Results 81 to 90 of about 5,529 (192)

New Results on Standard Solar Models

, 2009
We describe the current status of solar modelling and focus on the problems originated with the introduction of solar abundance determinations with low CNO abundance values.
A. Weiss, Aldo M. Serenelli, B. Aharmim, B. Aharmim, C. Allende Prieto, C. Arpesella, C. Fröhlich, C.H. Lin, F. Delahaye, H.M. Antia, H.M. Antia, I.W. Roxburgh, J. Guzik, J.A. Guzik, J.C. Christensen-Dalsgaard, J.C. Christensen-Dalsgaard, J.C. Christensen-Dalsgaard, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.W. Ferguson, M. Asplund, M. Castro, N. Grevesse, N. Grevesse, N.R. Badnell, Q.R. Ahmad, S. Basu, S. Basu, S. Basu, S. Turck-Chiéze, W.C. Haxton, W.J. Chaplin   +37 more
core   +1 more source

Exploring the Connection between Helioseismic Travel Time Anomalies and the Emergence of Large Active Regions during Solar Cycle 24

The Astrophysical Journal, 2023
We investigate deviations in the mean phase travel time of acoustic waves preceding the emergence of 46 large active regions observed by the Helioseismic and Magnetic Imager.
John T. Stefan, Alexander G. Kosovichev
doaj   +1 more source

Investigating Variations in Solar Differential Rotation by Helioseismology

The Astrophysical Journal
Helioseismic signatures of dynamo waves have recently been discovered in variations of the solar differential rotation, offering valuable insights into the type of dynamo mechanism operating in the solar convection zone. To characterize these variations,
Krishnendu Mandal, Alexander G. Kosovichev, Valery V. Pipin, Sylvain G. Korzennik   +3 more
doaj   +1 more source

A Broad Set of Solar and Cosmochemical Data Indicates High C-N-O Abundances for the Solar System

The Astrophysical Journal
We examine the role of refractory organics as a major C carrier in the outer protosolar nebula and its implications for the compositions of large Kuiper Belt objects (KBOs) and CI chondrites.
Ngoc Truong, Christopher R. Glein, Jonathan I. Lunine   +2 more
doaj   +1 more source

Speed of Meridional Flows and Magnetic Flux Transport on the Sun

, 2007
We use the magnetic butterfly diagram to determine the speed of the magnetic flux transport on the solar surface towards the poles. The manifestation of the flux transport is clearly visible as elongated structures extended from the sunspot belt to the ...
Kosovichev, A. G., Svanda, M., Zhao, J.
core   +1 more source

Addressing Known Challenges in Solar Flare Forecasting I: Limb‐Flare Prediction With a 4π Full‐Heliosphere Framework

Space Weather
A demonstrated failure mode for operational solar flare forecasting is the inability to forecast flares that occur near, or just beyond, the solar limb.
K. D. Leka, Eric L. Wagner, Lisa Upton, Bibhuti Kumar Jha, Kiran Jain, Sara Petty   +5 more
doaj   +1 more source

Seismic Sounding of Convection in the Sun

, 2015
Our Sun, primarily composed of ionized hydrogen and helium, has a surface temperature of 5777~K and a radius $R_\odot \approx 696,000$ km. In the outer $R_\odot/3$, energy transport is accomplished primarily by convection.
Gizon, Laurent, Hanasoge, Shravan, Sreenivasan, Katepalli R.   +2 more
core   +1 more source

Non-linear helioseismology [PDF]

Monthly Notices of the Royal Astronomical Society, 1984
Les equations differentielles de modes d'oscillations adiabatiques radiaux couples non lineairement sont integrees pour trois modeles solaires detailles. Dans toutes les experiences le spectre de puissance resultant du deplacement de surface montre un pic a une longue periode P L excedant 2 ...
J. Perdang, S. Blacher
openaire   +1 more source

Helioseismic Signature of Parker Fragmentation of Magnetic Flux beneath Sunspot Photospheres

The Astrophysical Journal Letters
Standard local helioseismic diagnostics of large sunspots show the signature of anomalously strong compact scatterers of p -modes within about 1 Mm beneath their photospheres.
Elena G. Broock, Angel Mart Cifuentes, Alina-Catalina Donea, Charles Lindsey   +3 more
doaj   +1 more source

A Core-sensitive Mixed f/g-mode of the Sun Predicted by Wave Topology and Hydrodynamical Simulation

The Astrophysical Journal Letters
Helioseismology has revolutionized our understanding of the Sun by analyzing its global oscillation modes. However, the solar core remains elusive, limiting a full understanding of its evolution.
Arthur Le Saux, Armand Leclerc, Guillaume Laibe, Pierre Delplace, Antoine Venaille   +4 more
doaj   +1 more source