Results 81 to 90 of about 6,507 (247)

Analysis of Solar Surface Oscillations and Energy Transport with Bispectral Electronic Thermostatistics

The Astrophysical Journal
The ubiquitous 5 minute solar p -mode oscillations, excited at the photosphere, play a crucial role in driving various coronal instabilities and mediating upward energy transport. These modes are strongly influenced by nonthermal electron populations. To
Souvik Das, Pralay Kumar Karmakar
doaj   +1 more source

Observed Power and Frequency Variations of Solar Rossby Waves with Solar Cycles

The Astrophysical Journal Letters, 2023
Several recent studies utilizing different helioseismic methods have confirmed the presence of large-scale vorticity waves known as solar Rossby waves within the Sun.
M. Waidele, Junwei Zhao
doaj   +1 more source

Neutrino fluxes from CNO cycle in the Sun in the non stationary case with mixing

, 2009
The computational analyses is presented of the non stationary case with mixing of the solar model when the neutrino flux $F_{13}$ from the decay of $^{13}N$ is higher than a standard solar model predictsComment: 6 pages ...
A Kopylov, A. Kopylov, Borexino collaboration, C. Peña-Garay, F. Delahaye, Homestake collaboration, J.N. Bahcall, J.N. Bahcall, R. Martin, SAGE collaboration, V Petukhov, W.J. Chaplin .   +11 more
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Space-time segmentation method for study of the vertical structure and evolution of solar supergranulation from data provided by local helioseismology

, 2010
Solar supergranulation remains a mystery in spite of decades of intensive studies. Most of the papers about supergranulation deal with its surface properties.
Beck, Birch, Birch, Del Moro, DeRosa, Duvall, Duvall, Gierasch, Gizon, Hart, Hirzberger, Jackiewicz, Jensen, Kosovichev, Leighton, M. Klvaňa, M. Švanda, R. Žlebčík, Rieutord, Simon, Zhao, Švanda   +21 more
core   +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
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Can Proton Beam Heating Flare Models Explain Sunquakes?

The Astrophysical Journal, 2023
Solar Dynamics Observatory (SDO)/Helioseismic and Magnetic Imager (HMI) observations reveal a class of solar flares with substantial energy and momentum impacts in the photosphere, concurrent with white-light emission and helioseismic responses, known as
Viacheslav M. Sadykov, John T. Stefan, Alexander G. Kosovichev, Andrey M. Stejko, Adam F. Kowalski, Joel C. Allred, Graham S. Kerr   +6 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

Helioseismology and the solar age [PDF]

, 1998
The problem of measuring the solar age by means of helioseismology hasbeen recently revisited by Guenther & Demarque (1997) and by Weiss & Schlattl (1998). Different best values for $t_{\rm seis}$ and different assessment of the uncertainty resulted from
Dziembowski, W. A., Fiorentini, G., Ricci, B., Sienkiewicz, R.   +3 more
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Influence of Non-Uniform Distribution of Acoustic Wavefield Strength on Time-Distance Helioseismology Measurements

, 2008
By analyzing numerically simulated solar oscillation data, we study the influence of non-uniform distribution of acoustic wave amplitude, acoustic source strength, and perturbations of the sound speed on the shifts of acoustic travel times measured by ...
Kosovichev, Alexander G., Parchevsky, Konstantin V., Zhao, Junwei   +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