Results 71 to 80 of about 1,068 (174)

Magnetic anomalies along the traverse route from Syowa to Mizuho Stations, East Antarctica

Antarctic Record, 1984
The 21st Japanese Antarctic Research Expedition (JARE-21) made aeromagnetic surveys along the traverse route from Syowa to Mizuho Stations by using a proton precession magnetometer.
Kazuo Shibuya, Katsutada Kaminuma, Akira Ikami, Kiyoshi Ito   +3 more
doaj   +1 more source

Impacts of Ionospheric Conductance During the December 2021 Solar Eclipse on the Coupled Magnetosphere‐Ionosphere‐Thermosphere System

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Solar eclipses provide unique opportunities to investigate geospace dynamics driven by rapid, localized reductions in solar radiation. On December 4th $4\text{t}\text{h}$, 2021, a total solar eclipse occurred over West Antarctica during substorms.
Yu Hong, Yue Deng, Daniel T. Welling, Aaron J. Ridley, Gang Lu, Astrid Maute, Qingyu Zhu, Sebastijan Mrak, Colin Waters, Cheng Sheng, Minjing Li, Ramon Lopez   +11 more
wiley   +1 more source

Comparison of global geomagnetic field models and evaluation using marine datasets in the north-eastern Atlantic Ocean and western Mediterranean Sea

Earth, Planets and Space, 2018
Many models describing the Earth’s magnetic field exist and are maintained by international research organizations. However, no clear general overview of the cross-compared quality of these models is available. An evaluation of the internal component and
Jean-François Oehler, Didier Rouxel, Marie-Françoise Lequentrec-Lalancette   +2 more
doaj   +1 more source

Ray Tracing Method in a General Non‐Dipole Magnetic Field

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We present a new general mathematical formulation of the Eikonal equations for ray tracing, which can use any internal magnetic field model. The analytical and tractable expressions are conveniently based on a vector formalism, which is independent of any coordinate system.
P.‐L. Blelly, J.‐F. Ripoll, A. Dubois, R. B. Horne, A. Marchaudon   +4 more
wiley   +1 more source

Near‐Earth Cosmic Ray Modulation Index ϕ and Neutron Monitor Cutoff Rigidities at Hourly Cadence: Toward an Improved Monitoring of Solar‐Terrestrial Radiation Environment, Space Weather, and Space Climate

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Cosmic rays (CRs) are energetic particles originating from galactic and extragalactic sources. When arriving into the solar system and the Sun's heliosphere, they are diverted and modulated by the magnetic activity of the Sun. This modulation can be quantified by the modulation parameter ϕ $\phi $ determined with the Force‐field approximation (
Pauli Väisänen, Nicholas Larsen, Sergey Koldobskiy, Markus Similä, David Pelosi, Miguel Orcinha   +5 more
wiley   +1 more source

Recurrent neural network trained with the extended Kalman filter to forecast the geomagnetic secular variation for IGRF-14

Earth, Planets and Space
This study proposes a neural network approach for predicting the geomagnetic secular variation (SV) to improve the accuracy and efficiency of short-term geomagnetic forecasts. The International Geomagnetic Reference Field (IGRF), updated every five years,
Sho Sato, Shin’ya Nakano, Vincent Lesur, Masaki Matsushima, Takuto Minami, Hiroaki Toh   +5 more
doaj   +1 more source

An Optimized Two-Step Magnetic Correction Strategy by Means of a Lagrange Multiplier Estimator with an Ellipsoid Constraint

Sensors, 2018
The geomagnetic field is as fundamental a constituent of passive navigation as Earth’s gravity. In cases where no other external attitude reference is available, for the direct heading angle estimation by a typical magnetic compass, a two-step ...
Linlin Xia, Jingtong Geng, Hanrui Yang, Yunqi Wang, Zhaolong Fu, Bo Meng   +5 more
doaj   +1 more source

Arase/LEPi Observations of Low‐Energy H+ and O+ Ion Fluxes in the Inner Magnetosphere: Implications for the Relationship Between Warm Plasma Cloak and Oxygen Torus

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We investigated the spatial distributions and pitch‐angle distributions of 30–300 eV H+ and O+ ion fluxes using data obtained by the low‐energy particle experiments‐ion mass analyzer (LEPi) onboard the Arase satellite. A statistical analysis over 3.7 years reveals that the H+ ion flux is enhanced at L > 4 from the premidnight sector through ...
Masahito Nosé, Kazushi Asamura, Yoshizumi Miyoshi, Jih‐Hong Shue, Trunali Shah, Ayako Matsuoka, Mariko Teramoto, Kazuhiro Yamamoto, Atsushi Kumamoto, Fuminori Tsuchiya, Yoshiya Kasahara, Atsuki Shinbori, Iku Shinohara   +12 more
wiley   +1 more source

Special issue “International Geomagnetic Reference Field: the thirteenth generation”

Earth, Planets and Space, 2022
P. Alken, E. Thébault, C. D. Beggan, M. Nosé   +3 more
doaj   +1 more source

Modern Ionospheric Ray Tracer for Earth Observation Satellite Missions

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Electromagnetic waves propagation through the ionosphere is subject to several effects including refraction, absorption, signal delay, or Faraday rotation.
Carlos Molina, Elena Fernandez-Nion, Adriano Camps   +2 more
doaj   +1 more source