Results 61 to 70 of about 1,264 (214)
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. +49 more
doaj +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 +3 more
wiley +1 more source
Time-Distance Helioseismology: Noise Estimation [PDF]
, 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 +3 more
core +1 more source
Observational Evidence of Shallow Origins for the Magnetic Fields of Solar Cycles
Frontiers in Astronomy and Space Sciences, 2018 Observational evidence for the origin of active region magnetic fields has been sought from published information on extended solar cycles, statistical distributions of active regions and ephemeral regions, helioseismology results, positional ...
Sara F. Martin
doaj +1 more source
Journal of Geophysical Research: Space Physics, Volume 129, Issue 5, May 2024.Abstract The primary external energy input to planetary atmospheres comes from solar radiation. Accurate estimates of solar irradiance are needed in order to understand atmospheric conditions at other planets. Many studies have interpolated Earth‐based irradiance measurements at other planets, disregarding the evolution of solar features, which are ...
I. de Oliveira +3 more
wiley +1 more source
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
Assessment of DKIST/VTF capabilities for the detection of local acoustic source wavefronts
Frontiers in Astronomy and Space SciencesIntroductionRecent studies have demonstrated that temporal filtering can successfully identify local acoustic source wavefronts in radiative magnetohydrodynamic simulations of the solar photosphere.
Corinne Morrell +6 more
doaj +1 more source
Global helioseismology (WP4.1): From the Sun to the stars & solar analogs
EPJ Web of Conferences, 2017 Sun-as-a star observations put our star as a reference for stellar observations. Here, I review the activities in which the SPACEINN global seismology team (Working Package WP4.1) has worked during the past 3 years. In particular, we will explain the new
García Rafael A.
doaj +1 more source
Time-Distance Helioseismology [PDF]
, 2010 Time-distance helioseismology is a method of ambient noise imaging using the solar oscillations. The basic realization that led to time-distance helioseismology was that the temporal cross correlation of the signals at two 'surface' (or photospheric ...
Duvall, Thomas L., Jr.
core +1 more source
Determining solar abundances using helioseismology [PDF]
, 2006 The recent downward revision of solar photospheric abundances of oxygen and other heavy elements has resulted in serious discrepancies between solar models and solar structure as determined through helioseismology.
Basu, Sarbani, Antia, H. M.
core +1 more source