Results 21 to 30 of about 5,592 (185)

Predictions of the geomagnetic secular variation based on the ensemble sequential assimilation of geomagnetic field models by dynamo simulations

Earth, Planets and Space, 2020
The IGRF offers an important incentive for testing algorithms predicting the Earth’s magnetic field changes, known as secular variation (SV), in a 5-year range. Here, we present a SV candidate model for the 13th IGRF that stems from a sequential ensemble
Sabrina Sanchez, Johannes Wicht, Julien Bärenzung   +2 more
doaj   +1 more source

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

Comparison of candidate IGRF models.

Journal of geomagnetism and geoelectricity, 1982
Three candidate models for the International Geomagnetic Reference Field (IGRF) for the years 1965, 1970, 1975, and 1980 are evaluated using magnetic observatory and satellite data. The models were submitted by the USGS, the IGS, and NASA. Comparison based on annual means data shows the differences between models to be small, although the NASA model ...
R. A. LANGEL, R. H. ESTES
openaire   +2 more sources

Evidence-based uncertainty estimates for the International Geomagnetic Reference Field

Earth, Planets and Space, 2022
The International Geomagnetic Reference Field (IGRF) is a multi-institute model of the Earth’s magnetic field, compactly described by sets of up to 195 spherical harmonic (Gauss) coefficients to degree and order 13, which allows the continuous evaluation
Ciarán D. Beggan
doaj   +1 more source

IZMIRAN candidate field model for IGRF-13

Earth, Planets and Space, 2021
The International Geomagnetic Reference Field (IGRF) model is a combination of the several models developed by independent groups of scientists using different approaches for the selection of input data and methods for calculating harmonic coefficients ...
Valeriy G. Petrov, Tatyana N. Bondar
doaj   +1 more source

Kajian Sebaran Air Panas di Kelurahan Tobololo dan Kelurahan Sulamadaha Kecamatan Pulau Ternate Kota Ternate

Jurnal Ilmiah Pendidikan Fisika Al-Biruni, 2015
Tujuan dari penelitian ini adalah untuk mengetahui potensi panas bumi dan sebaran air panas di sekitar Kelurahan Tobololo dan Kelurahan Sulamadaha, Pulau Ternate bagian utara.
Abdul Haris Rajab, Rohima Wahyu Ningrum, Jumaris Jumaris   +2 more
doaj   +1 more source

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

Radial distribution of the inner magnetosphere plasma pressure using low-altitude satellite data during geomagnetic storm: the March 1-8, 1982 Event

, 2007
Plasma pressure distribution in the inner magnetosphere is one of the key parameters for understanding the main magnetospheric processes including geomagnetic storms and substorms.
Antonova, Antonova, Antonova, Antonova, Antonova, Borovsky, Bosqued, Daglis, DeMichelis, Dessler, E.E. Antonova, Iyemori, J.M. Bosqued, Kozelova, Liemohn, Lui, Lui, Lui, Lyons, Lyons, M. Stepanova, McPherron, Newell, Newell, Parker, Pulkkinen, Sckopke, Stepanova, Stepanova, Stepanova, Sugiura, Tsyganenko, Tsyganenko, Tsyganenko, Tverskaya, Tverskaya, Tverskoy, Williams, Wing, Wing, Zaharia, Zaharia   +41 more
core   +1 more source

Parent magnetic field models for the IGRF-12GFZ-candidates [PDF]

Earth, Planets and Space, 2015
We propose candidate models for IGRF-12. These models were derived from parent models built from 10 months of Swarm satellite data and 1.5 years of magnetic observatory data. Using the same parameterisation, a magnetic field model was built from a slightly extended satellite data set.
Lesur, Vincent, Rother, Martin, Wardinski, Ingo, Schachtschneider, Reyko, Hamoudi, Mohamed, Chambodut, Aude   +5 more
openaire   +5 more sources

Recent Developments in Fabrication Methods and Measurement Schemes for Optically Pumped Magnetic Gradiometers: A Comprehensive Review

Micromachines, 2023
Optically pumped gradiometers have long been utilized in measurement in the International Geomagnetic Reference Field (IGRF). With advancements in technologies such as laser diodes and microfabrication, integrated gradiometers with compact sizes have ...
Haifeng Dong, Hangfei Ye, Min Hu, Zongmin Ma   +3 more
doaj   +1 more source