Results 71 to 80 of about 1,370 (209)

Nanoflare Heating of the Corona Revisited

The Astrophysical Journal, 2004
The radiative signatures of the nanoflare model for coronal heating are investigated. If an observed coronal loop is assumed to consist of many small strands that cannot be distinguished spatially by EUV or X-ray observations, we are able to calculate differential emission-measure profiles and filling factors for a range of heating models.
Peter J. Cargill, James A. Klimchuk
openaire   +1 more source

Nanoflares: Differential Emission Measure

, 2014
Final presentations of the Center for Astrophysics HEA/SSP Solar Summer Intern Program.
openaire   +1 more source

Nanoflare Heating in the Solar Corona

, 2014
We employ a three dimensional magneto-hydrodynamical (3D MHD) model to investigate the statistics of the spatial and temporal distribution of the coronal heating. The model describes the evolution of the solar corona above an observed Active Region. This model is additionally compared to coronal models where the underlying photospheric magnetic field ...
Bingert, Sven, Hardi, Peter, Nagel, W., Kröner, D., Resch, M.   +4 more
openaire   +3 more sources

A Unified Picture of Swirl-driven Solar Coronal Heating: Magnetic Energy Supply and Dissipation

The Astrophysical Journal Letters
The coronal heating problem is one of the most critical challenges in solar physics. Recent observations have revealed that small-scale swirls are ubiquitous in the photosphere and chromosphere, suggesting that they may play a significant role in ...
Hidetaka Kuniyoshi, Shinsuke Imada, Takaaki Yokoyama   +2 more
doaj   +1 more source

Solar Particle Acceleration

Astronomy
High-energy particles may be accelerated widely in stellar coronae; probably by the same processes we find in the Sun. Here, we have learned of two physical mechanisms that dominate the acceleration of solar energetic particles (SEPs).
Donald V. Reames
doaj   +1 more source

Observations of Nonthermal Velocities and Comparisons with an Alfvén Wave Turbulence Model in Solar Active Regions

The Astrophysical Journal
We present a study of spectral line width measurements from the Extreme-ultraviolet Imaging Spectrometer on Hinode. We used spectral line profiles of Fe xvi 262.984 Å, Fe xiv 264.787 Å, Fe xiv 270.519 Å, Fe xiv 274.203 Å, and Fe xv 284.160 Å, and studied
M. Asgari-Targhi, D. H. Brooks, M. Hahn, S. Imada, E. Tajfirouze, D. W. Savin   +5 more
doaj   +1 more source

NGTS Observations of Enhanced Nanoflare Activity in Fully Convective Stars Linked to Plasma Resistivity [PDF]

, 2021
C. J. Dillon, D. B. Jess, M. Mathioudakis, Chris Watson, James A. G. Jackman, P. J. Wheatley, M. R. Goad, S. L. Casewell, D. R. Anderson, M. R. Burleigh, S. D. T. Grant, R. G. West, José I Vines   +12 more
openalex   +1 more source

Nanoflare Heating: Observations and Theory

, 2017
This is a review of the observational and theoretical evidence for nanoflare heating of the magnetically-closed corona.
openaire   +2 more sources

Nonthermal Spectral Line Broadening and the Nanoflare Model

The Astrophysical Journal, 2006
A number of theoretical and observational considerations suggest that coronal loops are bundles of unresolved, impulsively heated strands. This ‘‘nanoflare’’ model, as it is sometimes called, predicts high-speed evaporative upflows, which might be revealed as nonthermal broadening of spectral line profiles.
Patsourakos, S., Klimchuk, J. A.
openaire   +2 more sources

Functional Nucleic Acid Probes Based on Two-Photon for Biosensing. [PDF]

Biosensors (Basel), 2023
Wu K, Ma C, Wang Y.
europepmc   +1 more source