Results 81 to 90 of about 733 (165)

Prandtl-number dependence of convection-driven dynamos in rotating spherical fluid shells [PDF]

, 2005
The value of the Prandtl number P exerts a strong influence on convection-driven dynamos in rotating spherical shells filled with electrically conducting fluids.
Busse, F.H., Simitev, R.
core   +3 more sources

Revisiting the Excitation of Free Core Nutation

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 9, September 2024.
Abstract Earth possesses a Poincaré mode called Free Core Nutation (FCN) due to the misalignment of the rotation axes of the mantle and fluid outer core. FCN is the primary signal in the observations of Celestial Pole Offsets (CPO) and maintained by geophysical mechanisms that are yet to be understood. Earlier studies suggested an origin in Atmospheric
Mostafa Kiani Shahvandi, Michael Schindelegger, Lara Börger, Siddhartha Mishra, Benedikt Soja   +4 more
wiley   +1 more source

Magnetic observatory data and metadata : types and availability [PDF]

, 2010
The availability of magnetic observatory data has evolved rapidly with the transition of observatories from analogue photographic magnetograms to digital electronic recordings, and the advent of the internet for instant global access to information ...
Alex, Sobhana, Herzog, Donald, Kharin, Evgeny, McLean, Susan, Nose, Masahito, Reay, Sarah, Sergeyeva, Natalia   +6 more
core   +1 more source

Evaluating Auroral Forecasts Against Satellite Observations Under Different Levels of Geomagnetic Activity

Journal of Geophysical Research: Space Physics, Volume 129, Issue 8, August 2024.
Abstract The aurora and associated high energy particles and currents pose a space weather hazard to communication networks and ground‐based infrastructure. Forecasting the location of the auroral oval forms an integral component of daily space weather operations.
M. K. Mooney, C. Forsyth, M. S. Marsh, L. Bradley, T. Finnigan, F. Forde, F. Garrigan, C. Mancini‐Tuffier, T. Mancini‐Tuffier, E. Roberts, P. Vessoni, J. Powell, S. Clark, C. J. Lao, A. Smith, D. R. Jackson, S. Bingham, M. Sharpe, T. Hughes, G. Chisham, S. Milan   +20 more
wiley   +1 more source

Dynamic evolution of amplitude and position of geomagnetic secular acceleration pulses since 2000

Frontiers in Earth Science
Recent studies on the behavior of geomagnetic secular acceleration (SA) pulses have provided a basis for understanding the dynamic processes in the Earth’s core.
Chunhua Bai, Guoming Gao, Limin Wen, Guofa Kang   +3 more
doaj   +1 more source

The Swarm Initial Field Model for the 2014 geomagnetic field [PDF]

, 2015
Data from the first year of ESA's Swarm constellation mission are used to derive the Swarm Initial Field Model (SIFM), a new model of the Earth's magnetic field and its time variation.
Arnaud Chulliat, Backus, Christopher C. Finlay, Chulliat, Ciaran Beggan, Eigil Friis-Christensen, Finlay, Friis-Christensen, Gauthier Hulot, Gillet, Hermann Lühr, Holme, Kan, Khokhlov, Kotsiaros, Lars Tøffner-Clausen, Mandea, Newell, Nils Olsen, Olsen, Olsen, Olsen, Pierre Vigneron, Richmond, Roger Haagmans, Rother, Rune Floberghagen, Sabaka, Sabaka, Silva, Stavros Kotsiaros, Stern, Terence J. Sabaka, Thébault, Ultré-Guérard, Vincent Lesur   +35 more
core   +3 more sources

Time Sequence of Magnetospheric Responses to a Southward IMF Turning

Journal of Geophysical Research: Space Physics, Volume 129, Issue 7, July 2024.
Abstract We use MHD simulations to study the time sequence of magnetospheric responses to a synthetic event with a southward interplanetary magnetic field (IMF) turning. The onset of dayside magnetopause reconnection launches a weak rarefaction wave and sunward flow in the equatorial magnetosphere simultaneously with a tailward flow through the polar ...
Andrey Samsonov, Stephen Milan, Natalia Buzulukova, David Sibeck, Colin Forsyth, Graziella Branduardi‐Raymont, Lei Dai   +6 more
wiley   +1 more source

Forecasting geomagnetic time series for global field modelling [PDF]

, 2018
The secular variation (SV) of the geomagnetic field is difficult to accurately predict with our current incomplete knowledge of its governing physics. Many academic and applied studies rely on the extrapolation of global field models beyond their most ...
Brown, William, Finlay, Chris, Hammer, Magnus   +2 more
core  

The radiation environment in a Low Earth Orbit: the case of BeppoSAX

, 2014
Low-inclination, low altitude Earth orbits (LEO) are of increasing importance for astrophysical satellites, due to their low background environment. Here, the South Atlantic Anomaly (SAA) is the region with the highest amount of radiation.
Campana, R., Del Monte, E., Feroci, M., Frontera, F., Orlandini, M.   +4 more
core   +1 more source

Evidence for a new geomagnetic jerk in 2014

Geophysical Research Letters, 2015
AbstractThe production of quasi‐definitive data at Ebre observatory has enabled us to detect a new geomagnetic jerk in early 2014. This has been confirmed by analyzing data at several observatories in the European‐African and Western Pacific‐Australian sectors in the classical fashion of looking for the characteristic V shape of the geomagnetic secular
J. Miquel Torta, F. Javier Pavón‐Carrasco, Santiago Marsal, Christopher C. Finlay   +3 more
openaire   +1 more source