Results 41 to 50 of about 1,036 (175)

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

Predicting Geomagnetic Activity in the Ascending and Declining Phases of the Solar Cycle

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Most predictions of space climate, that is, the long‐term behavior of the solar‐terrestrial environment, have focused on forecasting the 11‐year sunspot cycle. Geomagnetic activity, on the other hand, has mainly been predicted in shorter, space weather timescales of up to days to weeks.
Timo Qvick, Timo Asikainen, Kalevi Mursula   +2 more
wiley   +1 more source

Waldmeier law for sunspot cycles: Statistical significance and implications for dynamo

Solar-Terrestrial Physics
Waldmeier 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

Model‐Based Analysis of Ionospheric TEC Disturbances Over China and Adjacent Regions During the May 2024 Super Geomagnetic Storm

Space Weather, Volume 24, Issue 8, August 2026.
Abstract This study uses observation data from multi‐constellation (GPS/GLONASS/Galileo/BeiDou) ground‐based Global Navigation Satellite Systems (GNSS) networks and a non‐integrated spherical harmonic function modeling methodology to develop an ionospheric Total Electron Content (TEC) model with high spatiotemporal resolution (1° × 1° in longitude and ...
Heng Xu, Wengeng Huang, Jiayue Yang, Hua Shen, Lei Zhang, Xin Wang   +5 more
wiley   +1 more source

Light Element Exsolution in Fe‐Si‐C‐(H) System: A Mechanism for Powering Mercury's Early Core Dynamo

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Mercury is one of the few terrestrial planets in the solar system with a magnetic field, yet the energy source to power its core dynamo remains unclear to date. Si, C, and possibly H are the top candidate light elements for its liquid core. Here, we showed experimentally that Si, C, and H in Fe‐Si‐C and Fe‐Si‐C‐H liquids share a simultaneous ...
Yuanjing Li, Liangliang Zhang, Fabin Pan, Xiaojing Lai, Xiang Wu, Feng Zhu   +5 more
wiley   +1 more source

Solar dynamo [PDF]

, 2013
No abstract available.
Kosovichev, A. G., Arlt, R., Bonanno, A., Brandenburg, A., Brun, A. S., Busse, F. H., Dikpati, M., Hara, H., Hill, F., Gilman, P. A., Kitiashvili, I. N., Kleeorin, N., Komm, R., Mansour, N. N., Miesch, M., Nordlund, A., Pevtsov, A. A., Pipin, V. V., Rempel, M., Rogachevskii, I., Ruediger, G., Stein, R. F., Sekii, T., Simitev, R., Stenflo, J. O., Thompson, M. J., Ulrich, R. K., Yokoi, N., Yokoyama, T., Wray, A. A., Zhao, J.   +30 more
openaire  

Characterizing the Solar Cycle Variability Using Nonlinear Time Series Analysis at Different Amounts of Dynamo Supercriticality: Solar Dynamo is Not Highly Supercritical

The Astronomical Journal
The 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, Pawan Kumar, Amrita Prasad, Bidya Binay Karak   +3 more
doaj   +1 more source

Impact of Magnetosphere Forcing and Model Resolution on Joule Heating Estimates in WACCM‐X During the 24 August 2005 Storm

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract We investigate the high‐latitude Joule heating in a recently developed high‐resolution configuration of the WACCM‐X whole‐atmosphere model coupled to the MAGE model. Model resolution and geomagnetic forcing effects during the severe (Kp>8) $(Kp > 8)$ geomagnetic storm on 24 August 2005 are analyzed, distinguishing storm peak and recovery ...
Florian Günzkofer, Hanli Liu, Kevin Pham, Huixin Liu, Gunter Stober, Joseph M. McInerney, David R. Themens, Claudia Borries   +7 more
wiley   +1 more source

Magnetic Signature of the Corona Lava Tube (Lanzarote, Canary Islands), a Lunar and Martian Planetary Analog

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract Lava tubes and caves are key exploration targets on the Moon and Mars due to their potential to serve as natural infrastructure for future crewed missions. However, identifying these structures efficiently and reliably remains a major challenge.
J. Martin de Blas, Y. M. Martos, J. R. Espley, D. A. Sheppard, S. P. Scheidt, J. A. Richardson, J. E. P. Connerney   +6 more
wiley   +1 more source

Simulating solar MHD [PDF]

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