scholarly journals Enhanced Turbulence and Heating Observed Preceding the Impulsive Phase in a Solar Flare

1989 ◽  
Vol 104 (2) ◽  
pp. 231-234
Author(s):  
Chung-Chieh Cheng ◽  
K.G. Widing
Keyword(s):  
Solar Flare ◽  
Transition Region ◽  
Normal Incidence ◽  
Impulsive Phase ◽  
Energetic Particles ◽  
Line Profiles ◽  
Chromospheric Evaporation

AbstractWe studied the unique EUV spectra of the 21 Jan. 1974 flare observed by the NRL Normal-Incidence Slit Spectrometer (SO 82B) onboard the Skylab. The results show that the pre-impulsive transition region plasmas exhibited enhanced turbulence and heating before the acceleration of energetic particles. The absence of blue-shifted components in the Fe XXI line profiles shows that the chromospheric evaporation is not important in this flare.

scholarly journals Chromospheric Downflows as a Diagnostic of Solar Flare Heating

1989 ◽  
Vol 104 (2) ◽  
pp. 203-206
Author(s):  
Dominic M. Zarro ◽  
Richard C. Canfield
Keyword(s):  
Solar Flare ◽  
Energy Flux ◽  
Solar Flares ◽  
Impulsive Phase ◽  
X Ray ◽  
Doppler Shifts ◽  
Chromospheric Evaporation ◽  
Good Agreement

AbstractUsing coordinated X-ray and Hα observations of five solar flares, we investigate the dynamics of chromospheric condensations formed during chromospheric evaporation. We show that the peak downflow velocity of condensations predicted by simple hydrodynamic compression of the chromosphere is in good agreement with empirical downflow velocities implied by impulsive phase Hα redwing Doppler shifts. This agreement indicates that the Hα wing redshift provides a useful diagnostic of the pressure excess in the evaporating region and, hence, the energy flux driving chromospheric evaporation.

scholarly journals Observational Evidence of Gentle Chromospheric Evaporation during the Impulsive Phase of a Solar Flare

2006 ◽  
Vol 642 (2) ◽  
pp. L169-L171 ◽  
Author(s):  
Ryan O. Milligan ◽  
Peter T. Gallagher ◽  
Mihalis Mathioudakis ◽  
Francis P. Keenan
Keyword(s):  
Solar Flare ◽  
Impulsive Phase ◽  
Observational Evidence ◽  
Chromospheric Evaporation

Effects of Ambipolar Diffusion on Prominence Thread Models

1994 ◽  
Vol 144 ◽  
pp. 315-321 ◽  
Author(s):  
M. G. Rovira ◽  
J. M. Fontenla ◽  
J.-C. Vial ◽  
P. Gouttebroze
Keyword(s):  
Energy Balance ◽  
Transition Region ◽  
Ambipolar Diffusion ◽  
Line Profiles ◽  
Balance Equations ◽  
Model Calculations ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution ◽  
Theoretical Structure

AbstractWe have improved previous model calculations of the prominence-corona transition region including the effect of the ambipolar diffusion in the statistical equilibrium and energy balance equations. We show its influence on the different parameters that characterize the resulting prominence theoretical structure. We take into account the effect of the partial frequency redistribution (PRD) in the line profiles and total intensities calculations.

scholarly journals IMAGING AND SPECTROSCOPIC OBSERVATIONS OF MAGNETIC RECONNECTION AND CHROMOSPHERIC EVAPORATION IN A SOLAR FLARE

2014 ◽  
Vol 797 (2) ◽  
pp. L14 ◽  
Author(s):  
Hui Tian ◽  
Gang Li ◽  
Katharine K. Reeves ◽  
John C. Raymond ◽  
Fan Guo ◽  
...  
Keyword(s):  
Solar Flare ◽  
Magnetic Reconnection ◽  
Spectroscopic Observations ◽  
Chromospheric Evaporation

scholarly journals TRANSITION REGION EMISSION FROM SOLAR FLARES DURING THE IMPULSIVE PHASE

2011 ◽  
Vol 735 (2) ◽  
pp. 70 ◽  
Author(s):  
H. Johnson ◽  
J. C. Raymond ◽  
N. A. Murphy ◽  
S. Giordano ◽  
Y.-K. Ko ◽  
...  
Keyword(s):  
Transition Region ◽  
Solar Flares ◽  
Impulsive Phase

Conduction-driven chromospheric evaporation in a solar flare

1988 ◽  
Vol 329 ◽  
pp. 456 ◽  
Author(s):  
Dominic M. Zarro ◽  
James R. Lemen
Keyword(s):  
Solar Flare ◽  
Chromospheric Evaporation
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