Results 21 to 30 of about 3,303 (168)

An Improved Aeromagnetic Compensation Method Robust to Geomagnetic Gradient

Applied Sciences, 2022
Aeromagnetic surveys play an important role in many fields, for example, archaeology, anti-submarine warfare, and geophysical exploration. Being in the geomagnetic field, the aircraft generates a great deal of magnetic interference, resulting in bad ...
Yongqiang Feng, Qimao Zhang, Yaoxin Zheng, Xiaodong Qu, Fang Wu, Guangyou Fang   +5 more
doaj   +1 more source

US/UK Candidates for the Definitive Geomagnetic Reference Field Model DGRF-85 and the Predictive International Geomagnetic Reference Field Model IGRF-90.

Journal of geomagnetism and geoelectricity, 1992
Candidate models for the Definitive Geomagnetic Reference Field 1985 (DGRF-85) and the 1990 International Geomagnetic Reference Field (IGRF-90) have been produced jointly by the British Geological Survey and the United States Naval Oceanographic Office as part of their respective World Magnetic Modeling and Charting programs which are sponsored by the ...
David R. BARRACLOUGH, Larry D. WILLIAMS, John M. QUINN   +2 more
openaire   +2 more sources

Can core-surface flow models be used to improve the forecast of the Earth's main magnetic field? [PDF]

, 2008
[1] Geomagnetic main field models used for navigation are updated every 5 years and contain a forecast of the geomagnetic secular variation for the upcoming epoch. Forecasting secular variation is a difficult task.
Alexandrescu, Alexandrescu, Alexandrescu, Backus, Backus, Bloxham, Bloxham, Bloxham, Braginsky, Courtillot, Eymin, Fournier, Gauthier Hulot, Gubbins, Holme, Holme, Hulot, Hulot, Hulot, Hulot, Jackson, Jackson, Jault, Jault, Langel, Le Huy, LeMouël, Liu, Luis Silva, Maus, Maus, Maus, Menke, Mound, Olsen, Olsen, Pais, Rau, Roberts, Sabaka, Stefan Maus, Voorhies, Voorhies, Voorhies, Waddington, Whaler, Zatman   +46 more
core   +5 more sources

Mapping of steady-state electric fields and convective drifts in geomagnetic fields – Part 2: The IGRF [PDF]

Annales Geophysicae, 2016
A method of mapping electric fields along geomagnetic field lines is applied to the IGRF (International Geomagnetic Reference Field) model. The method involves integrating additional sets of first order differential equations simultaneously with ...
A. D. M. Walker
doaj   +1 more source

Development of a Systematic Model for Study on the Phenomena of Ionospheric and Geomagnetic Variations [PDF]

Journal of Astronomy and Space Sciences, 1999
Solar activities ejecting high energy particles influence satellites and satellite communications as well as perturb geomagnetic fields. To understand space environments near the Earth being influenced by the Sun, we must study about the magnetosphere ...
Yoo Surn Pyo, Hwang-Jae Rhee, Min-Geun Kim, Eunhwa Kim, Sung-Hee Song, Jinny Lee, Dong-Hun Lee   +6 more
doaj  

Study on Long-Term Variation Characteristics of Geomagnetic Cutoff Rigidities of Energetic Protons Caused by Long-Term Variation of Geomagnetic Field

Frontiers in Earth Science, 2022
As a parameter that quantitatively measures the shielding effect of the Earth’s magnetic field on energetic particles, the geomagnetic cutoff rigidities will change significantly with the long-term change of geomagnetic field.
Wei Chu, Yanyan Yang, Song Xu, Gang Qin , Jianping Huang, Zhima Zeren, Xuhui Shen   +6 more
doaj   +1 more source

The Phase Space Density Evolution of Radiation Belt Electrons under the Action of Solar Wind Dynamic Pressure

Magnetochemistry, 2023
Earth’s radiation belt and ring current are donut-shaped regions of energetic and relativistic particles, trapped by the geomagnetic field. The strengthened solar wind dynamic pressure (Pdyn) can alter the structure of the geomagnetic field, which can ...
Peng Hu, Haimeng Li, Zhihai Ouyang, Rongxin Tang, Liangjin Song, An Yuan, Bopu Feng, Yangyang Wang, Wenqian Zou   +8 more
doaj   +1 more source

The BGS candidate models for IGRF-13 with a retrospective analysis of IGRF-12 secular variation forecasts

Earth, Planets and Space, 2021
The three candidate models submitted by the British Geological Survey for the 13th generation International Geomagnetic Reference Field are described.
William J. Brown, Ciarán D. Beggan, Grace A. Cox, Susan Macmillan   +3 more
doaj   +1 more source

Testing Geomagnetic Reference Field models for 1990-2000 with data from the Trelew Geomagnetic Observatory, Argentina [PDF]

Geofísica Internacional, 2003
Every five years a new International Geomagnetic Reference Field (IGRF) model is released and the secular variation for the previous period is updated, producing the definitive DGRF model.
Marta E. Ghidella, Jacqueline Köhn, Julio C. Gianibelli   +2 more
doaj  

A candidate secular variation model for IGRF-13 based on MHD dynamo simulation and 4DEnVar data assimilation

Earth, Planets and Space, 2020
We have submitted a secular variation (SV) candidate model for the thirteenth generation of International Geomagnetic Reference Field model (IGRF-13) using a data assimilation scheme and a magnetohydrodynamic (MHD) dynamo simulation code.
Takuto Minami, Shin’ya Nakano, Vincent Lesur, Futoshi Takahashi, Masaki Matsushima, Hisayoshi Shimizu, Ryosuke Nakashima, Hinami Taniguchi, Hiroaki Toh   +8 more
doaj   +1 more source