Results 61 to 70 of about 22,416 (198)

Dynamos in Stellar Convection Zones: of Wreaths and Cycles

, 2010
We live near a magnetic star whose cycles of activity are driven by dynamo action beneath the surface. In the solar convection zone, rotation couples with plasma motions to build highly organized magnetic fields that erupt at the surface and undergo ...
Brown, Benjamin P
core   +1 more source

Dynamo models of grand minima [PDF]

, 2011
Since a universally accepted dynamo model of grand minima does not exist at the present time, we concentrate on the physical processes which may be behind the grand minima.
Arnab Rai Choudhuri, Brandenburg, Brandenburg, Chatterjee, Choudhuri, Choudhuri, Choudhuri, D'Silva, Goel, Hoyng, Ivanova, Karak, Küker, Moss, Ossendrijver, Schmitt, Schmitt, Sokoloff, Steenbeck, Stix, Usoskin, Usoskin   +21 more
core   +1 more source

Solar dynamo models

Journal of Physics: Conference Series, 2008
Mean-field dynamo models and 3D magnetohydrodynamic (MHD) simulations of global-scale solar convection provide complementary insights into the origins of cyclic magnetic activity in the Sun. One particular class of mean-field dynamo models, known as the Babcock-Leighton Flux-Transport (BL-FT) modeling approach, has enjoyed much success recently in ...
openaire   +1 more source

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

Quiet‐Time Equatorial Ionization Anomaly Reversal Observed by the Satellites of Defense Meteorological Satellite Program (DMSP) and Ionospheric Connection Explorer (ICON)

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract We investigated the quiet‐time temporal variations of the Equatorial Ionization Anomaly (EIA) and underlying plasma fountain observed in the topside ionosphere during the various F‐region equatorial E × B drift events recorded by the Jicamarca Incoherent Scatter Radar and simulated by SAMI3.
Ildiko Horvath, Brian C. Lovell
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

Polar branches of stellar activity waves: dynamo models and observations

, 2011
[Abridged abstract:] Stellar activity data provide evidence of activity wave branches propagating polewards rather than equatorwards (the solar case). Stellar dynamo theory allows polewards propagating dynamo waves for certain governing parameters.
A. F. Lanza, Baliunas, Baliunas, Barnes, Berdyugina, Brandenburg, Brandenburg, Brandenburg, Brandenburg, Brandenburg, Charbonneau, Choudhuri, Courvoisier, Covas, D. Moss, D. Sokoloff, Dikpati, Dikpati, Dikpati, Donahue, Durney, Granzer, Hall, Holzwarth, Işik, Jeffers, Jouve, Järvinen, Katsova, Kleeorin, Kovári, Käpylä, Lanza, Lanza, Mackay, Makarov, Messina, Moss, Moss, Moss, Moss, Moss, Noyes, Noyes, Oláh, Ossendrijver, Rüdiger, Rüdiger, Rüdiger, Schmitt, Schrijver, Strassmeier, Subramanian, Tobias, Vogt, Wilmot-Smith, Zhang   +56 more
core   +1 more source

Global GNSS Observation of Mesoscale Ionospheric Irregularities (2006–2024)

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Mesoscale ionospheric irregularities are statistically investigated using an unprecedented 19‐year long‐term global GNSS (Global Navigation Satellite System) TEC (total electron content) data set. These irregularities are represented by ionospheric fluctuations within a 5°× ${}^{\circ}\times $ 3.75° ${}^{\circ}$ (latitude by longitude) region ...
Shun‐Rong Zhang, Jing Liu, Anthea J. Coster, Sevag Derghazarian, Philip J. Erickson, Larisa P. Goncharenko, Nestor Aponte, William Rideout   +7 more
wiley   +1 more source

Numerical simulations of quiet Sun magnetic fields seeded by Biermann battery

, 2017
The magnetic fields of the quiet Sun cover at any time more than 90\% of its surface and their magnetic energy budget is crucial to explain the thermal structure of the solar atmosphere. One of the possible origins of these fields is due to the action of
Collados, M., de Vicente, A., Khomenko, E., Vitas, N.   +3 more
core   +1 more source

Effects of Hydrogen on Fe‐S Alloys and Their Implications for the Martian Core

Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.
Abstract Meteorites suggest the Martian core comprises iron (Fe) or iron‐nickel (Fe‐Ni) alloy with sulfur (S) identified as the primary light element. The InSight data revealed a larger, less dense Martian core than previously estimated, indicating additional light elements.
Xuehui Wei, Stella Chariton, Vitali B. Prakapenka, Yingwei Fei, Sang‐Heon Shim   +4 more
wiley   +1 more source