Results 51 to 60 of about 972,333 (200)
Solar and Stellar Dynamos [PDF]
Proceedings of the International Astronomical Union, 1993 AbstractRecords of the solar magnetic field extend back for millennia, and its surface properties have been observed for centuries, while helioseismology has recently revealed the Sun's internal rotation and the presence of a tachocline. Dynamo theory has developed to explain these observations, first with idealized models based on mean-field ...
openaire +1 more source
Space Weather, Volume 24, Issue 9, September 2026.Abstract Equatorial plasma bubbles (EPBs) are typically nighttime ionospheric irregularities, and their persistence into daytime sectors remains insufficiently understood. Here, we investigate long‐lived EPB‐related plasma depletion structures over the Pacific sector during the recovery phase of the 23–25 April 2023 geomagnetic storm using Formosa ...
Hailun Ye +12 more
wiley +1 more source
Waldmeier law for sunspot cycles: Statistical significance and implications for dynamo
Solar-Terrestrial PhysicsWaldmeier law for the relation between the rise phase duration and amplitude of solar cycles is an indicator for strength of nonlinearity in the solar dynamo.
Kitchatinov Leonid
doaj +1 more source
Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.Abstract The solar quiet (Sq) current and equatorial electrojet are widely known as one of the fundamental currents in ionosphere. Although the Sq‐EEJ current system has been extensively investigated, the manner in which Hall and Pedersen current components collectively organize the system has not been clearly described.
T. Ijuin, H. Jin, A. Yoshikawa
wiley +1 more source
Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.Abstract We investigate the nighttime equatorial ionosphere during the 19 January 2026 geomagnetic storm using Global‐scale Observations of the Limb and Disk OI 135.6 nm observations and ground‐based GPS Total Electron Content. The observations reveal a pronounced longitudinal asymmetry in the post‐sunset equatorial ionization anomaly (EIA).
Deepak K. Karan +6 more
wiley +1 more source
An Insight into the Solar Dynamo Theory [PDF]
, 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, Tiwari, Babu Ram
core +3 more sources
The Astronomical JournalThe solar dynamo is essentially a cyclic process in which the toroidal component of the magnetic field is converted into the poloidal one and vice versa.
Aparup Ghosh +3 more
doaj +1 more source
Structured Energy Conversion in Kelvin‐Helmholtz Instability
Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.Abstract We present quantitative investigations of the energy conversion pathways—electromagnetic ϵEM $\left({{\epsilon}}^{EM}\right)$, fluid flow ϵf $\left({{\epsilon}}^{f}\right)$, and particle thermal ϵth $\left({{\epsilon}}^{th}\right)$ energies—within the Kelvin‐Helmholtz instability (KHI) observed by the Magnetospheric Multiscale mission. We find
Kyunghwan Dokgo +4 more
wiley +1 more source
Earth and Space Science, Volume 13, Issue 8, August 2026.Abstract A set of fresh Equatorial Plasma Bubbles (EPBs) formed during pre‐sunrise hours in the Southeast Asian sector amid the recovery phase of May 2024 geomagnetic storm. They offered new insights into their formation mechanism. This study used Total Electron Content (TEC) and Rate of TEC Index maps over Indonesia, along with ionosondes in Thailand ...
Sri Ekawati +9 more
wiley +1 more source
Annales Geophysicae, 1999 Two aspects of solar MHD are discussed in relation to the work of the MHD simulation group at KIS. Photospheric magneto-convection, the nonlinear interaction of magnetic field and convection in a strongly stratified, radiating fluid, is a key process ...
M. Schüssler, M. Schüssler
doaj +1 more source