Results 51 to 60 of about 7,951 (302)

An improved geomagnetic data selection algorithm for global geomagnetic field modelling [PDF]

Geophysical Journal International, 2007
A spherical harmonic degrees 60, global internal field model is described (called BGS/G/L/0706). This model includes a degree 15 core and piecewise-linear secular variation model and is derived from quiet-time Orsted and CHAMP satellite data sampled between 2001.0 and 2005.0.
Thomson, Alan W P, Lesur, Vincent, GeoForchungsZentrum, Potsdam, Germany   +2 more
openaire   +4 more sources

A Compensation Method for the Geomagnetic Measurement Error of an Underwater Ship-Borne Magnetometer Based on Constrained Total Least Squares

Sensors
When magnetic matching aided navigation is applied to an underwater vehicle, the magnetometer must be installed inside the vehicle, considering the navigation safety and concealment of the underwater vehicle.
Yude Tong, Xiaoying Huang, Yongbing Chen, Wenkui Li, Feng Zha   +4 more
doaj   +1 more source

Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model [PDF]

, 2005
We present a simple time-of-flight analysis of Alfvén pulsations standing on closed terrestrial magnetic field lines. The technique employed in this study in order to calculate the characteristic period of such oscillations builds upon earlier time-of ...
Waters, C. L., Yeoman, T. K., Wild, James A.   +2 more
core  

An examination of inter-hemispheric conjugacy in a subauroral polarization stream [PDF]

, 2012
During geomagnetically disturbed conditions the midlatitude ionosphere is subject to intense poleward directed electric fields in the dusk-midnight sector.
Clausen, L.B.N., Freeman, M.P., Clausen, L. B. N., Ruohoniemi, J. M., Kunduri, B.S.R., Talaat, E. R., Baker, J.B.H., Baker, J. B. H., Thomas, E.G., Grocott, A., Kunduri, B. S. R., Talaat, E.R., Freeman, M. P., Thomas, E. G.   +13 more
core   +1 more source

Quantum Phenomena in Molecular and Biological Systems: A Decoherence‐Based Decision Framework With Falsifiable Predictions and a Failure‐Mode Taxonomy

Advanced Physics Research, EarlyView.
A physics‐grounded framework based on decoherence timescales (τ_dec vs τ_func), Markovian validity, and falsifiability criteria is applied across molecular systems to distinguish where quantum effects are necessary, marginal, or irrelevant. The analysis integrates quantum chemistry, biological quantum mechanisms, and quantum computing under a unified ...
Sarfaraz K. Niazi
wiley   +1 more source

A multisource geomagnetic field model incorporating ocean circulation-induced magnetic field

Earth and Planetary Physics
The movement of global ocean circulation in the Earth’s main magnetic field generates a measurable induced magnetic field (about 2 nT at geomagnetic satellite altitudes).
HongBo Yao, JuYuan Xu, Cong Yang, ZhengYong Ren, Keke Zhang   +4 more
doaj   +1 more source

The CHAOS-4 geomagnetic field model [PDF]

Geophysical Journal International, 2014
We present CHAOS-4, a new version in the CHAOS model series, which aims to describe the Earth's magnetic field with high spatial and temporal resolution. Terms up to spherical degree of at least n = 85 for the lithospheric field, and up to n = 16 for the time-varying core field are robustly determined.More than 14 yr of data from the satellites Ørsted,
Olsen, N., Lühr, H., Finlay, C., Sabaka, T., Michaelis, I., Rauberg, J., Toffner-Clausen, L.   +6 more
openaire   +3 more sources

Kalmag: a high spatio-temporal model of the geomagnetic field

Earth, Planets and Space, 2022
Abstract We present the extension of the Kalmag model, proposed as a candidate for IGRF-13, to the twentieth century. The dataset serving its derivation has been complemented by new measurements coming from satellites, ground-based observatories and land, marine and airborne surveys.
Julien Baerenzung, Matthias Holschneider, Jan Saynisch-Wagner, Maik Thomas   +3 more
openaire   +4 more sources

Geomagnetic Impulses and the Electrical Conductivity of the Lower Mantle [PDF]

, 1991
This thesis is an investigation of the changes in the magnetic field as measured at the surface of the Earth on the time-scale of months to decades. In particular the phenomena of geomagnetic "impulses" or "jerks" are investigated.
Stewart, Douglas Norman
core  

A Prospection‐Led Archaeological Investigation of a Picenian and Roman Necropolis in Corinaldo (Marche, Italy)

Archaeological Prospection, EarlyView.
ABSTRACT This paper presents the results of an integrated archaeological and geophysical investigation conducted between 2018 and 2024 at the newly discovered Picenian and Roman necropolis of Contrada Nevola (Corinaldo, Marche, Central Italy), identified in the framework of development‐led archaeology. The research strategy combined aerial photography,
Federica Boschi
wiley   +1 more source