Results 21 to 30 of about 253 (148)
Our Sun. V. A Bright Young Sun Consistent with Helioseismology and Warm Temperatures on Ancient Earth and Mars [PDF]
The Astrophysical Journal, 2003 LaTeX, 30 pages (including 13 figures); ApJ, in press.
I.‐Juliana Sackmann +1 more
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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
Resonant origin for density fluctuations deep within the Sun: helioseismology and magneto-gravity waves [PDF]
Monthly Notices of the Royal Astronomical Society, 2004 We analyze helioseismic waves near the solar equator in the presence of magnetic fields deep within the solar radiative zone. We find that reasonable magnetic fields can significantly alter the shapes of the wave profiles for helioseismic g-modes. They can do so because the existence of density gradients allows g-modes to resonantly excite Alfven waves,
C. P. Burgess +4 more
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Our Sun. IV. The Standard Model and Helioseismology: Consequences of Uncertainties in Input Physics and in Observed Solar Parameters [PDF]
The Astrophysical Journal, 2003 Helioseismology provides a powerful tool to explore the deep interior of the Sun: for example, the adiabatic sound speed can be inferred with an accuracy of a few parts in 10,000. This has become a serious challenge to theoretical models of the Sun. Therefore, we have undertaken a self-consistent, systematic study of sources of uncertainties in the ...
Arnold I. Boothroyd +1 more
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Seeing the Invisible Sun: Reconstructing Far-Side Magnetograms from Helioseismology
Abstract Understanding and monitoring solar active regions is essential for operational space-weather forecasting and better solar dynamo modeling. This requires comprehensive 360$^\circ$ observations of the Sun. The front-side active regions are observed across multiple wavelengths,however, a critical gap in our knowledge remains due
Amr Hamada +4 more
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Proceedings of the 24th All-Russia Conference on Solar and Solar-Terrestrial Physics, 2020 Central astronomical observatory of RAS (Pulkovo), St. Petersburg, Russia +5 more
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The Astrophysical Journal, 2004 By applying time-distance helioseismology measurements and inversions to Solar and Heliospheric Observatory (SOHO) Michelson Doppler Imager (MDI) dynamics campaign data, we obtain synoptic maps of subsurface plasma-flow fields at a depth of 0-12 Mm for seven solar Carrington rotations, covering the years 1996-2002, from solar-activity minimum to ...
Junwei Zhao, А. Г. Косовичев
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Equatorially trapped Rossby waves in radiative stars
Astronomische Nachrichten, Volume 344, Issue 10, December 2023., 2023 Abstract Observations by recent space missions reported the detection of Rossby waves (r‐modes) in light curves of many stars (mostly A, B, and F spectral types) with outer radiative envelope. This article aims to study the theoretical dynamics of Rossby‐type waves in such stars. Hydrodynamic equations in a rotating frame were split into horizontal and
Mariam Albekioni +4 more
wiley +1 more source
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
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