Gas dynamics in the impulsive phase of solar flares. II - The structure of the transition region - A diagnostic of energy transport processes

1985 ◽  
Vol 288 ◽  
pp. 779 ◽  
Author(s):  
A. G. Emslie ◽  
F. Nagai
Keyword(s):  
Transition Region ◽  
Solar Flares ◽  
Gas Dynamics ◽  
Energy Transport ◽  
Impulsive Phase ◽  
Transport Processes

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

Transition Region Downflows in the Impulsive Phase of Solar Flares

2005 ◽  
Vol 625 (2) ◽  
pp. 1027-1035 ◽  
Author(s):  
S. Kamio ◽  
H. Kurokawa ◽  
D. H. Brooks ◽  
R. Kitai ◽  
S. UeNo
Keyword(s):  
Transition Region ◽  
Solar Flares ◽  
Impulsive Phase

scholarly journals Spectroscopic Diagnostics of the UV Emitting Plasmas in Solar Flares Observed from SMM

1984 ◽  
Vol 86 ◽  
pp. 147-150 ◽  
Author(s):  
Chung-Chieh Cheng ◽  
E. Tandberg-Hanssen
Keyword(s):  
Transition Region ◽  
Solar Flares ◽  
Transport Processes ◽  
Spatial Correlations ◽  
Dynamic Changes ◽  
X Ray ◽  
Physical Conditions ◽  
Uv Emission ◽  
Temporal And Spatial ◽  
Ultraviolet Spectrometer

The transition region exhibits dynamic changes during solar flares. To understand the energy release and transport processes in solar flares, it is important to determine observationally the physical conditions in the flare transition region plasmas, which emit in the UV wavelength ranges. During the Solar Maximum Mission (SMM) we observed many flares in the UV emission lines of Si IV (1402 Å) and 0 IV (1401 Å) using the Ultraviolet Spectrometer and Polarimeter (Woodgate et al. 1983). In this paper we present the Si IV/O IV flare observations, in particular the dynamic evolution of the transition zone plasmas (~ 105 K). We also studied the temporal and spatial correlations between the impulsive UV and hard X-ray bursts.

scholarly journals Transition Region Emission and Energy Input to Thermal Plasma during the Impulsive Phase of Solar Flares

2007 ◽  
Vol 659 (1) ◽  
pp. 750-757 ◽  
Author(s):  
John C. Raymond ◽  
Gordon Holman ◽  
A. Ciaravella ◽  
A. Panasyuk ◽  
Y.‐K. Ko ◽  
...  
Keyword(s):  
Transition Region ◽  
Thermal Plasma ◽  
Solar Flares ◽  
Energy Input ◽  
Impulsive Phase

scholarly journals EUV irradiance observations from SDO/EVE as a diagnostic of solar flares

2015 ◽  
Vol 11 (S320) ◽  
pp. 41-50
Author(s):  
Ryan O. Milligan
Keyword(s):  
Solar Flares ◽  
Energy Transport ◽  
Spatial Information ◽  
Extreme Ultraviolet ◽  
Impulsive Phase ◽  
Spectral Irradiance ◽  
Transport Mechanisms ◽  
Solar Dynamics Observatory ◽  
Solar Dynamics ◽  
Lower Solar Atmosphere

AbstractFor the past six years, the EUV Variability Experiment (EVE) onboard the Solar Dynamics Observatory has been monitoring changes in the Sun's extreme ultraviolet output over a range of timescales. Its primary function is to provide measurements of the solar spectral irradiance that is responsible for driving fluctuations in Earth's ionosphere and thermosphere. However, despite its modest spectral resolution and lack of spatial information, the EVE spectral range contains many lines and continua that have become invaluable for diagnosing the response of the lower solar atmosphere itself to an injection of energy, particularly during a flare's impulsive phase. In addition, high temperature emission lines can also be used to track changes in temperature and density of flaring plasma in the corona. The high precision of EVE observations are therefore crucial in helping us understand particle acceleration and energy transport mechanisms during solar flares, as well as the origins of the Sun's most geoeffective emission.

scholarly journals Plasma heating in the initial phase of solar flares

2009 ◽  
Vol 5 (S264) ◽  
pp. 282-284
Author(s):  
P. Rudawy ◽  
M. Siarkowski ◽  
R. Falewicz
Keyword(s):  
Solar Flares ◽  
Energy Transport ◽  
Electron Beams ◽  
Plasma Heating ◽  
Impulsive Phase ◽  
Thermal Electron ◽  
Flare Loop ◽  
X Ray ◽  
Heating Source ◽  
Rise Phase

AbstractIn this paper we analyze soft and hard X-ray emission of the 2002 September 20 M1.8 GOES class solar flare observed by RHESSI and GOES satellites, where soft X-ray emission precedes the onset of the main bulk hard X-ray emission by ~5 min. This suggests that an additional heating mechanism may be at work at the early beginning of the flare. However RHESSI spectra indicate presence of the non-thermal electrons also before impulsive phase. So, we assumed that a dominant energy transport mechanism during rise phase of solar flares is electron beam-driven evaporation. We used non-thermal electron beams derived from RHESSI spectra as the heating source in a hydrodynamic model of the analyzed flare. We showed that energy delivered by non-thermal electron beams is sufficient to heat the flare loop to temperatures in which it emits soft X-ray closely following the GOES 1–8 Å light-curve.

scholarly journals Noise-Assisted Discord-Like Correlations in Light-Harvesting Photosynthetic Complexes

2021 ◽  
Vol 3 (2) ◽  
pp. 262-271
Author(s):  
Pablo Reséndiz-Vázquez ◽  
Ricardo Román-Ancheyta ◽  
Roberto León-Montiel
Keyword(s):  
Potential Role ◽  
Energy Transport ◽  
Light Harvesting ◽  
Quantum Correlations ◽  
Transport Processes ◽  
Quantum Evolution ◽  
Light Harvesting Complexes ◽  
Transport Efficiency ◽  
Photovoltaic Materials ◽  
Photosynthetic Complexes

Transport phenomena in photosynthetic systems have attracted a great deal of attention due to their potential role in devising novel photovoltaic materials. In particular, energy transport in light-harvesting complexes is considered quite efficient due to the balance between coherent quantum evolution and decoherence, a phenomenon coined Environment-Assisted Quantum Transport (ENAQT). Although this effect has been extensively studied, its behavior is typically described in terms of the decoherence’s strength, namely weak, moderate or strong. Here, we study the ENAQT in terms of quantum correlations that go beyond entanglement. Using a subsystem of the Fenna–Matthews–Olson complex, we find that discord-like correlations maximize when the subsystem’s transport efficiency increases, while the entanglement between sites vanishes. Our results suggest that quantum discord is a manifestation of the ENAQT and highlight the importance of beyond-entanglement correlations in photosynthetic energy transport processes.

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