- School of Mathematics and Statistics - Honorary Lecturer
Person: Honorary

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title = "Bombs and flares at the surface and lower atmosphere of the Sun",

abstract = "A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Hα line, known as Ellerman bombs (EBs). Recent observations obtained by the Interface Region Imaging Spectrograph have revealed another type of plasma {"}bombs{"} (UV bursts) with high temperatures of perhaps up to 8 × 104 K within the cooler lower solar atmosphere. Realistic numerical modeling showing such events is needed to explain their nature. Here, we report on 3D radiative magnetohydrodynamic simulations of magnetic flux emergence in the solar atmosphere. We find that ubiquitous reconnection between emerging bipolar magnetic fields can trigger EBs in the photosphere, UV bursts in the mid/low chromosphere and small (nano-/micro-) flares (106 K) in the upper chromosphere. These results provide new insights into the emergence and build up of the coronal magnetic field and the dynamics and heating of the solar surface and lower atmosphere.",

keywords = "Sun: activity, Sun: atmosphere, Sun: chromosphere, Sun: magnetic fields, Sun: photosphere, Sun: UV radiation",

author = "Hansteen, {V. H.} and V. Archontis and Pereira, {T. M. D.} and M. Carlsson and {Rouppe van der Voort}, L. and J. Leenaarts",

note = "This research was supported by the Research Council of Norway and by the European Research Council under the European Union's Seventh Framework Programme (FP7/2007–2013)/ERC Grant agreement no. 291058.",

year = "2017",

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doi = "10.3847/1538-4357/aa6844",

language = "English",

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TY - JOUR

T1 - Bombs and flares at the surface and lower atmosphere of the Sun

AU - Hansteen, V. H.

AU - Archontis, V.

AU - Pereira, T. M. D.

AU - Carlsson, M.

AU - Rouppe van der Voort, L.

AU - Leenaarts, J.

N1 - This research was supported by the Research Council of Norway and by the European Research Council under the European Union's Seventh Framework Programme (FP7/2007–2013)/ERC Grant agreement no. 291058.

PY - 2017/4/10

Y1 - 2017/4/10

N2 - A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Hα line, known as Ellerman bombs (EBs). Recent observations obtained by the Interface Region Imaging Spectrograph have revealed another type of plasma "bombs" (UV bursts) with high temperatures of perhaps up to 8 × 104 K within the cooler lower solar atmosphere. Realistic numerical modeling showing such events is needed to explain their nature. Here, we report on 3D radiative magnetohydrodynamic simulations of magnetic flux emergence in the solar atmosphere. We find that ubiquitous reconnection between emerging bipolar magnetic fields can trigger EBs in the photosphere, UV bursts in the mid/low chromosphere and small (nano-/micro-) flares (106 K) in the upper chromosphere. These results provide new insights into the emergence and build up of the coronal magnetic field and the dynamics and heating of the solar surface and lower atmosphere.

AB - A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Hα line, known as Ellerman bombs (EBs). Recent observations obtained by the Interface Region Imaging Spectrograph have revealed another type of plasma "bombs" (UV bursts) with high temperatures of perhaps up to 8 × 104 K within the cooler lower solar atmosphere. Realistic numerical modeling showing such events is needed to explain their nature. Here, we report on 3D radiative magnetohydrodynamic simulations of magnetic flux emergence in the solar atmosphere. We find that ubiquitous reconnection between emerging bipolar magnetic fields can trigger EBs in the photosphere, UV bursts in the mid/low chromosphere and small (nano-/micro-) flares (106 K) in the upper chromosphere. These results provide new insights into the emergence and build up of the coronal magnetic field and the dynamics and heating of the solar surface and lower atmosphere.

KW - Sun: activity

KW - Sun: atmosphere

KW - Sun: chromosphere

KW - Sun: magnetic fields

KW - Sun: photosphere

KW - Sun: UV radiation

U2 - 10.3847/1538-4357/aa6844

DO - 10.3847/1538-4357/aa6844

M3 - Article

SN - 0004-637X

VL - 839

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 22

ER -

Bombs and flares at the surface and lower atmosphere of the Sun

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