Results 71 to 80 of about 1,592 (224)
Thermospheric atomic oxygen density estimates using the EISCAT Svalbard Radar [PDF]
, 2013 [1] Coupling between the ionized and neutral atmosphere through particle collisions allows an indirect study of the neutral atmosphere through measurements of ionospheric plasma parameters. We estimate the neutral density of the upper thermosphere above ~
Sutton, E. +11 more
core +1 more source
Short-term prediction of geomagnetic secular variation with an echo state network
Earth, Planets and SpaceA technique for predicting the secular variation (SV) of the geomagnetic field based on the echo state network (ESN) model is proposed. SV is controlled by the geodynamo process in the Earth’s outer core, and modeling its nonlinear behaviors can be ...
Shin’ya Nakano, Sho Sato, Hiroaki Toh
doaj +1 more source
A New View of Long-Term Geomagnetic Field Secular Variation
Frontiers in Earth Science, 2018 This study carries out a statistical analysis of high-resolution PSV records for the last ~70 ka from three different regions of the Earth. We consider directional and intensity variability in each region on time scales of 103-105 years in order to ...
Steve P. Lund
doaj +1 more source
Sequential modelling of the Earth’s core magnetic field
Earth, Planets and Space, 2020 We describe a new, original approach to the modelling of the Earth’s magnetic field. The overall objective of this study is to reliably render fast variations of the core field and its secular variation.
Guillaume Ropp +3 more
doaj +1 more source
Scaling of the geomagnetic secular variation timescale
Geophysical Journal InternationalSUMMARY The ratio of the magnetic power spectrum and the secular variation spectrum measured at the Earth’s surface provides a timescale $\tau _{\rm sv}(l)$ as a function of spherical harmonic degree l. $\tau _{\rm sv}$ is often assumed to be representative of timescales related to the dynamo inside the outer core and its scaling with l ...
Yue-Kin Tsang, Chris A Jones
openaire +3 more sources
Secular variation of Geomagnetic Elements at Alibag-
MAUSAM, 1969 Attempts are made to represent secular variations of geomagnetic elements (H. Z and D) of Alibag by fitting polynomials of third order to the observed annual mean values for the years 1905-65. The coefficients of the fitted curve account for more than 99 percent of the total variation in case of H and D and 98 per cent in case of z.
DRK RAO, RK BANSAL
openaire +1 more source
Advanced Quantum Technologies, Volume 9, Issue 6, June 2026.ABSTRACT Recent advances at the intersection of quantum physics, neuroscience, and cognitive science have renewed interest in whether quantum phenomena and quantum‐inspired formalisms can inform models of human cognition and decision‐making. While classical neural and computational models explain many aspects of perception and behavior, they face ...
Hamidreza Namazi +3 more
wiley +1 more source
Geomagnetic Secular Variation Over and Near the Antarctic Continent
Antarctic Record, 1961 南極大陸近辺における地球磁場の永年変化は著しくはげしいことが,IGY南極観測の結果明らかになった.特に,昭和基地近傍はその変化量がはげしく,鉛直磁力の変化量は約2×10γ/年にも達する.第4図と第5図とを比較すれば,南半球,特に南極大陸近辺の地球磁場永年変化が北半球のそれに比していかに著しいものであるか一見して明らかであろう.特に昭和基地とHeard島の間は2800kmの距離であるにかかわらず,前者ではZ=181γ/年,後者ではZ=-98γ/年である.このきわめて顕著な永年変化局部異常は第6図に示す如く,
Takesi NAGATA
doaj +1 more source
Statistical evaluation of global geomagnetic field models over Southern Africa during 2015
Earth, Planets and Space, 2017 Global geomagnetic field models using spherical harmonic basis functions are important in space physics research, space weather and applications like navigation and mineral resources exploration.
P. B. Kotzé
doaj +1 more source
Signs of a new geomagnetic jerk between 2019 and 2020 from Swarm and observatory data
Earth, Planets and Space, 2021 Highlights Observatory and Swarm data reveal a new geomagnetic jerk around 2019–2020. A very recent geomagnetic field model indicates the global character of the new jerk. A new pulse at the CMB around mid-2018 seems to be the starting point of this jerk.
F. Javier Pavón-Carrasco +3 more
doaj +1 more source