Bombs and Flares at the Surface and Lower Atmosphere of the Sun

被引：95

作者：

Hansteen, V. H. ^{[1
]}

Archontis, V. ^{[2
]}

Pereira, T. M. D. ^{[1
]}

Carlsson, M. ^{[1
]}

van der Voort, L. Rouppe ^{[1
,3
]}

Leenaarts, J.

机构：

[1] Univ Oslo Norway, Inst Theoret Astrophys, PB 1029 Blindern, NO-0315 Oslo, Norway

[2] St Andrews Univ, Sch Math & Stat, St Andrews KY16 9SS, Fife, Scotland

[3] Stockholm Univ, Inst Solar Phys, Dept Astron, Roslagstullbacken 21, SE-10691 Stockholm, Sweden

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 839卷 / 01期

基金：

欧洲研究理事会;

关键词：

Sun: activity; Sun: atmosphere; Sun: chromosphere; Sun: magnetic fields; Sun: photosphere; Sun: UV radiation; MULTILEVEL RADIATIVE-TRANSFER; ELLERMAN BOMBS; MG II; MAGNETIC RECONNECTION; SOLAR; IRIS; I; REDISTRIBUTION; SIMULATIONS; ULTRAVIOLET;

D O I：

10.3847/1538-4357/aa6844

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：12

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