Results 61 to 70 of about 972,333 (200)

Where is the solar dynamo? [PDF]

Journal of Physics: Conference Series, 2013
In this paper I review results from recent global magnetohydrodynamical numerical simulations of solar convection, as a springboard to address the question "Where is the solar dynamo". I first describe and contrast similarities and differences in the large-scale flows and magnetic fields such simulations can produce, with emphasis on polarity reversals
openaire   +1 more source

Automated Mineral Identification and Rock‐Type Classification of Lunar Mare Basalts Using SEM Images

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 4, August 2026.
Abstract We present an automated system for identifying minerals and classifying rock types in Apollo lunar mare basalts using scanning electron microscopy (SEM) imagery. Mineral segmentation is based on a U‐Net architecture, supplemented by two scale‐aware models designed to incorporate pixel size information.
Ji‐In Jung, Sonia M. Tikoo, Jaehong Chung, Claire I. O. Nichols   +3 more
wiley   +1 more source

Massive Rocky Planets May Suppress Deep Melting

AGU Advances, Volume 7, Issue 4, August 2026.
Abstract Melting properties of silicates are critical to understanding the thermal evolution of rocky planetary interiors. In the deep mantles of massive rocky planets, post‐post‐spinel Mg2SiO4 ${\text{Mg}}_{2}{\text{SiO}}_{4}$ is potentially one of the most abundant mineral phases, yet its melting behavior remains unconstrained. Here, we determine the
Donghao Zheng, Yihang Peng, Jie Deng
wiley   +1 more source

Transition from axi- to nonaxisymmetric dynamo modes in spherical convection models of solar-like stars [PDF]

, 2018
Context. Both dynamo theory and observations of stellar large-scale magnetic fields suggest a change from nearly axisymmetric configurations at solar rotation rates to nonaxisymmetric configurations for rapid rotation. Aims.
Cole-Kodikara, E., J. J. Lehtinen, Brandenburg, Axel,, Olspert, N., Lehtinen, J. J.,, Viviani, Mariangela, Lehtinen, Jyri J., Lehtinen, J. J., Warnecke, J., M. Viviani, Käpylä, P. J., Viviani, M.,, Käpylä, M., Warnecke, J.,, Käpylä, Petri J.,, Olspert, Nigul, Cole-Kodikara, E. M., Kaepylae, P. J.,, Lehtinen, J., M. J. Käpylä, Cole-Kodikara, Elizabeth M., Käpylä, Maarit J., Brandenburg, A., Cole-Kodikara, E. M.,, A. Brandenburg, Viviani, M., Olspert, N.,, E. M. Cole-Kodikara, Käpylä, P., Käpylä, P. J.,, Brandenburg, Axel, P. J. Käpylä, Käpylä, Petri J., Warnecke, Jörn, Käpylä, M. J., J. Warnecke, N. Olspert   +36 more
core   +1 more source

A Contrasting TEC Behavior Over the Low‐Latitude Post‐Midnight Sector During Recovery Phases of May and October 2024 Storms: Possible Role of PPEF, DDEF, and O/N2

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The present study reports on the variability of the post‐midnight ionosphere over the low‐latitude sector during the recovery phases of the May and October 2024 storms. Multi‐instrument observations, comprising global navigation satellite system total electron content (TEC), F‐layer peak height, electron density profiles, and column O/N2 ...
Rahul Rathi, Akash Kumar, Alok Kumar Ranjan, Dipjyoti Patgiri, Satarupa Chakrabarti, Lot Ram   +5 more
wiley   +1 more source

The effect of colour on the thermal performance of building integrated solar collectors [PDF]

, 2010
The use of solar collectors with coloured absorbers for water heating is an area of particular interest when considering their integration with buildings.
Carson, James K., Duke, Mike, Anderson, Timothy Nicholas   +2 more
core   +1 more source

Connecting mean-field theory with dynamo simulations

Living Reviews in Solar Physics
Mean-field dynamo theory, describing the evolution of large-scale magnetic fields, has been the mainstay of theoretical interpretation of magnetism in astrophysical objects such as the Sun for several decades.
Petri J. Käpylä
doaj   +1 more source

Longitudinal Variation of Ionospheric Irregularities and Response of the Ionosphere During 10–13 May and 10–13 October 2024 Geomagnetic Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We examine the response of the ionosphere to the 10–13 May 2024 and 10–13 October 2024 geomagnetic storms, the two recent great geomagnetic storms of solar cycle 25. We identified the occurrence of ionospheric irregularities during the two geomagnetic storms.
Valence Habyarimana, Mark B. Moldwin, John Bosco Habarulema, Sharon Aol, Jean Claude Uwamahoro, Teshome Dugassa, Daniel Okoh, Solomon Otoo Lomotey   +7 more
wiley   +1 more source

Effect of Lunar Rotation on Antipodal Ejecta Deposition

Journal of Geophysical Research: Planets, Volume 131, Issue 8, August 2026.
Abstract The Moon's crust exhibits strong magnetic anomalies that likely record ancient magnetic fields produced by a core dynamo. Lunar materials have low magnetic susceptibility, but impactor material with high susceptibility may record the Moon's ancient dynamo. Some magnetic anomalies are antipodal to lunar basins and it is hypothesized that impact
S. Wakita, B. C. Johnson
wiley   +1 more source

Toroidal Magnetic Flux Budget in Mean-field Dynamo Model of Solar Cycles 23 and 24

The Astrophysical Journal
We study the toroidal magnetic flux budget of the axisymmetric part of a data-driven 3D mean-field dynamo model of Solar Cycles 23 and 24. The model simulates the global solar dynamo that includes the effects of the formation and evolution of bipolar ...
Valery V. Pipin, Alexander G. Kosovichev
doaj   +1 more source