Results 71 to 80 of about 173,010 (211)

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

Novel peptides with calcium‐binding capacity from antler bone hydrolysate, its bioactivity on MC3T3‐E1 cells, and the possible chelating mode

Food Science &Nutrition, Volume 12, Issue 11, Page 9069-9084, November 2024.
This study identified that antler bone peptide‐calcium chelate promotes MC3T3‐E1 cell differentiation and mineralization. Two novel calcium‐chelating peptides were identified from antler bone hydrolysate with high chelation rates. Oxygen and nitrogen in the peptides' carboxyl and amino groups are involved in calcium binding, with a preference for ...
Zhaoguo Wang, Xiaorui Zhai, Xingyu Xiao, Peijun Xia, Xi Chen, Yi Li, Linlin Hao, Yining Zhang   +7 more
wiley   +1 more source

Transition of the Sun to a Regime of High Activity: Implications for the Earth Climate and Role of Atmospheric Chemistry

Journal of Geophysical Research: Atmospheres, Volume 129, Issue 15, 16 August 2024.
Abstract It was recently suggested that the Sun could switch to a high‐activity regime which would lead to a rise of ultraviolet radiation with an amplitude of about four times larger than the amplitude of an average solar activity cycle and a simultaneous drop in total solar irradiance.
Anna V. Shapiro, Tatiana A. Egorova, Alexander I. Shapiro, Pavle Arsenovic, Eugene V. Rozanov, Laurent Gizon   +5 more
wiley   +1 more source

Investigating the Temperature Sensitivity of UV Line Ratios in the 280 nm Region of Solar-like Stars

The Astrophysical Journal
Stellar UV spectra are fundamental diagnostics of physical and magnetic properties of stars. For instance, lines like Mg ii at 280 nm serve as valuable indicators of stellar activity, providing insights into the activity levels of Sun-like stars and ...
Valentina Penza, Serena Criscuoli, Raffaele Reda, Luca Bertello, Giuseppe Bono, Dario Del Moro, Valentina D’Orazi, Luca Giovannelli, Giuseppina Nigro, Francesco Berrilli   +9 more
doaj   +1 more source

China's Ground‐Based Space Environment Monitoring Network—Chinese Meridian Project (CMP)

Space Weather, Volume 22, Issue 7, July 2024.
Abstract Monitoring and investigation of the solar‐terrestrial space environment is a huge challenge for humans in space age. To this end, China has established the Ground‐based Space Environment Monitoring Network, namely Chinese Meridian Project (CMP).
Chi Wang, Jiyao Xu, Zhiqing Chen, Hui Li, Xueshang Feng, Zhaohui Huang, Jiangyan Wang   +6 more
wiley   +1 more source

Double-edged Sword: The Influence of Tidal Interaction on Stellar Activity in Binaries

The Astrophysical Journal
Using the LAMOST DR7 low-resolution spectra, we carried out a systematic study of stellar chromospheric activity in both single and binary stars. We constructed a binary sample and a single-star sample, mainly using the binary belt and the main sequence ...
Yuedan Ding, Shidi Zhang, Henggeng Han, Wenyuan Cui, Song Wang, Min Fang, Yawei Gao   +6 more
doaj   +1 more source

Estimation of Spectral Solar Irradiance in the Ecliptic Plane Using Synthetic Solar Surface Magnetograms

Journal of Geophysical Research: Space Physics, Volume 129, Issue 5, May 2024.
Abstract The primary external energy input to planetary atmospheres comes from solar radiation. Accurate estimates of solar irradiance are needed in order to understand atmospheric conditions at other planets. Many studies have interpolated Earth‐based irradiance measurements at other planets, disregarding the evolution of solar features, which are ...
I. de Oliveira, K. Sowmya, N.‐E. Nèmec, A. I. Shapiro   +3 more
wiley   +1 more source

X-Shooter spectroscopy of young stellar objects in Lupus. Atmospheric parameters, membership and activity diagnostics [PDF]

, 2017
A homogeneous determination of basic stellar parameters of young stellar object (YSO) candidates is needed to confirm their evolutionary stage, membership to star forming regions (SFRs), and to get reliable values of the quantities related to ...
Alcalà, J. M., Antoniucci, S., Biazzo, K., Covino, E., Frasca, A., Manara, C. F., Stelzer, B.   +6 more
core   +2 more sources

Nowcasting Solar EUV Irradiance With Photospheric Magnetic Fields and the Mg II Index

Space Weather, Volume 22, Issue 4, April 2024.
Abstract A new method to nowcast spectral irradiance in extreme ultraviolet (EUV) and far ultraviolet (FUV) bands is presented here, utilizing only solar photospheric magnetograms and the Mg II index (i.e., the core‐to‐wing ratio). The EUV and FUV modeling outlined here is a direct extension of the SIFT (Solar Indices Forecasting Tool) model, based on ...
Kara L. Kniezewski, Samuel J. Schonfeld, Carl J. Henney   +2 more
wiley   +1 more source

Interesting Features in the Combined GALEX and Sloan Color Diagrams of Solar-like Galactic Populations

, 2014
We report on intriguing photometric properties of Galactic stars observed in the GALEX satellite's far-UV and near-UV bandbasses as well as from the SDSS survey and the Kepler Input Catalog.
Bianchi, Luciana, Shiao, Bernard, Smith, Myron   +2 more
core   +1 more source