Results 81 to 90 of about 1,455,996 (195)

Origin of Small-scale Evaporation Flows Deep in the Chromosphere During a Solar Flare

The Astrophysical Journal Letters
Flares are caused by an abrupt release of magnetic energy in the solar atmosphere. Plasma heated to well over 10 MK filling the postflare corona originates from a rapid heating and ablation of the cooler chromospheric material.
L. P. Chitta, H. N. Smitha, Francisco A. Iglesias, Tino L. Riethmüller, Alex Feller, Wei Chen, Andreas Lagg, Achim Gandorfer, Johannes Hölken, Sami K. Solanki, Jose Carlos del Toro Iniesta, Yukio Katsukawa, Pietro Bernasconi, Thomas Berkefeld, Alberto Álvarez-Herrero, Masahito Kubo, David Orozco Suárez, Bianca Grauf, Michael Carpenter, Alexander Bell, Valentín Martínez Pillet, Francisco Javier Bailén, Julián Blanco Rodríguez, Juan Sebastián Castellanos Durán, Edvarda Harnes, Ryohtaroh T. Ishikawa, Yusuke Kawabata, Takuma Matsumoto, Takayoshi Oba, Azaymi L. Siu-Tapia, Hanna Strecker, Dušan Vukadinovic   +31 more
doaj   +1 more source

Evidence for Plasmoid-mediated Magnetic Reconnection during a Small-scale Flare in the Partially Ionized Low Solar Atmosphere

The Astrophysical Journal Letters
Magnetic reconnection plays a crucial role in the energy release process for different kinds of solar eruptions and activities. The rapid solar eruption requires a fast reconnection model. Plasmoid instability in the reconnecting current sheets is one of
Guanchong Cheng, Lei Ni, Zehao Tang, Yajie Chen, Yuhao Chen, Jialiang Hu, Jun Lin   +6 more
doaj   +1 more source

Machine Learning–based Separation of the He I 10830 Å Chromospheric Signal: Quantitative Analysis of Chromosphere–Corona Intensity in the Quiet Sun

The Astrophysical Journal Supplement Series
The He I 10830 Å line, a crucial optically thin chromospheric line, is frequently used to study coronal heating and vertical coupling across the chromosphere–corona interface.
Huaiming Li, Fangyu Xu, Yi Bi, Zhenyu Jin   +3 more
doaj   +1 more source

Observational Analysis of Multithermal Counterstreaming Flows in a Forming Filament and Their Relationship with Local Heating at Filament Footpoints

The Astrophysical Journal
Utilizing high-resolution imaging and spectroscopic observations from the New Vacuum Solar Telescope, the Interface Region Imaging Spectrograph, and the Solar Dynamics Observatory, we investigated the nature and origin of counterstreaming flows within a ...
Hongrui Li, Hechao Chen, Chun Xia, Xiaoli Yan, Yongyuan Xiang, Jincheng Wang   +5 more
doaj   +1 more source

Designing photovolaic/thermal solar collectors for building integration [PDF]

, 2008
With concern growing over the environment and resource use, there has been greater emphasis placed on sustainability, particularly in the built environment.
Carson, James K., Duke, Mike, Anderson, Timothy Nicholas   +2 more
core  

A Self-consistent Mechanism for Heating the Solar Magnetic Atmosphere by Kinetic Alfvén Waves

The Astrophysical Journal
Coronal heating remains a long-standing problem in solar and astrophysical plasmas. Alfvén waves (AWs) can carry sufficient energy into the solar atmosphere, but how this energy is dissipated into particle heating is not well understood.
L. Xiang, L. Chen, C. Fang, D. J. Wu, H. Q. Feng, G. Q. Zhao, Q. H. Li   +6 more
doaj   +1 more source

Reduction of the Downward Energy Flux of Nonthermal Electrons in the Solar Flare Corona due to Cospatial Return-current Losses

The Astrophysical Journal
High-energy electrons carry much of a solar flare’s energy. Therefore, understanding changes in electron beam distributions during their propagation is crucial. A key focus of this paper is how the cospatial return current reduces the energy flux carried
Meriem Alaoui, Gordon D. Holman, M. Swisdak   +2 more
doaj   +1 more source

Forward modeling solar spectra onto Doppler images of λ And

Astronomy & Astrophysics
Context. Due to their high chromospheric activity and photometric variability, RS CVn-type binaries are ideal laboratories for studying stellar surface structures and the corresponding stellar activity relations.
Adebali Ö., Pietrow A. G. M.
doaj   +1 more source

Heating of Solar and Stellar Chromospheres and Coronae by MHD Waves [PDF]

Highlights of Astronomy, 1992
Ground-based and satellite observations have shown that all late-type dwarfs possess hot outer envelopes, and that the chromospheric and coronal emissions observed from these envelopes vary significantly for a given, fixed spectral type. In addition, there is growing evidence for nonhomogeneous and locally strong magnetic fields in the atmospheres of ...
openaire   +1 more source

Electron and proton heating by solar wind turbulence [PDF]

, 2009
Previous formulations of heating and transport associated with strong magnetohydrodynamic (MHD) turbulence are generalized to incorporate separate internal energy equations for electrons and protons. Electron heat conduction is included.
Matthaeus, William H., Cranmer, S.R., Oughton, Sean, S. R. Cranmer, S. Oughton, J. C. Kasper, W. H. Matthaeus, Kasper, J.C., B. Breech, Breech, Ben   +9 more
core   +1 more source