TY  - JOUR
A1  - Kontogiannis, Ioannis
A1  - Dineva, Ekaterina Ivanova
A1  - Diercke, Andrea
A1  - Verma, Meetu
A1  - Kuckein, Christoph
A1  - Balthasar, Horst
A1  - Denker, Carsten
T1  - High-resolution spectroscopy of an erupting minifilament and its impact on the nearby chromosphere
JF  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - We study the evolution of a minifilament eruption in a quiet region at the center of the solar disk and its impact on the ambient atmosphere. We used high spectral resolution imaging spectroscopy in H alpha acquired by the echelle spectrograph of the Vacuum Tower Telescope, Tenerife, Spain; photospheric magnetic field observations from the Helioseismic Magnetic Imager; and UV/EUV imaging from the Atmospheric Imaging Assembly of the Solar Dynamics Observatory. The H alpha line profiles were noise-stripped using principal component analysis and then inverted to produce physical and cloud model parameter maps. The minifilament formed between small-scale, opposite-polarity magnetic features through a series of small reconnection events, and it erupted within an hour after its appearance in H alpha. Its development and eruption exhibited similarities to large-scale erupting filaments, indicating the action of common mechanisms. Its eruption took place in two phases, namely, a slow rise and a fast expansion, and it produced a coronal dimming, before the minifilament disappeared. During its eruption, we detected a complicated velocity pattern, indicative of a twisted, thread-like structure. Part of its material returned to the chromosphere, producing observable effects on nearby low-lying magnetic structures. Cloud model analysis showed that the minifilament was initially similar to other chromospheric fine structures, in terms of optical depth, source function, and Doppler width, but it resembled a large-scale filament on its course to eruption. High spectral resolution observations of the chromosphere can provide a wealth of information regarding the dynamics and properties of minifilaments and their interactions with the surrounding atmosphere.
KW  - the sun
KW  - solar chromosphere
KW  - active solar chromosphere
KW  - active solar
KW  - corona
KW  - solar filament eruptions
KW  - high resolution spectroscopy
Y1  - 2020
U6  - https://doi.org/10.3847/1538-4357/aba117
SN  - 0004-637X
SN  - 1538-4357
VL  - 898
IS  - 2
PB  - Institute of Physics Publ.
CY  - London
ER  -