Results 21 to 30 of about 6,507 (247)
Journal of Geophysical Research: Space Physics, Volume 128, Issue 12, December 2023., 2023 Abstract We propose a fully automated system to detect, aggregate, and classify sunspot groups according to the McIntosh scheme using ground‐based white light (WL) observations from the USET facility located at the Royal Observatory of Belgium. The sunspot detection uses a Convolutional Neural Network (CNN), trained from segmentation maps obtained with
Niels Sayez +4 more
wiley +1 more source
Frontiers in Astronomy and Space Sciences, 2023 We have on hand some 25 years of nearly uninterrupted high-quality and high-cadence global helioseismic data. The Global Oscillations Network Group (GONG) project has been producing science quality data since 1995, the Michelson Doppler Imager (MDI ...
Sylvain G. Korzennik
doaj +1 more source
Thermodynamic and transport properties of plasmas: Low‐density benchmarks
Contributions to Plasma Physics, Volume 63, Issue 9-10, October-November 2023., 2023 Abstract Physical properties of plasmas, such as equations of state (EoS) and transport coefficients, are expressed in terms of correlation functions, which can be calculated using various approaches (analytical theory and numerical simulations). The method of Green's functions provides benchmark values for these properties in the low‐density limit ...
G. Röpke
wiley +1 more source
SANS: Publicly Available Daily Multi‐Scale Seismic Ambient Noise Source Maps
Journal of Geophysical Research: Solid Earth, Volume 128, Issue 1, January 2023., 2023 Abstract Seismic ambient noise sources have received increased attention recently, creating new possibilities to study the Earth's subsurface and the atmosphere‐ocean‐solid Earth coupling. In efforts to locate such noise sources using nonlinear finite‐frequency inversions, methodological developments such as pre‐computed wavefields and spatially ...
Jonas K. H. Igel +2 more
wiley +1 more source
The future of Genesis science. [PDF]
Meteorit Planet Sci, 2019 Abstract Solar abundances are important to planetary science since the prevalent model assumes that the composition of the solar photosphere is that of the solar nebula from which planetary materials formed. Thus, solar abundances are a baseline for planetary science.
Burnett DS, Jurewicz AJG, Woolum DS.
europepmc +2 more sources
Space Weather, Volume 20, Issue 3, March 2022., 2022 Abstract In the past decade, significant efforts have been made in developing physics‐based solar wind and coronal mass ejection (CME) models, which have been or are being transferred to national centers (e.g., SWPC, Community Coordinated Modeling Center) to enable space weather predictive capability.
Meng Jin +2 more
wiley +1 more source
A Multicomponent Magnetic Proxy for Solar Activity
Space Weather, Volume 19, Issue 12, December 2021., 2021 Abstract We present a new, multicomponent magnetic proxy for solar activity derived from full disk magnetograms that can be used in the specification and forecasting of the Sun’s radiative output. To compute this proxy we project Carrington maps, such as the synchronic Carrington maps computed with the Advective Flux Transport (AFT) surface flux ...
Harry P. Warren +2 more
wiley +1 more source
A Multi‐Purpose Heliophysics L4 Mission
Space Weather, Volume 19, Issue 9, September 2021., 2021 Abstract The Earth‐Sun Lagrangian point 4 is a meta‐stable location at 1 AU from the Sun, 60° ahead of Earth's orbit. It has an uninterrupted view of the solar photosphere centered on W60, the Earth's nominal magnetic field connection to the Sun. Such a mission on its own would serve as a solar remote sensing observatory that would oversee the entire ...
A. Posner +15 more
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R2O2R Improvements Identified by United States Space Weather Forecasters
Space Weather, Volume 19, Issue 6, June 2021., 2021 Abstract A communication deficit exists between the space weather research and forecast communities in the research‐to‐operations‐to‐research (R2O2R) pipeline. No formal, citable space exists for forecasters to communicate needs and lessons learned to the research community (O2R).
E. C. Butler, J. M. Keller
wiley +1 more source
Physics Today, 1995 What powers the Sun? Why does it have spots? How long will it sustain life on Earth? Efforts to answer these questions about the astrophysical object that is of greatest importance to humanity have produced many advances in physics and helped lay the main foundations of astrophysics. The three questions, however, remain to be answered. For example, the
openaire +2 more sources