Results 41 to 50 of about 12,081 (211)

Heating of the Solar Corona

The Astrophysical Journal, 1968
The suggestion is advanced that heating of the solar corona results from Landau damping of ion-acoustic waves generated in the motion of photospheric granules. Laboratory experiments relevant to the question of corona heating are discussed, together with the available observational information on the extent of energy deposition in the corona.
openaire   +1 more source

Modelling the total solar eclipse in 2024 with COCONUT

Astronomy & Astrophysics
Context. Coronal modelling is crucial for a better understanding of solar physics and heliophysics. Accurate plasma conditions at the outer boundary of a solar corona lead to more precise space weather predictions.
Baratashvili T., Wang H. P., Sorokina D., Lani A., Poedts S.   +4 more
doaj   +1 more source

On ion-cyclotron-resonance heating of the corona and solar wind [PDF]

Nonlinear Processes in Geophysics, 2003
This paper concisely summarizes and critically reviews recent work by the authors on models of the heating of the solar corona by resonance of ions with high-frequency waves (up to the proton cyclotron frequency).
E. Marsch, C. Vocks, C.-Y. Tu
doaj  

A New Insight into the Linear Theory of Magnetoacoustic Waves in the Homogeneous Flux Tubes with an Abrupt Boundary

The Astrophysical Journal, 2023
An important and interesting issue is brought to notice in the standard linear theory of the magnetoacoustic waves in the homogeneous magnetic flux tubes with an abrupt magnetic boundary, which are representative of the coronal, chromospheric, and ...
Naga Varun Yelagandula
doaj   +1 more source

The Dipolar Solar Minimum Corona

Universe, 2021
The large-scale configuration of the UV solar corona at the minimum activity between solar cycles 22 and 23 is explored in this paper. Exploiting a large sample of spectroscopic observations acquired by the Ultraviolet Coronagraph Spectrometer aboard the
Daniele Telloni
doaj   +1 more source

3D reconstruction of coronal loops by the principal component analysis [PDF]

, 2013
Knowing the three dimensional structure of plasma filaments in the uppermost part of the solar atmosphere, known as coronal loops, and especially their length, is an important parameter in the wave-based diagnostics of this part of the Sun.
Nisticò, Giuseppe, Valery Nakariakov, Giuseppe Nisticò, Erwin Verwichte, Valery M. Nakariakov, Verwichte, E. (Erwin), Nakariakov, V. M. (Valery M.)   +6 more
core   +1 more source

A Comprehensive Model of the K-coronal Spectrum for the Inference of Electron Temperature and Bulk Flow Velocity in the Corona

The Astrophysical Journal Supplement Series
The electron temperature of the corona is one of the key physical parameters which reflect the complexity of coronal-heating processes. L. E. Cram was the first to show that the K-coronal spectrum, produced by the scattering of the photospheric spectrum ...
Jindřich Dospiva, Hana Druckmüllerová
doaj   +1 more source

Numerical simulations of a flux rope ejection

, 2015
Coronal mass ejections (CMEs) are the most violent phenomena observed on the Sun. One of the most successful models to explain CMEs is the flux rope ejection model, where a magnetic flux rope is expelled from the solar corona after a long phase along ...
Pagano, P., Poedts, Stefaan, Poedts S., Mackay D. H., Mackay, D.H., Poedts, S., Pagano P.   +6 more
core   +1 more source

Statistics of counter-streaming solar wind suprathermal electrons at solar minimum : STEREO observations [PDF]

, 2010
Previous work has shown that solar wind suprathermal electrons can display a number of features in terms of their anisotropy. Of importance is the occurrence of counter-streaming electron patterns, i.e., with "beams" both parallel and anti-parallel to ...
Skoug, R. M., C. Mazelle, A. Opitz, Luhmann, J.G., E. Penou, Penou, E., C. Jacquey, Génot, Vincent, Larson, D. E., Jian, L., Sauvaud, J.-A., Fedorov, A., Jacquey, C.J., P. Schroeder, Gosling, J.T., Skoug, R.M., R. M. Skoug, Jacquey, C., K. D. Simunac, Meziane, K., Russell, C. T., Lavraud, B., C. Foullon, Foullon, C., J.-A. Sauvaud, Sauvaud, Jean-André, Rouillard, A.P., I. Dandouras, Rouillard, A. P., Génot, V., Luhmann, J. G., J. T. Gosling, C. T. Russell, J. T. Steinberg, Foullon, C. (Claire), A. B. Galvin, Opitz, A., Simunac, K. D., Larson, D.E., K. Meziane, Mazelle, C., Foullon, Claire, A. Fedorov, Galvin, A. B., J. G. Luhmann, Sauvaud, J.A., P. Louarn, Russell, C. T. (Christopher T.), Steinberg, John Tyree, D. E. Larson, Dandouras, I., Steinberg, J. T., Simunac, K.D.C., A. P. Rouillard, Schroeder, P., Russell, C.T., Galvin, A.B., Steinberg, J.T., Gosling, J. T., L. Jian, Louarn, P., V. Génot, B. Lavraud   +62 more
core   +1 more source

Periodic Variations in Visible Light Brightness as Tracers of Fine Coronal Structures

The Astrophysical Journal
The quiescent or dynamic nature of fine-scale raylike features in the Sun corona, observed in visible light, is still an open question. Here, we show that most of the daily and hourly periodic variations in visible light brightness of the high corona (up
Nathalia Alzate, Simone Di Matteo
doaj   +1 more source