Results 81 to 90 of about 40,516 (259)

Geomagnetic Core Field Models in the Satellite Era

, 2010
After a brief review of the theoretical basis and difficulties that modelers are facing, we present three recent models of the geomagnetic field originating in the Earth’s core. All three modeling approaches are using recent observatory and near-Earth orbiting survey satellite data. In each case the specific aims and techniques used by the modelers are
Lesur, V., Olsen, N., Thomson, A.
openaire   +5 more sources

Mechanisms of Body Alignment in a Diurnal Songbird Migrant

Ethology, Volume 132, Issue 6, Page 399-411, June 2026.
The graphical abstract illustrates the body alignment mechanism of a diurnal songbird migrant, the dunnock (Prunella modularis). Dunnocks consistently expressed an angular body alignment, with inter‐individual variation at the level of the population.
Christina Spiliopoulou, Giuseppe Bianco, Mihaela Ilieva, Susanne Åkesson   +3 more
wiley   +1 more source

Statistical relationships between variations of the geomagnetic field, auroral electrojet, and geomagnetically induced currents

Solar-Terrestrial Physics, 2019
Using observations from the IMAGE magnetic observatories and the station for recording geomagnetically induced currents (GIC) in the electric transmission line in 2015, we examine relationships between geomagnetic field and GIC variations.
Vorobev A.V., Pilipenko V.A., Sakharov Ya.A., Selivanov V.N.   +3 more
doaj   +1 more source

Geomagnetic core field models and secular variation forecasts for the 13th International Geomagnetic Reference Field (IGRF-13)

Earth, Planets and Space, 2020
Observations of the geomagnetic field taken at Earth’s surface and at satellite altitude are combined to construct continuous models of the geomagnetic field and its secular variation from 1957 to 2020.
I. Wardinski, D. Saturnino, H. Amit, A. Chambodut, B. Langlais, M. Mandea, E. Thébault   +6 more
doaj   +1 more source

The use of geomagnetic field models in magnetic surveys [PDF]

The importance of global geomagnetic field models for the reduction of magnetic surveys is discussed. It is demonstrated that a numerical model with adequate secular variation correction, provides a suitable representation of the regional field.
Gain, J. C., Regan, R. D.
core   +1 more source

Nitric Oxide Radiative Relaxation Time: Damping Timescales of Lower Thermospheric Thermal Perturbations

Geophysical Research Letters, Volume 53, Issue 9, 16 May 2026.
Abstract Nitric oxide (NO) radiative cooling governs much of the energy budget in the Earth's lower thermosphere and damps out temperature perturbations. The radiative relaxation time (RRT), the timescale that defines how efficiently infrared radiation damps out the perturbations to the thermal structure to 1/e of the perturbation's initial value, is ...
Ningchao Wang, Martin G. Mlynczak, John T. Emmert, Manuel López‐Puertas, Bernd Funke   +4 more
wiley   +1 more source

Japanese MAGSAT team [PDF]

Construction of a model of the regional magnetic field and investigation of the local magnetic anomalies and their origin were approaches used in attempts to study the crustal structure near Japan and its Antarctic bases.
Fukushima, N., Kawamura, M., Kobayashi, K., Maeda, H., Miyazaki, Y., Ogawa, K., Oshima, S., Tanaka, M., Uyeda, S., Yukutake, T.   +9 more
core   +1 more source

Temporal Change in Resistivity Structure Before and After the 2018 Small Phreatic Eruption Iwo‐Yama Volcano, Kirishima Volcanic Complex, Japan

Geophysical Research Letters, Volume 53, Issue 9, 16 May 2026.
Abstract A small phreatic eruption occurred on April 2018 Iwo‐yama, Kirishima volcanic complex, Japan. We estimated the change in the subsurface resistivity structure before and after the phreatic eruption by repeated magnetotelluric (MT) measurements. A substantial decrease in resistivity was determined in the zone from the surface down to a depth of ...
K. Aizawa, N. Matsushima, Y. Matsunaga
wiley   +1 more source

A Variational Approach for Modeling the Inductive Response of Earth's Mantle to Time‐Varying External Geomagnetic Source

Earth and Space Science
A mathematical and numerical framework is developed for modeling Earth's magnetic field and optimizing the trajectory of the whole system using geomagnetic observations.
Kuan Li
doaj   +1 more source

A new high-resolution geomagnetic field model for southern Africa

South African Journal of Science
Earth’s magnetic field is a dynamic, changing phenomenon. The geomagnetic field consists of contributions from several sources, of which the main field originating in Earth’s core makes up the bulk.
Amore E. Nel, Achim Morschhauser, Foteini Vervelidou, Jürgen Matzka   +3 more
doaj   +1 more source