Results 71 to 80 of about 3,487 (215)

Relative Contributions of Lower‐Atmosphere Tidal and Solar‐Magnetospheric Forcings to the Day‐to‐Day Variability of F‐Region Electron Density

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract We use Thermosphere Ionosphere Electrodynamics General Circulation Model simulations nudged to realistic tides and their statistical day‐to‐day variabilities (DTDVs), derived from Michelson Interferometer for Global High‐Resolution Thermospheric Imaging/Ionospheric Connection Explorer observations, to estimate the relative importance of tidal ...
Xian Lu, Jens Oberheide, Deepali Aggarwal   +2 more
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

Constraining the outer boundary condition for the Babcock-Leighton dynamo models

Astronomy & Astrophysics
Context. The evolution of the Sun’s large-scale surface magnetic field is well captured by surface flux transport models, which can therefore provide a natural constraint on the outer boundary condition (BC) of Babcock–Leighton (BL) dynamo models.
Luo Yukun, Jiang Jie, Li Binghang, Zhang Zebin, Wang Ruihui   +4 more
doaj   +1 more source

Detection of Equatorial Plasma Bubbles Using the COSMIC‐2 Rate of TEC Index

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Equatorial plasma bubbles (EPBs) are large‐scale plasma depletion structures that can disrupt Global Navigation Satellite Systems (GNSS) and other space‐based technologies. Several instruments have been employed to study EPB dynamics, with Total Electron Content (TEC) and Rate of TEC change Index (ROTI) data standing out as valuable parameters
Ana L. Christovam, Fabricio S. Prol, Marcio T. A. H. Muella   +2 more
wiley   +1 more source

Cio-cio-san no Yūutsu: memoirs of magnetogenesis and Turbulent Dynamo Theory

, 2013
The origins of cosmic magnetic fields are not as yet well understood. In this dissertation we investigate, via direct numerical simulation, the temporal evolution and behaviour of magnetic fields that are generated from absolute zero initial conditions ...
Adams, Patrick
core  

An Insight into the Solar Dynamo Theory

, 2017
The Sun manifests its magnetic field in form of the solar activities, being observed on the surface of the Sun. The dynamo action is responsible for the evolution of the magnetic field in the Sun.
Kumar, Mukul, Babu Ram Tiwari, Mukul Kumar, Tiwari, Babu Ram   +3 more
core   +1 more source

Doppler images and the underlying dynamo [PDF]

, 2015
Context. The (Zeeman-)Doppler imaging studies of solar-type stars very often reveal large high-latitude spots. This also includes F stars that possess relatively shallow convection zones, indicating that the dynamo operating in these stars differs from ...
S. C. Marsden, M. Küker, Waite, I. A., I. V. Ilyin, Strassmeier, K. G., Jarvinen, S. P., T. Hackman, Kuker, M., I. A. Waite, Hackman, T., K. G. Strassmeier, Ilyin, I. V., S. P. Järvinen, Arlt, R., Marsden, S. C., Berdyugina, S. V., R. Arlt, S. V. Berdyugina   +17 more
core   +1 more source

Can stochastic resonance explain the amplification of planetary tidal forcing?

, 2019
Repeated Grand Minima revealed by proxies of solar activity suggest that the Sun alternates between two stable states, a quiescent and an active one. If the intrinsic noise of the solar dynamo allows for a frequent switching between these stable states ...
Albert, Carlo, Ulzega, Simone
core   +1 more source

Constraining Electron‐Impact Ionization of O2 Through UV Aurora Observations at Ganymede

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract While photoionization rates of Ganymede's O2 ${\mathrm{O}}_{2}$ dominated atmosphere are well constrained, the contribution of electron‐impact ionization is rather uncertain. Previous quantitative estimates have relied on assumptions about densities and energy distributions of precipitating electrons, or on rare spacecraft measurements that ...
Stefan Duling, Joachim Saur, Darrell Strobel, Philippa Molyneux, Jamey R. Szalay, Thomas K. Greathouse   +5 more
wiley   +1 more source

The solar tachocline: a self-consistent model of magnetic confinement

, 2011
In this dissertation we consider the dynamics of the solar interior, with particular focus on angular momentum balance and magnetic field confinement within the tachocline. In Part I we review current knowledge of the Sun's rotation.

core   +1 more source