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Bombs and Flares at the Surface and Lower Atmosphere of the Sun
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Number of Authors: 6
2017 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 839, no 1, 22Article in journal (Refereed) Published
Abstract [en]

A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Ha 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 x 10(4) 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 (10(6) 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.

Place, publisher, year, edition, pages
2017. Vol. 839, no 1, 22
Keyword [en]
Sun: activity, Sun: atmosphere, Sun: chromosphere, Sun: magnetic fields, Sun: photosphere, Sun: UV radiation
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-143596DOI: 10.3847/1538-4357/aa6844ISI: 000399251000007OAI: oai:DiVA.org:su-143596DiVA: diva2:1104043
Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2017-05-31Bibliographically approved

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Leenaarts, Jorrit
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