scholarly journals The development of lower-atmosphere turbulence early in a solar flare

2018 ◽  
Vol 4 (12) ◽  
pp. eaav2794 ◽  
Author(s):  
N. L. S. Jeffrey ◽  
L. Fletcher ◽  
N. Labrosse ◽  
P. J. A. Simões
Keyword(s):  
Solar Flare ◽  
Solar Atmosphere ◽  
Lower Atmosphere ◽  
Current View ◽  
Line Broadening ◽  
Atmosphere Turbulence ◽  
Spectral Line Broadening ◽  
Imaging Spectrograph ◽  
Lower Solar Atmosphere ◽  
Flare Model

We present the first observational study of the onset and evolution of solar flare turbulence in the lower solar atmosphere on an unprecedented time scale of 1.7 s using the Interface Region Imaging Spectrograph observing plasma at a temperature of 80,000 K. At this time resolution, nonthermal spectral line broadening, indicating turbulent velocity fluctuations, precedes the flare onset at this temperature and is coincident with net blue-shifts. The broadening decreases as the flare brightens and then oscillates with a period of ~10 s. These observations are consistent with turbulence in the lower solar atmosphere at the flare onset, heating that region as it dissipates. This challenges the current view of energy release and transport in the standard solar flare model, suggesting that turbulence partly heats the lower atmosphere.

scholarly journals Electric Conductivity of Lower Solar Atmosphere

1993 ◽  
Vol 141 ◽  
pp. 465-468 ◽  
Author(s):  
Jingxiu Wang
Keyword(s):  
Electric Conductivity ◽  
Solar Atmosphere ◽  
Conductivity Tensor ◽  
Lower Atmosphere ◽  
Temperature Minimum ◽  
Atmospheric Models ◽  
Minimum Value ◽  
Minimum Zone ◽  
Lower Solar Atmosphere ◽  
Lower Chromosphere

AbstractElectric conductivity tensor of partly-ionized plasma is deduced. Four atmospheric models are used then to estimate the conductivity in the lower atmosphere. The parallel conductivity reaches its minimum value in the temperature minimum zone, which is 1 to 2 orders smaller than the conductivity of fully-ionized plasmas of the same condition; the effective perpendicular conductivity, or Cowling conductivity, becomes 5 to 6 orders smaller than the fully-ionized value in the lower chromosphere.

Application of path integral formalism in spectral line broadening: Lyman- in hydrogenic plasma

2005 ◽  
Vol 94 (3-4) ◽  
pp. 335-346 ◽  
Author(s):  
H. Bouguettaia ◽  
Is. Chihi ◽  
K. Chenini ◽  
M.T. Meftah ◽  
F. Khelfaoui ◽  
...  
Keyword(s):  
Spectral Line ◽  
Path Integral ◽  
Line Broadening ◽  
Integral Formalism ◽  
Path Integral Formalism ◽  
Spectral Line Broadening

The Characteristics of Thin Magnetic Flux Tubes in the Lower Solar Atmosphere Observed byHinode/SOT in the G band and in Ca ii H Bright Points

2017 ◽  
Vol 851 (1) ◽  
pp. 42 ◽  
Author(s):  
Jianping Xiong ◽  
Yunfei Yang ◽  
Chunlan Jin ◽  
Kaifan Ji ◽  
Song Feng ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Solar Atmosphere ◽  
Flux Tubes ◽  
Magnetic Flux Tubes ◽  
Lower Solar Atmosphere

Estimation of the Energy Flux of Torsional Alfvén Waves in the Lower Solar Atmosphere Based on Measurements of the Doppler Velocities

2021 ◽  
Vol 61 (7) ◽  
pp. 1035-1037
Author(s):  
Yu. T. Tsap ◽  
A. V. Stepanov ◽  
Yu. G. Kopylova ◽  
O. V. Khaneychuk ◽  
T. B. Goldvarg
Keyword(s):  
Solar Atmosphere ◽  
Energy Flux ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Lower Solar Atmosphere

scholarly journals Magnetic reconnection resulting from flux emergence: implications for jet formation in the lower solar atmosphere?

2011 ◽  
Vol 535 ◽  
pp. A95 ◽  
Author(s):  
J. Y. Ding ◽  
M. S. Madjarska ◽  
J. G. Doyle ◽  
Q. M. Lu ◽  
K. Vanninathan ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
Solar Atmosphere ◽  
Flux Emergence ◽  
Jet Formation ◽  
Lower Solar Atmosphere

scholarly journals Study of the Dynamics of Convective Turbulence in the Solar Granulation by Spectral Line Broadening and Asymmetry

2020 ◽  
Vol 890 (2) ◽  
pp. 138 ◽  
Author(s):  
Ryohtaroh T. Ishikawa ◽  
Yukio Katsukawa ◽  
Takayoshi Oba ◽  
Motoki Nakata ◽  
Kenichi Nagaoka ◽  
...  
Keyword(s):  
Spectral Line ◽  
Line Broadening ◽  
Solar Granulation ◽  
Convective Turbulence ◽  
Spectral Line Broadening
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