Results 11 to 20 of about 941 (201)

Radio observations of the quiet solar corona

Advances in Space Research, 1994
Abstract Observations of radio emission from the quiet solar atmosphere and the associated emission mechanisms are discussed. Long wavelength observations, with a spatial resolution of ∼1 arc min are ideal for the study of the large scale structure of the corona, including coronal holes, arches, streamers and the base of the heliospheric current ...
Alissandrakis, C. E.
openaire   +3 more sources

A nanoflare heating model for the quiet solar corona [PDF]

Astronomy & Astrophysics, 2001
11 pages, 7 figures, updated spelling of 1st autor's ...
Mitra-Kraev, U., Benz, A. O.
openaire   +3 more sources

Thermal structuring of the quiet solar corona

Astronomy & Astrophysics
Context. The quiet solar atmosphere is populated with plasma loops that are typically observed in the ultraviolet (UV) and extreme-ultraviolet (EUV) wavelengths. The coronal counterparts of these loops are traditionally referred to as coronal bright points.
N. Milanović, H. Peter, L. P. Chitta, P. R. Young   +3 more
openaire   +2 more sources

Beyond small-scale transients: A closer look at the diffuse quiet solar corona

Astronomy & Astrophysics, 2023
Aims. Within the quiet Sun corona imaged at 1 MK, much of the field of view consists of diffuse emission that appears to lack the spatial structuring that is so evident in coronal loops or bright points. Our aim is to determine if these diffuse regions are categorically different in terms of their intensity fluctuations and spatial configuration from ...
Gorman, J., Chitta, L., Peter, H., Berghmans, D., Auchère, F., Aznar Cuadrado, R., Teriaca, L., Solanki, S., Verbeeck, C., Kraaikamp, E., Stegen, K., Gissot, S.   +11 more
openaire   +4 more sources

Propagating and Stationary Bright Knots in the Quiet Solar Corona

The Astrophysical Journal
Small-sized localized brightenings are an important candidate for resolving the problem of the solar atmospheric heating. They are spread over the whole solar disk and are suggested to be caused by magnetic reconnection or wave dissipation.
Shaoxuan Tong, Jun Zhang
doaj   +2 more sources

How Are the Abnormally Hot Chromosphere and Corona Heated by the Solar Magnetic Fields?

The Astrophysical Journal
The corona is a structure possessed by stars, including the Sun. The abnormal heating of the solar corona and chromosphere is one of the greatest mysteries in modern astronomy.
K. J. Li, J. C. Xu, W. Feng, J. L. Xie, X. J. Shi, L. H. Deng   +5 more
doaj   +2 more sources

Extreme-ultraviolet transient brightenings in the quiet-Sun corona

Astronomy & Astrophysics
Context. The extreme-ultraviolet (EUV) brightenings identified by Solar Orbiter, commonly known as campfires, are the smallest transient brightenings detected to date outside active regions in the solar corona. Aims. In order to understand their possible contribution to quiet-Sun heating, we investigated the spatio-temporal distribution of a large ...
Nancy Narang, Cis Verbeeck, Marilena Mierla, David Berghmans, Frédéric Auchère, Sergei Shestov, Véronique Delouille, Lakshmi Pradeep Chitta, Eric Priest, Daye Lim, Laurent R. Dolla, Emil Kraaikamp   +11 more
openaire   +3 more sources

Relevant heating of the quiet solar corona by Alfvén waves: a result of adiabaticity breakdown. [PDF]

Sci Rep, 2019
AbstractIon heating by Alfvén waves has been considered for long as the mechanism explaining why the solar corona has a temperature several orders of magnitude higher than the photosphere. Unfortunately, as the measured wave frequencies are much smaller than the ion cyclotron frequency, particles were expected to behave adiabatically, impeding a direct
Escande DF, Gondret V, Sattin F.
europepmc   +5 more sources

Probing the Quiet Solar Atmosphere from the Photosphere to the Corona [PDF]

Solar Physics, 2018
We investigate the morphology and temporal variability of a quiet Sun network region in different solar layers. The emission in several EUV spectral lines through both raster and slot time series, recorded by EIS/Hinode is studied along with H$α$ observations and high resolution spectropolarimetric observations of the photospheric magnetic field.
Ioannis Kontogiannis, Costis Gontikakis, Georgia Tsiropoula, Kostas Tziotziou   +3 more
openaire   +2 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   +1 more source