Results 31 to 40 of about 881 (218)

HEATING OF THE SOLAR CHROMOSPHERE AND CORONA BY ALFVÉN WAVE TURBULENCE [PDF]

The Astrophysical Journal, 2011
A three-dimensional MHD model for the propagation and dissipation of Alfven waves in a coronal loop is developed. The model includes the lower atmospheres at the two ends of the loop. The waves originate on small spatial scales (less than 100 km) inside the kilogauss flux elements in the photosphere.
van Ballegooijen, A. A., Asgari-Targhi, M., Cranmer, S. R., DeLuca, E. E.   +3 more
openaire   +2 more sources

ON THE SPATIAL SCALES OF WAVE HEATING IN THE SOLAR CHROMOSPHERE

The Astrophysical Journal, 2015
Dissipation of magnetohydrodynamic (MHD) wave energy has been proposed as a viable heating mechanism in the solar chromospheric plasma. Here, we use a simplified one-dimensional model of the chromosphere to theoretically investigate the physical processes and the spatial scales that are required for the efficient dissipation of Alfvén waves and slow ...
Roberto Soler, Marc Carbonell, Jose Luis Ballester   +2 more
openaire   +2 more sources

Solar Atmospheric Heating Due to Small-scale Events in an Emerging Flux Region

The Astrophysical Journal, 2023
We investigate the thermal, kinematic, and magnetic structure of small-scale heating events in an emerging flux region (EFR). We use high-resolution multiline observations (including Ca ii 8542 Å, Ca ii K, and the Fe i 6301 Å line pair) of an EFR located
Rahul Yadav, Maria D. Kazachenko, Andrey N. Afanasyev, Jaime de la Cruz Rodríguez, Jorrit Leenaarts   +4 more
doaj   +1 more source

Chromospheric Downflows as a Diagnostic of Solar Flare Heating [PDF]

International Astronomical Union Colloquium, 1989
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 ...
Dominic M. Zarro, Richard C. Canfield
openaire   +1 more source

Observational signatures of waves and flows in the solar corona [PDF]

, 2015
DM acknowledges support of a Royal Society University Research Fellowship and a KU Leuven Research Council senior research fellowship (SF/12/008). The research leading to these results has also received funding from the European Commission Seventh ...
Antolin, Patrick, Van Doorsselaere, T., De Moortel, I., Van Doorsselaere, Tom   +3 more
core   +1 more source

Spatio-temporal analysis of chromospheric heating in a plage region

, 2022
Context. Our knowledge of the heating mechanisms that are at work in the chromosphere of plage regions remains highly unconstrained from observational studies.
de la Cruz Rodríguez, Jaime,, Díaz Baso, Carlos José,, J. Leenaarts, Leenaarts, Jorrit,, J. de la Cruz Rodríguez, C. J. Díaz Baso, R. Morosin, Morosin, Roberta,   +7 more
core   +1 more source

Heating of the solar chromosphere through current dissipation

Astronomy & Astrophysics, 2022
Context.The solar chromosphere is heated to temperatures higher than predicted by radiative equilibrium. This excess heating is greater in active regions where the magnetic field is stronger.Aims.We aim to investigate the magnetic topology associated with an area of enhanced millimeter (mm) brightness temperatures in a solar active region mapped by the
J. M. da Silva Santos, S. Danilovic, J. Leenaarts, J. de la Cruz Rodríguez, X. Zhu, S. M. White, G. J. M. Vissers, M. Rempel   +7 more
openaire   +3 more sources

The Flare Irradiance Spectral Model‐Version 2 (FISM2)

Space Weather, Volume 18, Issue 12, December 2020., 2020
Abstract The Flare Irradiance Spectral Model (FISM) is an important tool for estimating solar variability for a myriad of space weather research studies and applications, and FISM Version 2 (FISM2) recently was released. FISM2 is an empirical model of the solar ultraviolet irradiance created to fill spectral and temporal gaps in the satellite ...
P. C. Chamberlin, F. G. Eparvier, V. Knoer, H. Leise, A. Pankratz, M. Snow, B. Templeman, E. M. B. Thiemann, D. L. Woodraska, T. N. Woods   +9 more
wiley   +1 more source

Fast Magnetic Wave Could Heat the Solar Low-beta Chromosphere [PDF]

The Astrophysical Journal Letters, 2021
Abstract Magnetohydrodynamic (MHD) waves are candidates for heating the solar chromosphere, although it is still unclear which mode of the wave is dominant in heating. We perform two-dimensional radiative MHD simulation to investigate the propagation of MHD waves in the quiet region of the solar chromosphere.
Yikang Wang, Takaaki Yokoyama, Haruhisa Iijima   +2 more
openaire   +2 more sources

Benchmarking Forecasting Models for Space Weather Drivers

Space Weather, Volume 18, Issue 10, October 2020., 2020
Abstract Space weather indices are commonly used to drive operational forecasts of various geospace systems, including the thermosphere for mass density and satellite drag. The drivers serve as proxies for various processes that cause energy flow and deposition in the geospace system.
Richard J. Licata, W. Kent Tobiska, Piyush M. Mehta   +2 more
wiley   +1 more source