A possible mechanism governing the production and evolution of Ellerman bombs

Solar Physics ◽  
1996 ◽  
Vol 168 (1) ◽  
pp. 105-114 ◽  
Author(s):  
Declan A. Diver ◽  
John C. Brown ◽  
David M. Rust
Keyword(s):  
Ellerman Bombs

scholarly journals Spectropolarimetric Observation of an Emerging Flux Region: Triggering Mechanisms of Ellerman Bombs

2008 ◽  
Vol 684 (1) ◽  
pp. 736-746 ◽  
Author(s):  
H. Watanabe ◽  
R. Kitai ◽  
K. Okamoto ◽  
K. Nishida ◽  
J. Kiyohara ◽  
...  
Keyword(s):  
Triggering Mechanisms ◽  
Ellerman Bombs

A search for polarization in Ellerman bombs

Solar Physics ◽  
1992 ◽  
Vol 140 (1) ◽  
pp. 55-65 ◽  
Author(s):  
David M. Rust ◽  
Steven L. Keil
Keyword(s):  
Ellerman Bombs

scholarly journals Ellerman bombs and UV bursts: transient events in chromospheric current sheets

2019 ◽  
Vol 626 ◽  
pp. A33 ◽  
Author(s):  
V. Hansteen ◽  
A. Ortiz ◽  
V. Archontis ◽  
M. Carlsson ◽  
T. M. D. Pereira ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Current Sheet ◽  
Model Atmosphere ◽  
Opposite Polarity ◽  
Flux Emergence ◽  
Physical Relationship ◽  
Synthetic Spectra ◽  
Outer Atmosphere ◽  
Cool Gas ◽  
Ellerman Bombs

Context. Ellerman bombs (EBs), observed in the photospheric wings of the Hα line, and UV bursts, observed in the transition region Si IV line, are both brightenings related to flux emergence regions and specifically to magnetic flux of opposite polarity that meet in the photosphere. These two reconnection-related phenomena, nominally formed far apart, occasionally occur in the same location and at the same time, thus challenging our understanding of reconnection and heating of the lower solar atmosphere. Aims. We consider the formation of an active region, including long fibrils and hot and dense coronal plasma. The emergence of a untwisted magnetic flux sheet, injected 2.5 Mm below the photosphere, is studied as it pierces the photosphere and interacts with the preexisting ambient field. Specifically, we aim to study whether EBs and UV bursts are generated as a result of such flux emergence and examine their physical relationship. Methods. The Bifrost radiative magnetohydrodynamics code was used to model flux emerging into a model atmosphere that contained a fairly strong ambient field, constraining the emerging field to a limited volume wherein multiple reconnection events occur as the field breaks through the photosphere and expands into the outer atmosphere. Synthetic spectra of the different reconnection events were computed using the 1.5D RH code and the fully 3D MULTI3D code. Results. The formation of UV bursts and EBs at intensities and with line profiles that are highly reminiscent of observed spectra are understood to be a result of the reconnection of emerging flux with itself in a long-lasting current sheet that extends over several scale heights through the chromosphere. Synthetic spectra in the Hα and Si IV 139.376 nm lines both show characteristics that are typical of the observations. These synthetic diagnostics suggest that there are no compelling reasons to assume that UV bursts occur in the photosphere. Instead, EBs and UV bursts are occasionally formed at opposite ends of a long current sheet that resides in an extended bubble of cool gas.

scholarly journals Chromospheric explosions and satellite sunspots

1968 ◽  
Vol 35 ◽  
pp. 77-84 ◽  
Author(s):  
David M. Rust
Keyword(s):  
Magnetic Fields ◽  
Energy Release ◽  
Magnetic Energy ◽  
Longitudinal Component ◽  
Large Spot ◽  
Polarity Reversals ◽  
Almost Continuous ◽  
Ellerman Bombs

Observations of the longitudinal component of the photospheric magnetic fields near sunspots imply that surges and Ellerman bombs occur at neutral points in the magnetic fields (i.e. |B|=0) in the chromosphere. The neutral points appear above satellite sunspots, which are defined as polarity reversals (in B||) near the edges of large-spot penumbrae. A series of magnetograph observations shows a point of satellite polarity vanishing during a period of almost continuous surge activity. The lost magnetic energy is comparable to the energy release evidenced by the surge.

scholarly journals Internal Fine Structure of Ellerman Bombs

2010 ◽  
Vol 62 (4) ◽  
pp. 879-891 ◽  
Author(s):  
Yuki Hashimoto ◽  
Reizaburo Kitai ◽  
Kiyoshi Ichimoto ◽  
Satoru UeNo ◽  
Shin’ichi Nagata ◽  
...  
Keyword(s):  
Fine Structure ◽  
Ellerman Bombs

scholarly journals FINE-SCALE PHOTOSPHERIC CONNECTIONS OF ELLERMAN BOMBS

2016 ◽  
Vol 829 (2) ◽  
pp. 100 ◽  
Author(s):  
Heesu Yang ◽  
Jongchul Chae ◽  
Eun-Kyung Lim ◽  
Donguk Song ◽  
Kyuhyoun Cho ◽  
...  
Keyword(s):  
Fine Scale ◽  
Ellerman Bombs

Observations of Ellerman bombs in H ?

Solar Physics ◽  
1987 ◽  
Vol 108 (2) ◽  
pp. 227-236 ◽  
Author(s):  
Th.G. Zachariadis ◽  
C.E. Alissandrakis ◽  
G. Banos
Keyword(s):  
Ellerman Bombs

scholarly journals Spectro-Polarimetric Observations and Non-Lte Modeling of Ellerman Bombs

Solar Physics ◽  
2006 ◽  
Vol 235 (1-2) ◽  
pp. 75-86 ◽  
Author(s):  
Hector Socas-Navarro ◽  
Valentín Martínez Pillet ◽  
David Elmore ◽  
Anna Pietarila ◽  
Bruce W. Lites ◽  
...  
Keyword(s):  
Ellerman Bombs

A spectropolarimetric study of Ellerman bombs

2002 ◽  
Vol 46 (11) ◽  
pp. 918-924 ◽  
Author(s):  
L. K. Kashapova
Keyword(s):  
Ellerman Bombs

scholarly journals On the structure and dynamics of Ellerman bombs

2013 ◽  
Vol 557 ◽  
pp. A102 ◽  
Author(s):  
N. Bello González ◽  
S. Danilovic ◽  
F. Kneer
Keyword(s):  
Structure And Dynamics ◽  
Ellerman Bombs
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