Results 101 to 110 of about 1,036,703 (213)

Granulation and supergranulation as convective modes in the solar envelope

, 1981
The stability of linear convective modes in the solar convection zone is investigated by incorporating the mechanical and thermal effects of turbulence through the eddy transport coefficients. The inclusion of turbulent thermal conductivity and viscosity,
Chitre, S. M., Pandey, S. K., Antia, H. M.   +2 more
core   +1 more source

The making of robust and highly performing imaging spectropolarimeters for large solar telescopes

Astronomy & Astrophysics
We discuss the requirements, concepts, simulations, implementation, and calibration of two dual Fabry-Perot (FPI)-based imaging spectropolarimeters, CRISP and CHROMIS, at the Swedish 1-m Solar Telescope, and CRISP2, which is under construction.
Scharmer G. B., de la Cruz Rodríguez J., Leenaarts J., Lindberg B., Sütterlin P., Hillberg T., Pietraszewski C., de Wijn A. G., Foster M., Storey J.   +9 more
doaj   +1 more source

Structure properties of supergranulation and granulation

, 2004
We investigate spatial dislocation ordering of the solar structures associated with supergranulation and granulation scales. The supergranular and granular structures are automatically segmented from time-distance divergence maps and from broad-band ...
Duvall TL, Koshovichev AG, Berrilli F, Del Moro D, Consolini G, PIETROPAOLO, Ermanno   +5 more
core   +1 more source

The Stagger Code for Accurate and Efficient, Radiation-coupled Magnetohydrodynamic Simulations

The Astrophysical Journal
We describe the Stagger code for simulations of magnetohydrodynamic (MHD) systems. This is a modular code with a variety of physics modules that will let the user run simulations of deep stellar atmospheres, sunspot formation, stellar chromospheres and ...
Robert F. Stein, Åke Nordlund, Remo Collet, Regner Trampedach   +3 more
doaj   +1 more source

A decade of solar high-fidelity spectroscopy and precise radial velocities from HARPS-N

Astronomy & Astrophysics
Context. The HARPS-N solar telescope has been observing the Sun every possible day since the summer of 2015. We have recently released 10 years of these data, which are available online. Aims.
Dumusque X., Al Moulla K., Cretignier M., Buchschacher N., Segransan D., Phillips D. F., Affer L., Aigrain S., Anna John A., Bonomo A. S., Bourrier V., Buchhave L. A., Collier Cameron A., Cegla H. M., Cortés-Zuleta P., Cosentino R., Costes J., Damasso M., de Beurs Z. L, Ehrenreich D., Ghedina A., Gonzales M., Haywood R. D., Klein B., Lakeland B. S., Langellier N., Latham D. W., Leleu A., Lodi M., Lopez-Morales M., Lovis C., Malavolta L., Maldonado J., Mantovan G., Matínez Fiorenzano A. F., Micela G., Milbourne T., Molinari E., Mortier A., Naponiello L., Nicholson B. A., O’Sullivan N. K., Pepe F., Pinamonti M., Piotto G., Rescigno F., Rice K., Dimitar S., Silva A. M., Sozzetti A., Stalport M., Tavella S., Udry S., Vanderburg A., Vissapragada S., Watson C. A.   +55 more
doaj   +1 more source

Exposure-averaged Gaussian Processes for Combining Overlapping Datasets

The Astronomical Journal
Physically motivated Gaussian process (GP) kernels for stellar variability, like the commonly used damped, driven simple harmonic oscillators that model stellar granulation and p -mode oscillations, quantify the instantaneous covariance between any two ...
Jacob K. Luhn, Ryan A. Rubenzahl, Samuel Halverson, Lily L. Zhao   +3 more
doaj   +1 more source

Investigating white-light flare mechanisms via the Paschen jump using high-resolution continuum observations from the Swedish 1-m Solar Telescope

Astronomy & Astrophysics
Context. The continuum is understood to contain a large portion of the energy emitted by a solar flare. The optical continuum, known as white light (WL), is particularly relevant since it may be observed by ground-based instruments. Aims. We measured the
Ornig S., Rouppe van der Voort L., Carlsson M., Díaz Baso C. J., Øyre E. S., Soler Poquet I. J., Brunvoll A. R.   +6 more
doaj   +1 more source

Solar Granulation [PDF]

Monthly Notices of the Royal Astronomical Society, 1936
openaire   +1 more source

High-resolution Observations of an X-1.0 White-light Flare with Moving Flare Ribbons

The Astrophysical Journal Letters
We analyze high-resolution observations of an X-1.0 white-light flare, triggered by a filament eruption, on 2022 October 2. The full process of filament formation and subsequent eruption was captured in the H α passband by the Visible Imaging ...
Xu Yang, Meiqi Wang, Andrew Cao, Kaifan Ji, Vasyl Yurchyshyn, Jiong Qiu, Sijie Yu, Jinhua Shen, Wenda Cao   +8 more
doaj   +1 more source

Line formation in solar granulation - I. Fe line shapes, shifts and asymmetries

, 2000
Realistic ab-initio 3D, radiative-hydrodynamical convection simulations of the solar granulation have been applied to Fe I and Fe II line formation. In contrast to classical analyses based on hydrostatic ID model atmospheres the procedure contains no ...
Asplund, M,, Nordlund, A, Trampedach, R, Prieto, CA, Stein, RF   +4 more
core