Results 81 to 90 of about 881 (218)

Solar Vortex Tubes. III. Vorticity and Energy Transport

The Astrophysical Journal
This study investigated the mechanisms of vorticity generation and the role of vortex tubes in plasma heating and energy transport. Vortex tubes were identified using the instantaneous vorticity deviation technique in the MURaM data set of a simulated ...
Suzana S. A. Silva, Gary Verth, Istvan Ballai, Erico L. Rempel, Sergiy Shelyag, Luiz A. C. A. Schiavo, Tiago F. P. Gomes, Viktor Fedun   +7 more
doaj   +1 more source

Solar Spectroscopy and (Pseudo-)Diagnostics of the Solar Chromosphere

, 2010
I first review trends in current solar spectrometry and then concentrate on comparing various spectroscopic diagnostics of the solar chromosphere. Some are actually not at all chromospheric but just photospheric or clapotispheric and do not convey ...
Raveendran, A.S.N., Chaudhuri, R.K., Astrophysics, Robert J. Rutten, Rutten, R.J., Dep Natuurkunde, Mekkaden, A.V.   +6 more
core   +1 more source

Height-dependent Slow Magnetoacoustic Wave Amplitude and Energy Flux in Sunspot Atmospheres

The Astrophysical Journal
Slow magnetoacoustic waves (SMAWs) have been considered a possible candidate for chromospheric heating in the past. This study analyzed 20 active regions observed between 2012 and 2016 to examine the amplitude and energy flux variation of SMAWs in the ...
Y. Sanjay, S. Krishna Prasad, P. S. Rawat   +2 more
doaj   +1 more source

A static model of chromospheric heating in solar flares

The Astrophysical Journal, 1983
The response of the solar chromosphere to flare processes, namely nonthermal electrons, thermal conduction, and coronal pressure, is modeled. Finite difference methods employing linearization and iteration are used in obtaining simultaneous solutions to the equations of steady-state energy balance, hydrostatic equilibrium, radiative transfer, and ...
P. J. Ricchiazzi, R. C. Canfield
openaire   +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

Influence of the Lower Atmosphere on Wave Heating and Evaporation in Solar Coronal Loops

The Astrophysical Journal Letters, 2023
We model a coronal loop as a 3D magnetic cylinder in a realistic solar atmosphere that extends from the chromosphere to the corona. Kink oscillations, believed to be ubiquitous in the solar corona, are launched in the loop.
Mingzhe Guo, Timothy Duckenfield, Tom Van Doorsselaere, Konstantinos Karampelas, Gabriel Pelouze, Yuhang Gao   +5 more
doaj   +1 more source

CHROMOSPHERIC HEATING by ACOUSTIC WAVES COMPARED to RADIATIVE COOLING [PDF]

, 2016
Acoustic and magnetoacoustic waves are among the possible candidate mechanisms that heat the upper layers of the solar atmosphere. A weak chromospheric plage near the large solar pore NOAA 11005 was observed on 2008 October 15, in the Fe I 617.3 nm and ...
Jurcak J., Berrilli, F, Sobotka M., Del Moro D., Svanda, M, Del Moro, D, Svanda M., Sobotka, M, Heinzel, P, Heinzel P., Berrilli F., Jurcak, J   +11 more
core   +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

Spatial and Temporal Analysis of Quiescent Coronal Rain over an Active Region

The Astrophysical Journal, 2023
The solar corona produces coronal rain, hundreds of times colder and denser material than the surroundings. Coronal rain is known to be deeply linked to coronal heating, but its origin, dynamics, and morphology are still not well understood.
Seray Şahin, Patrick Antolin, Clara Froment, Thomas A. Schad   +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