Results 91 to 100 of about 28,168 (221)

Assessment of DKIST/VTF capabilities for the detection of local acoustic source wavefronts

Frontiers in Astronomy and Space Sciences
IntroductionRecent studies have demonstrated that temporal filtering can successfully identify local acoustic source wavefronts in radiative magnetohydrodynamic simulations of the solar photosphere.
Corinne Morrell, Corinne Morrell, Mark P. Rast, Mark P. Rast, Shah Mohammad Bahauddin, Shah Mohammad Bahauddin, Ivan Milić   +6 more
doaj   +1 more source

Diffusion in the chromosphere and the composition of the solar corona and energetic particles [PDF]

Composition observations, in the solar photosphere, and in the upper transition region (TR) and corona imply a change of composition of the solar atmosphere somewhere between the photosphere and the upper TR.
Meyer, J. P., Vauclair, S.
core   +1 more source

Non linear evolution of Alfvén wave in the solar atmosphere [PDF]

, 2005
We investigate the non-linear evolution of Alfvén waves in the solar atmosphere and wind, from the photosphere out to the Earth’s orbit. Photosphere and chromosphere are modeled as isothermal layers in static equilibrium, connecting across the transition
Oughton, Sean, Velli, M., Verdini, A.
core   +1 more source

Solar surface and atmospheric dynamics: The Photosphere

, 2013
Various aspects of the magnetism of the quiet sun are reviewed. The suggestion that a small scale dynamo acting at granular scales generates what we call the quiet sun fields is studied in some detail.
Pillet, V. Martinez
core   +1 more source

Backscatter of hard X-rays in the solar atmosphere [PDF]

The solar photosphere backscatters a substantial fraction of the hard X rays from solar flares incident upon it. This reflection was studied using a Monte Carlo simulation which takes into account Compton scattering and photo-electric absorption.
Bai, T., Ramaty, R.
core   +1 more source

Inferring Photospheric Horizontal Flows from Multiple Observations with SUVEL Models

The Astrophysical Journal
Photospheric horizontal velocity fields play essential roles in the formation and evolution of numerous solar activities. Various methods for estimating the horizontal velocity field have been proposed in the past.
Quan Xie, Jiajia Liu, Robert Erdélyi, Yuming Wang   +3 more
doaj   +1 more source

Magnetic probing of the solar interior [PDF]

The magnetic field patterns in the region beneath the solar photosphere is determined. An approximate method for downward extrapolation of line of sight magnetic field measurements taken at the solar photosphere was developed.
Benton, E. R., Estes, R. H.
core   +1 more source

Refinements to the Solar Polar Magnetic Flux: Implications from Inversion Methodologies

The Astrophysical Journal
The magnetic fields in the solar polar region are important to our understanding of the internal dynamo process, the global coronal structure, and the origin of the solar wind.
Bryan Yamashiro, Xudong Sun, Ivan Milić, Carlos Quintero Noda, Adur Pastor Yabar, Rebecca Centeno, Jiayi Liu, Milan Gošić, Kai Yang   +8 more
doaj   +1 more source

Magnetic fields of an active region filament from full Stokes analysis of Si I 1082.7 nm and He I 1083.0 nm

, 2012
Vector magnetic fields of an active region filament in the photosphere and upper chromosphere are obtained from spectro-polarimetric observations recorded with the Tenerife Infrared Polarimeter (TIP II) at the German Vacuum Tower Telescope (VTT).
A. Lagg, Asensio Ramos, Canou, Centeno, Collados, Georgoulis, Guo, Harvey, Kurucz, Lagg, Leroy, Lin, Lites, Lites, López Ariste, Merenda, Okamoto, Paletou, Rüedi, S. Solanki, Sasso, Socas-Navarro, Solanki, Trujillo Bueno, Wang, Y. Liu, Z. Xu   +26 more
core   +1 more source

Multi-height probing of horizontal flows in the solar photosphere

Astronomy & Astrophysics
Context. Optical flow methods aim to infer horizontal (transverse, in the general case) velocities in the solar atmosphere from the temporal changes in maps of physical quantities, such as intensity or magnetic field.
Kostić T., Milić I., Rempel M., Welsch B., Kazachenko M., Asensio Ramos A., Tremblay B.   +6 more
doaj   +1 more source