Results 21 to 30 of about 1,149,927 (208)

Topological structure of the magnetic solar corona [PDF]

, 2007
The solar corona is a highly complex and active plasma environment, containing many exotic phenomena such as solar flares, coronal mass ejections, prominences, coronal loops, and bright points.
Maclean, Rhona Claire
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

MHD turbulence and heating of the open field-line solar corona [PDF]

, 2003
This paper discusses the possibility that heating of the solar corona in open field-line regions emanating from coronal holes is due to a nonlinear cascade, driven by low-frequency or quasi-static magnetohydrodynamic fluctuations.
Dmitruk, Pablo, Milano, L., Matthaeus, William H., Dmitruk, P., Milano, L. J., Matthaeus, W. H., Mullan, D. J., Oughton, Sean, S. Oughton, P. Dmitruk, W. H. Matthaeus, L. Milano, Oughton, S., D. J. Mullan   +13 more
core   +2 more sources

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

Fleeting Small-scale Surface Magnetic Fields Build the Quiet-Sun Corona

The Astrophysical Journal Letters, 2023
Arch-like loop structures filled with million Kelvin hot plasma form the building blocks of the quiet-Sun corona. Both high-resolution observations and magnetoconvection simulations show the ubiquitous presence of magnetic fields on the solar surface on ...
L. P. Chitta, S. K. Solanki, J. C. del Toro Iniesta, J. Woch, D. Calchetti, A. Gandorfer, J. Hirzberger, F. Kahil, G. Valori, D. Orozco Suárez, H. Strecker, T. Appourchaux, R. Volkmer, H. Peter, S. Mandal, R. Aznar Cuadrado, L. Teriaca, U. Schühle, D. Berghmans, C. Verbeeck, A. N. Zhukov, E. R. Priest   +21 more
doaj   +1 more source

From Coronal Holes to Pulsars and Back Again: Learning the Importance of Data

Frontiers in Astronomy and Space Sciences, 2022
Although wanting to become an astronomer from an early age, I ended up in solar physics purely by chance, after first working in high-energy astrophysics.
Y.-M. Wang
doaj   +1 more source

Dominance of Bursty over Steady Heating of the 4–8 MK Coronal Plasma in a Solar Active Region: Quantification Using Maps of Minimum, Maximum, and Average Brightness

The Astrophysical Journal, 2022
A challenge in characterizing active region (AR) coronal heating is in separating transient (bursty) loop heating from the diffuse background (steady) heating.
Sanjiv K. Tiwari, Lucy A. Wilkerson, Navdeep K. Panesar, Ronald L. Moore, Amy R. Winebarger   +4 more
doaj   +1 more source

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

Current sheets in the solar corona : formation, fragmentation and heating [PDF]

, 2011
In this thesis we investigate current sheets in the solar corona. The well known 1D model for the tearing mode instability is presented, before progressing to 2D where we introduce a non-uniform resistivity.
Bowness, Ruth
core   +2 more sources

Modelling of Solar Coronal Loops [PDF]

Highlights of Astronomy, 1992
Modelling of coronal active regions in terms of loop structures began around 1974 (see Jordan 1975) and was stimulated by images of the corona in X-rays and the uv, obtained from rocket flights. Vaiana was a pioneer in this field (see Vaiana et al. 1973). The Skylab missions provided a fuller range of imaging and spectroscopic observations, and much of
openaire   +1 more source