Results 41 to 50 of about 1,068 (174)

Secular variations of geomagnetic declination in the Karadag point and the global helio-geodynamic processes

Геофизический журнал, 2019
To study the changes in the local variations of geomagnetic field, the Karadag point was chosen due to the fact that we found previously on increased insolation and the surface temperature of the earth at this point over the last century (compared to ...
A. E. Volvach, G. S. Kurbasova
doaj   +1 more source

Metrology for Quantum Hardware Standardization—Charting a Pathway: A Strategic Review

IEEJ Transactions on Electrical and Electronic Engineering, Volume 21, Issue 9, Page 1282-1296, September 2026.
Advances in quantum mechanics have long underpinned metrology by enabling practical realizations of units through quantum effects. With the 2019 SI revision, traceability is anchored in defined fundamental constants, reinforcing the quantum‐mechanical basis of modern standards. In parallel, quantum technologies are transitioning from laboratory science
Nobu‐Hisa Kaneko
wiley   +1 more source

Shannon information of the geomagnetic field for the past 7000 years [PDF]

Nonlinear Processes in Geophysics, 2010
The present behaviour of the geomagnetic field as expressed by the International Geomagnetic Reference Field (IGRF) deserves special attention when compared with that shown over the past few thousands of years by two paleomagnetic/archeomagnetic models ...
A. De Santis, E. Qamili
doaj  

Integrated Multi‐Physics Characterisation of the Northern Kiruna Mining District With Machine‐Learning‐Assisted Interpretation

Geophysical Prospecting, Volume 74, Issue 7, September 2026.
ABSTRACT Integrated earth modelling aims to combine all available geoscientific information to derive one common earth model. However, combining multiple parameters in a meaningful way remains challenging. In this study, we aim to improve mineral exploration workflows through the integration of new magnetotelluric data with other geophysical and ...
Oskar Rydman, Ervin Veress, Maxim Yu. Smirnov, Tobias E. Bauer, Thorkild M. Rasmussen, Niklas Juhojuntti   +5 more
wiley   +1 more source

NOAA/NCEI and University of Colorado candidate models for IGRF-13

Earth, Planets and Space, 2021
The International Geomagnetic Reference Field (IGRF) is a set of parameters representing the large-scale internal part of Earth’s magnetic field. The 13th generation IGRF requested candidate models for a definitive main field for 2015.0, a provisional ...
P. Alken, A. Chulliat, M. Nair
doaj   +1 more source

Global Cowling Effects in the Sq‐EEJ Current System Under Electrostatic Approximation: Theoretical Simulation

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract The solar quiet (Sq) current and equatorial electrojet are widely known as one of the fundamental currents in ionosphere. Although the Sq‐EEJ current system has been extensively investigated, the manner in which Hall and Pedersen current components collectively organize the system has not been clearly described.
T. Ijuin, H. Jin, A. Yoshikawa
wiley   +1 more source

Comparative Analysis of Ion and Electron Contributions to Ionospheric Ionization at Auroral and Subauroral Latitudes

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Electron and proton precipitation into the nightside ionosphere is a key process in magnetosphere–ionosphere coupling. Although auroral electron precipitation at ∼0.1 ${\sim} 0.1$–10 keV is traditionally considered the main driver of auroral emissions, recent studies show that >30 ${ >} 30$ keV electrons and protons can significantly ...
S. R. Kamaletdinov, A. V. Artemyev, Y. Shen, X.‐J. Zhang, Y. Nishimura, J. Liang, V. Angelopoulos, Y. Miyoshi, K. Keika, K. Asamura, A. Bhatt, S. Kasahara, Y. Kasahara, S. Matsuda, T. Hori, A. Matsuoka, M. Teramoto, K. Yamamoto, S. Yokota, A. Shinbori, F. Tsuchiya, A. Kumamoto, I. Shinohara   +22 more
wiley   +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  

Oxygen Ion Percentage Inferred From the Cutoff Frequencies of Ionospheric ELF Hiss Emissions

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract The lower cutoff frequency of hiss emissions observed in the ionosphere is controlled by local plasma composition and density. This study identifies 6,340 ionospheric hiss wave events based on observations from the China Seismo‐Electromagnetic Satellite (CSES‐01) from 1 August 2018 to 31 July 2020.
Bin He, Wenlong Liu, Jiangzhao Ai, Dianjun Zhang, Zeren Zhima, Theodore E. Sarris, Li Zeng, Zhao Zhang, Dapeng Liu   +8 more
wiley   +1 more source

Modeling of regional magnetic field applying spherical functions: practical aspect

Геофизический журнал, 2019
Modeling of geomagnetic field and creation of geomagnetic maps is one of the main directions of geomagnetic studies. For constructing global model the global spherical Lejeandre functions are used in most cases, though for constructing regional magnetic ...
Yu. P. Sumaruk, L. M. Yankiv-Vitkovska, B. B. Dzuman   +2 more
doaj   +1 more source