Results 11 to 20 of about 11,539 (164)

MAGNETIC BRIGHT POINTS IN THE QUIET SUN [PDF]

The Astrophysical Journal, 2010
We present a visual determination of the number of bright points (BPs) existing in the quiet Sun, which are structures though to trace intense kG magnetic concentrations. The measurement is based on a 0.1 arcsec angular resolution G-band movie obtained with the Swedish Solar Telescope at the solar disk center.
Sanchez Almeida, J, Bonet, JA, Viticchie', B, DEL MORO, DARIO   +3 more
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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

The quiet-Sun photosphere and chromosphere [PDF]

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2012
Abstract The overall structure and the fine structure of the solar photosphere outside active regions are largely understood, except possibly the important roles of a turbulent near-surface dynamo at its bottom, internal gravity waves at its top and small-scale vorticity. Classical one-dimensional static radiation-escape modelling has
openaire   +3 more sources

The dynamic chromosphere at millimeter wavelengths

Frontiers in Astronomy and Space Sciences, 2022
The chromosphere is one of the most complex and dynamic layers of the solar atmosphere. The dynamic phenomena occur on different spatial and temporal scales, not only in active regions but also in the so-called quiet Sun.
Alexander Nindos, Spiros Patsourakos, Shahin Jafarzadeh, Shahin Jafarzadeh, Masumi Shimojo, Masumi Shimojo   +5 more
doaj   +1 more source

Quantifying and containing the curse of high resolution coronal imaging [PDF]

Annales Geophysicae, 2008
Future missions such as Solar Orbiter (SO), InterHelioprobe, or Solar Probe aim at approaching the Sun closer than ever before, with on board some high resolution imagers (HRI) having a subsecond cadence and a pixel area of about (80 km)2 at the Sun ...
V. Delouille, P. Chainais, J.-F. Hochedez   +2 more
doaj   +1 more source

CAII lines in a quiet region on the Sun I. Dynamic processes in the solar atmosphere

Solar-Terrestrial Physics, 2023
We have studied oscillation processes in the quiet Sun outside a coronal hole at different levels of the solar chromosphere. The study was based on spectroscopic observations of ionized calcium lines (K, H, and 849.8 nm) obtained by the Sayan Solar ...
Turova I. P., Grigoryeva S. A., Ozhogina O. A.   +2 more
doaj   +1 more source

Substructure of quiet sun bright points [PDF]

Proceedings of the International Astronomical Union, 2010
AbstractSince photospheric bright points (BPs) were first observed, there has been a question as to how are they structured. Are they just single flux tubes or a bundle of the flux-tubes? Surface photometry of the quiet Sun (QS) has achieved resolution close to 0.1″ with the New Solar Telescope at Big Bear Solar Observatory.
Andic, Aleksandra, Chae, Jongchul, Goode, Phillip R.   +2 more
openaire   +2 more sources

Hierarchical analysis of the quiet-Sun magnetism [PDF]

Astronomy & Astrophysics, 2014
Standard statistical analysis of the magnetic properties of the quiet Sun rely on simple histograms of quantities inferred from maximum-likelihood estimations. Because of the inherent degeneracies, either intrinsic or induced by the noise, this approach is not optimal and can lead to highly biased results.
Ramos, A. Asensio, González, M. J. Martínez   +1 more
openaire   +2 more sources

PRELIMINARY RESULTS OF INTERFEROMETRIC OBSERVATIONS OF THE QUIET SUN AT THE FREQUENCIES 8 – 32 MHZ

Odessa Astronomical Publications, 2018
We studied a radio emission of the quiet Sun at decameter wavelengths to determine its angular dimensions. Observations were conducted using interferometers composed of antenna sections of the UTR-2 radio telescope.
V. A. Shepelev, V. N. Melnik, R. V. Vashchishin   +2 more
doaj   +1 more source

Statistical Features of the Quiet Sun in EUV [PDF]

Symposium - International Astronomical Union, 2001
Frequency distributions of the intensities of EUV emission lines in the quiet Sun have in the past usually been modelled using two Gaussians. Here we test this and other distribution functions against observed distributions with exceptional statistics. The data were obtained in a number of spectral lines observed with CDS and SUMER.
Pauluhn, A., Solanki, S., Rüedi, I., Landi, E., Schühle, U.   +4 more
openaire   +2 more sources