Results 41 to 50 of about 37,593 (223)

Long-Term Variations in Background Bias and Magnetic Field Noise in HSOS/SMFT Observations

Universe
The Solar Magnetic Field Telescope (SMFT) at Huairou Solar Observing Station (HSOS) has conducted continuous observations of solar vector magnetic fields for nearly four decades, and while the primary optical system remains unchanged, critical components—
Haiqing Xu, Hongqi Zhang, Suo Liu, Jiangtao Su, Yuanyong Deng, Shangbin Yang, Mei Zhang, Jiaben Lin   +7 more
doaj   +1 more source

The Relation between the Radial Temperature Profile in the Chromosphere and the Solar Spectrum at Centimeter, Millimeter, Sub-millimeter, and Infrared Wavelengths

, 2014
Solar observations from millimeter to ultraviolet wavelengths show that there is a temperature minimum between photosphere and chromosphere. Analysis based on semi-empirical models locate this point at about 500 km over the photosphere.
A. Vourlidas, E.H. Avrett, E.H. Avrett, H. Uitenbroek, J.E. Vernazza, J.E. Vernazza, J.M. Fontenla, J.M. Fontenla, J.M. Fontenla, K. Shibasaki, M. Loukitcheva, P.A. Golovinskii, R. Liseau, R.L. Kurucz, S. Patsourakos, T.R. Ayres, V. Luz De la, V. Luz De la, V. Luz De la   +18 more
core   +1 more source

Ryugu Reference Project: Recommendations from the Measurement Definition Team

Meteoritics &Planetary Science, EarlyView.
Abstract Sample return missions play a significant role in planetary science by providing pristine extraterrestrial materials. JAXA's Hayabusa2 and NASA's OSIRIS‐REx missions have returned samples from the C‐type asteroids Ryugu and Bennu, respectively. The chemical and mineralogical compositions of these samples closely resemble those of CI chondrites,
Tetsuya Yokoyama, Guillaume Avice, Henner Busemann, Nicolas Dauphas, Daniel P. Glavin, Ashley J. King, Thorsten Kleine, Katharina Lodders, Frederic Moynier, Maria Schönbächler, Yoshinori Takano, Kun Wang, Hikaru Yabuta, Yuma Enokido, Ryota Fukai, Shogo Tachibana, Tomohiro Usui   +16 more
wiley   +1 more source

Structure of the solar photosphere studied from the radiation hydrodynamics code ANTARES [PDF]

, 2017
The ANTARES radiation hydrodynamics code is capable of simulating the solar granulation in detail unequaled by direct observation. We introduce a state-of-the-art numerical tool to the solar physics community and demonstrate its applicability to model ...
Grimm-Strele, H., Hanslmeier, A., Leitner, P., Lemmerer, B., Muthsam, H. J., Veronig, A., Zaqarashvili, T.   +6 more
core   +2 more sources

Integrating virtual reality experiences with preservice and inservice science teachers

School Science and Mathematics, EarlyView.
Abstract VR environments offer opportunities for novel science learning experiences. This article discusses how we integrated virtual reality experiences with preservice and inservice science teachers. We explore the affordances of VR for enhancing science education and its potential applications in secondary level classrooms. Specifically, we describe
Alec Bodzin, Robson Araujo‐Junior, Jiayan Zhu   +2 more
wiley   +1 more source

Modelling photospheric magnetoconvection [PDF]

Monthly Notices of the Royal Astronomical Society, 1998
The increasing power of computers makes it possible to model the nonlinear interaction between magnetic fields and convection at the surfaces of solar-type stars in ever greater detail. We present the results of idealized numerical experiments on two-dimensional magnetoconvection in a fully compressible perfect gas.
Blanchflower, S.M., Rucklidge, A.M., Weiss, N.O.   +2 more
openaire   +3 more sources

Spectral Irradiance Observations and Projections for Solar Cycle 25

Earth and Space Science, Volume 13, Issue 4, April 2026.
Abstract The Ozone Monitoring Instrument (OMI) on the Aura satellite makes near‐daily measurements of solar spectral irradiance (SSI) at wavelengths between 265 and 500 nm for instrument calibration purposes. The low degradation and exceptional stability of OMI's calibration during its lifetime facilitates the creation of a new 18‐year OMI Version 7 ...
Matthew T. DeLand, Sergey V. Marchenko, Judith L. Lean, Odele Coddington   +3 more
wiley   +1 more source

Direct Collapse to Supermassive Black Hole Seeds with Radiation Transfer: Cosmological Halos [PDF]

, 2018
We have modeled direct collapse of a primordial gas within dark matter halos in the presence of radiative transfer, in high-resolution zoom-in simulations in a cosmological framework, down to the formation of the photosphere and the central object ...
Ardaneh, Kazem, Begelman, Mitchell C., Luo, Yang, Nagamine, Kentaro, Shlosman, Isaac, Wise, John H.   +5 more
core   +3 more sources

Reconstruction of Two‐Dimensional Magnetohydrodynamic and Hall Magnetohydrodynamic Equilibria in Space Using Physics‐Informed Neural Networks

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 2, April 2026.
Abstract We present a novel data analysis technique based on physics‐informed neural networks (PINNs) to reconstruct two‐dimensional (2D) magnetohydrodynamic (MHD) and Hall MHD equilibria in a space plasma from in situ spacecraft measurements. Our method incorporates the steady‐state MHD or Hall MHD equations—a set of partial differential equations ...
Hiroshi Hasegawa, Eunjin Choi, Kyoung‐Joo Hwang, Kyunghwan Dokgo   +3 more
wiley   +1 more source

A Cosmological Fireball with 16% Gamma-Ray Radiative Efficiency

The Astrophysical Journal Letters, 2023
Gamma-ray bursts (GRBs) are the most powerful explosions in the universe. How efficiently the jet converts its energy to radiation is a long-standing problem, which is poorly constrained.
Liang Li, Yu Wang, Felix Ryde, Asaf Pe’er, Bing Zhang, Sylvain Guiriec, Alberto J. Castro-Tirado, D. Alexander Kann, Magnus Axelsson, Kim Page, Péter Veres, P. N. Bhat   +11 more
doaj   +1 more source