Results 61 to 70 of about 1,260 (214)

Towards inertial-mode helioseismology: Direct sensing of solar rotation at 75° latitude and 0.8 R⊙

Astronomy & Astrophysics
Context. Because solar global inertial modes are highly sensitive to differential rotation, they may provide new diagnostics of internal rotation at high latitudes, where acoustic-mode helioseismology provides only weak constraints. Aims.
Dey Prithwitosh, Gizon Laurent, Bekki Yuto   +2 more
doaj   +1 more source

A Review of Space Helioseismology [PDF]

Symposium - International Astronomical Union, 1997
The helioseismology started in 1960 with the discovery of oscillations of the velocity field on the solar surface by Leighton, 1960. The mechanism producing these oscillations remained unexplained for the next ten years until Ulrich, 1970, and independently Leibacher and Stein, 1971, demonstrated that acoustic waves trapped beneath the solar surface ...
openaire   +1 more source

Stellar Physics and General Relativity

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT The general theory of relativity is currently established as the most precise theory of gravity supported by observations, and its application is diverse ranging from astronomy to cosmology, while its application to astrophysics has been restricted only to compact stars due to the assumption that the Newtonian approximation is sufficient for ...
Shuichi Yokoyama
wiley   +1 more source

Helioseismology with long-range dark matter-baryon interactions [PDF]

, 2014
Assuming the existence of a primordial asymmetry in the dark sector, we study how long-range dark matter (DM)-baryon interactions, induced by the kinetic mixing of a new U(1) gauge boson and a photon, affect the evolution of the Sun and, in turn, the ...
Lopes I., Panci P., Silk J.
core   +2 more sources

Recent Developments in Degenerate Higher Order Scalar Tensor Theories

Annalen der Physik, Volume 537, Issue 2, February 2025.
Degenerate Higher Order Scalar Tensor theories are reviewed, together with their applications in cosmology and astrophysics. These theories have been applied to build models of the early universe, in the description of the late‐time cosmic acceleration, as well as in astrophysics, including black hole physics. They have the potential to provide answers
Andrei Lazanu
wiley   +1 more source

Coronal and heliospheric magnetic flux circulation and its relation to open solar flux evolution

Journal of Geophysical Research: Space Physics, Volume 122, Issue 6, Page 5870-5894, June 2017., 2017
Abstract Solar cycle 24 is notable for three features that can be found in previous cycles but which have been unusually prominent: (1) sunspot activity was considerably greater in the northern/southern hemisphere during the rising/declining phase; (2) accumulation of open solar flux (OSF) during the rising phase was modest, but rapid in the early ...
Mike Lockwood, Mathew J. Owens, Suzanne M. Imber, Matthew K. James, Emma J. Bunce, Timothy K. Yeoman   +5 more
wiley   +1 more source

Helioseismology, solar models and solar neutrinos

, 1999
We review recent advances concerning helioseismology, solar models and solar neutrinos. Particularly we shall address the following points: i) helioseismic tests of recent SSMs; ii)the accuracy of the helioseismic determination of the sound speed near ...
Fiorentini G., Ricci B., FIORENTINI, Giovanni, RICCI, Barbara   +3 more
core   +1 more source

Extreme Space Weather Events of the Past 30 Years: Preparation for Data From Mission Vigil

Earth and Space Science, Volume 12, Issue 2, February 2025.
Abstract Extreme Space Weather events can negatively affect ground‐based infrastructure and satellite communications. European Space Agency plans to launch a new operational mission, Vigil, to monitor space weather activity and provide timely warnings about immediate danger.
Adam Majirský, Šimon Mackovjak, Silvia Kostárová, Samuel Amrich   +3 more
wiley   +1 more source

Direct assessment of SDO/HMI helioseismology of active regions on the Sun’s far side using SO/PHI magnetograms

Astronomy & Astrophysics, 2023
Context. Earth-side observations of solar p modes can be used to image and monitor magnetic activity on the Sun’s far side. In this work, we use magnetograms of the far side obtained by the Polarimetric and Helioseismic Imager (PHI) on board Solar ...
Yang D., Gizon L., Barucq H., Hirzberger J., Orozco Suárez D., Albert K., Albelo Jorge N., Appourchaux T., Alvarez-Herrero A., Blanco Rodríguez J., Gandorfer A., Germerott D., Guerrero L., Gutierrez-Marques P., Kahil F., Kolleck M., Solanki S. K., del Toro Iniesta J. C., Volkmer R., Woch J., Pérez-Grande I., Sanchis Kilders E., Balaguer Jiménez M., Bellot Rubio L. R., Calchetti D., Carmona M., Deutsch W., Feller A., Fernandez-Rico G., Fernández-Medina A., García Parejo P., Gasent Blesa J. L., Grauf B., Heerlein K., Korpi-Lagg A., Lange T., López Jiménez A., Maue T., Meller R., Moreno Vacas A., Müller R., Nakai E., Schmidt W., Schou J., Schühle U., Sinjan J., Staub J., Strecker H., Torralbo I., Valori G.   +49 more
doaj   +1 more source

Helioseismology

Astrophysics and Space Sciences Transactions, 2008
Helioseismology, the study of solar oscillations, has proved to be an extremely powerful tool for the investigation of the internal structure and dynamics of the Sun. Here I will review the present status of helioseismic studies and comment on recent results and on prospects for future investigations to solve the most discussed open questions ...
openaire   +3 more sources