Results 31 to 40 of about 1,379,332 (142)

STOCHASTIC SEISMIC EMISSION FROM ACOUSTIC GLORIES AND THE QUIET SUN [PDF]

, 2000
. Helioseismic images of multipolar active regions show enhanced seismic emission in 5-mHz oscillations in a halo surrounding the active region called the ‘acoustic glory’. The acoustic glories contain elements that sustain an average seismic emission 50
C. Lindsey, D. C. Braun, A.-C. Donea, A. -c. Donea   +3 more
core   +1 more source

The Complex Nature of Magnetic Element Transport in the Quiet Sun: The Multiscaling Character

, 2021
In recent studies the dynamic properties of small-scale magnetic fields (magnetic elements [MEs]) in the quiet Sun were used to investigate peculiar features of turbulent convection and get insights on the characteristic spatial and temporal scales of ...
Giannattasio, Fabio, Consolini, Giuseppe
core   +1 more source

Inferring depth-dependent plasma motions from surface observations using the DeepVel neural network

Journal of Space Weather and Space Climate, 2021
Coverage of plasma motions is limited to the line-of-sight component at the Sun’s surface. Multiple tracking and inversion methods were developed to infer the transverse motions from observational data.
Tremblay Benoit, Cossette Jean-François, Kazachenko Maria D., Charbonneau Paul, Vincent Alain   +4 more
doaj   +1 more source

Estimating the longitudinal magnetic field in the chromosphere of quiet-Sun magnetic concentrations [PDF]

, 2023
Context. Details of the magnetic field in the quiet-Sun chromosphere are key to our understanding of essential aspects of the solar atmosphere. However, the strength and orientation of this magnetic field have not been thoroughly studied at high spatial ...
M. J. Martínez González, Pozuelo, S. Esteban, Rodríguez, J. de la Cruz, de la Cruz Rodríguez, Jaime,, Bueno, J. Trujillo, J. de la Cruz Rodríguez, S. Esteban Pozuelo, A. Asensio Ramos, J. Trujillo Bueno, Ramos, A. Asensio, González, M. J. Martínez   +10 more
core   +1 more source

Incoherent Solar Radio Emission

Frontiers in Astronomy and Space Sciences, 2020
Incoherent solar radio radiation comes from the free-free, gyroresonance, and gyrosynchrotron emission mechanisms. Free-free is primarily produced from Coulomb collisions between thermal electrons and ions.
Alexander Nindos
doaj   +1 more source

Cosmogenic radionuclides reveal an extreme solar particle storm near a solar minimum 9125 years BP

Nature Communications, 2022
Cosmogenic radionuclides from ice cores and tree rings indicate that an extreme solar proton event has hit Earth about 9200 years ago. Contrary to expectations, the event occurred during a quiet phase of the Sun within the 11 year solar cycle.
Chiara I. Paleari, Florian Mekhaldi, Florian Adolphi, Marcus Christl, Christof Vockenhuber, Philip Gautschi, Jürg Beer, Nicolas Brehm, Tobias Erhardt, Hans-Arno Synal, Lukas Wacker, Frank Wilhelms, Raimund Muscheler   +12 more
doaj   +1 more source

Modulation of Cosmic-Ray Antiprotons in the Heliosphere: Simulations for a Solar Cycle

The Astrophysical Journal, 2023
The precision measurements of galactic cosmic-ray protons from the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics and the Alpha Magnetic Spectrometer are reproduced using a well-established three-dimensional numerical model for ...
O. P. M. Aslam, M. S. Potgieter, Xi Luo, M. D. Ngobeni   +3 more
doaj   +1 more source

Determination of field strengths in the quiet Sun

, 2006
The magnetism in the quiet regions of the solar photosphere carries information on the dynamo processes and its interaction with the convection of the outer layers of the sun.
M. J. Martínez González, Rámirez Vélez, J. C., Martínez González, María Jesús, J. C. Ramírez Vélez, A. López Ariste, Lopez-Ariste, Arturo   +5 more
core   +1 more source

Center-to-limb variations of solar active regions

Astronomy & Astrophysics
Accurate modeling of stellar active regions (ARs) remains a major bottleneck for radial-velocity and transmission-spectroscopy studies aimed at finding Earth-like planets. While much effort has been devoted to AR modeling, their center-to-limb variations
Pietrow A. G. M., Sumra S., Petit dit de la Roche D. J. M., Lößnitz E. J., Denker C., Aßmus M.   +5 more
doaj   +1 more source

Photospheric Swirls in a Quiet-Sun Region

The Astrophysical Journal
Swirl-shaped flow structures have been observed throughout the solar atmosphere, in both emission and absorption, at different altitudes and locations, and are believed to be associated with magnetic structures. However, the distribution patterns of such
Quan Xie, Jiajia Liu, Chris J. Nelson, Robert Erdélyi, Yuming Wang   +4 more
doaj   +1 more source