Results 81 to 90 of about 1,568 (212)

Investigating the role of opacity in reconciling the Standard Solar Model and Helioseismology [PDF]

, 2023
openOver the last 20 years, advances in determining the chemical composition of the Sun have adversely affected the agreement between Standard Solar Models (SSMs) and helioseismology, to the point where SSMs can no longer be made to agree with ...
MANTOVANI, DANIELE
core  

Helioseismology with Solar Orbiter

, 2014
The Solar Orbiter mission, to be launched in July 2017, will carry a suite of remote sensing and in-situ instruments, including the Polarimetric and Helioseismic Imager (PHI).
Appourchaux, Thierry, Gizon, Laurent, Schou, Jesper, Löptien, Björn, Hill, Frank, Hirzberger, Johann, Birch, Aaron C., Blanco Rodríguez, Julián, Dominguez-Tagle, Carlos, Solanki, Sami K., Cally, Paul S., Scherrer, Philip H., Gandorfer, Achim, Rodríguez, J., Scherrer, P., Schou, J., Birch, A., Hirzberger, J., Appourchaux, T., Gandorfer, A., Löptien, B., Solanki, S., Cally, P., Hill, F., Dominguez-Tagle, C., Gizon, L.   +25 more
core   +1 more source

Time-Distance Helioseismology: Noise Estimation

, 2004
As in global helioseismology, the dominant source of noise in time-distance helioseismology measurements is realization noise due to the stochastic nature of the excitation mechanism of solar oscillations.
Gizon, Laurent, A. C. Birch, L. Gizon, Birch, A. C.   +3 more
core   +1 more source

Probing sunspots with two-skip time–distance helioseismology [PDF]

, 2018
Context. Previous helioseismology of sunspots has been sensitive to both the structural and magnetic aspects of sunspot structure.Aims. We aim to develop a technique that is insensitive to the magnetic component so the two aspects can be more readily ...
Gizon, Laurent, Paul S. Cally, Przybylski, D., Cally, P., Laurent Gizon, Duvall, T., Cally, Paul Stuart, Thomas L. Duvall, Damien Przybylski, Duvall Jr, Thomas L, Nagashima, K., Gizon, L., Duvall, Thomas L., Przybylski, Damien, Kaori Nagashima, Laurent, Gizon Dr.,, Cally, Paul S., Nagashima, Kaori   +17 more
core   +1 more source

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

Removal of Active Region Inflows Reveals a Weak Solar Cycle Scale Trend in the Near-surface Meridional Flow

The Astrophysical Journal, 2023
Using time–distance local helioseismology flow maps within 1 Mm of the solar photosphere, we detect inflows toward activity belts that contribute to solar-cycle scale variations in the near-surface meridional flow. These inflows stretch out as far as 30°
Sushant S. Mahajan, Xudong Sun, Junwei Zhao   +2 more
doaj   +1 more source

Helioseismology: Observations and space missions [PDF]

, 2015
Chapter 2 of the book Extraterrestrial Seismology, 16 pages, 5 figures; doi:10.1017/CBO9781107300668 ...
P. L. Pallé, T. Appourchaux, J. Christensen-Dalsgaard, R. A. García   +3 more
openaire   +4 more sources

Global Helioseismology

Bulletin de la Société Royale des Sciences de Liège, 2020
Helioseismology is one of the most successful fields of astrophysics. The observation and character-ization of solar oscillation has allowed solar seismologists to study the internal structure and dynamics of the Sun with unprecedented thoroughness. Ground-based networks and dedicated space missions have delivered data of exquisite quality, enabling ...
openaire   +4 more sources

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

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