Results 31 to 40 of about 11,319 (196)

Turbulent cross-field transport of non-thermal electrons in coronal loops: theory and observations [PDF]

, 2011
<p><b>Context:</b> A fundamental problem in astrophysics is the interaction between magnetic turbulence and charged particles. It is now possible to use Ramaty High Energy Solar Spectroscopic Imager (RHESSI) observations of hard X-rays (
A. L. MacKinnon, Antonucci, Aschwanden, Aschwanden, Balescu, Balescu, Bian, Bitane, Brown, Brown, Brown, Bykov, Bykov, Chiueh, Corrsin, Doschek, Doyle, E. P. Kontar, Fludra, Galloway, Hamilton, Hara, Hauff, Hurford, Imada, Isichenko, Jokipii, Kadomtsev, Kontar, Kontar, Kontar, Kosugi, Larosa, Lin, Lin, Lin, Litvinenko, Melrose, Miller, Milovanov, Mrozek, N. H. Bian, Petrosian, Prato, Pérez, Rechester, Saint-Hilaire, Shibata, Somov, Vlad, Xu, Zimbardo   +51 more
core   +2 more sources

Standing Kink Waves in Sigmoid Solar Coronal Loops: Implications for Coronal Seismology [PDF]

The Astrophysical Journal Letters, 2020
Abstract Using full three-dimensional magnetohydrodynamic numerical simulations, we study the effects of magnetic field sigmoidity or helicity on the properties of the fundamental kink oscillation of solar coronal loops. Our model consists of a single denser coronal loop, embedded in a plasma with dipolar force-free magnetic field with a
N. Magyar, V. M. Nakariakov
openaire   +2 more sources

Structure of solar coronal loops: from miniature to large-scale [PDF]

, 2013
We will use new data from the High-resolution Coronal Imager (Hi-C) with unprecedented spatial resolution of the solar corona to investigate the structure of coronal loops down to 0.2 arcsec.
Bingert, S., Cirtain, J. W., de Forest, C., Golub, L., Klimchuk, J. A., Kobayashi, K., Korreck, K. E., Peter, H., Winebarger, A. R.   +8 more
core   +1 more source

Are Nonthermal Velocities in Active Region Coronal Loops Anisotropic?

The Astrophysical Journal, 2023
We have measured line widths in active region coronal loops in order to determine whether the nonthermal broadening is anisotropic with respect to the magnetic field direction. These nonthermal velocities are caused by unresolved fluid motions.
Michael Hahn, Mahboubeh Asgari-Targhi, Daniel Wolf Savin   +2 more
doaj   +1 more source

On active region loops: Hinode/EIS observations

, 2008
Coronal loops are fundamental building blocks of the solar active regions and the corona. Therefore, a clear understanding of the physics of coronal loops will help us understand the physics of active region heating in particular and coronal heating in ...
Antolin, Arnaud, Aschwanden, Bhola N. Dwivedi, Cargill, Cirtain, Dammasch, Del Zanna, Del Zanna, Dere, Doschek, Durgesh Tripathi, Feldman, Giulio Del Zanna, Hara, Harra, Helen E. Mason, Landi, Marsch, Patsourakos, Peter, Peter R. Young, Schmelz, Schmelz, Teriaca, Tripathi, Tripathi, Warren, Young, Young   +29 more
core   +1 more source

Self-organized braiding in solar coronal loops [PDF]

Journal of Plasma Physics, 2015
AbstractIn this paper, we investigate the evolution of braided solar coronal loops. We assume that coronal loops consist of several internal strands which twist and braid about each other. Reconnection between the strands leads to small flares and heating of the loop to x-ray temperatures.
Berger, M.A., Asgari-Targhi, M., DeLuca, E.E.   +2 more
openaire   +2 more sources

Coronal hole boundaries evolution at small scales: I. EIT 195 A and TRACE 171 A view

, 2009
We aim at studying the small-scale evolution at the boundaries of an equatorial coronal hole connected with a channel of open magnetic flux with the polar region and an `isolated' one in the extreme-ultraviolet spectral range.
Madjarska, M. S., Wiegelmann, T.
core   +1 more source

Spatial magneto-seismology : effect of density stratification on the first harmonic amplitude profile of transversal coronal loop oscillations [PDF]

, 2007
Context. The new generation of extreme-ultraviolet (EUV) imagers onboard missions such as the Solar Dynamics Observatory (SDO)and Solar Orbiter (SO) will provide the most accurate spatial measurements of post-flare coronal loop oscillations yet.
Erdélyi, R. (Robertus), Goossens, Marcel, Van Doorsselaere, Tom, Verth, G.   +3 more
core   +2 more sources

Plasma injection into a solar coronal loop [PDF]

Astronomy & Astrophysics, 2019
Context. The details of the spectral profiles of extreme UV emission lines from solar active regions contain key information for investigating the structure, dynamics, and energetics of the solar upper atmosphere. Aims. We characterize the line profiles not only through the Doppler shift and intensity of the bulk part of the profile.
Li, L., Peter, H.
openaire   +3 more sources

Thread Separation and Expansion Observed in Multistranded Solar Coronal Loops

The Astrophysical Journal
The theoretical expectation that coronal loops should expand with height contrasts with observations that typically show constant cross sections. We investigate the idea that this discrepancy results from loops being composed of fine threads whose ...
David H. Brooks, Harry P. Warren
doaj   +1 more source