Results 51 to 60 of about 447 (185)
Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.Abstract Global warming warms the lower atmosphere, but cools and contracts the upper atmosphere. These changes also affect the ionosphere, altering the vertical distribution of plasma through changes in the plasma scale height. Here, we use ionospheric equivalent slab thickness (τ) multidecadal time series, derived through observations from co‐located
A. Pignalberi, T. Alberti
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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 +3 more
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Earth and Space Science, Volume 13, Issue 8, August 2026.Abstract A set of fresh Equatorial Plasma Bubbles (EPBs) formed during pre‐sunrise hours in the Southeast Asian sector amid the recovery phase of May 2024 geomagnetic storm. They offered new insights into their formation mechanism. This study used Total Electron Content (TEC) and Rate of TEC Index maps over Indonesia, along with ionosondes in Thailand ...
Sri Ekawati +9 more
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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
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Bulgarian Geomagnetic Reference Field (BulGRF) for 2015.0 and secular variation prediction model up to 2020 [PDF]
Annales Geophysicae, 2017 The Bulgarian Geomagnetic Reference Field (BulGRF) for 2015.0 epoch and its secular variation model prediction up to 2020.0 is produced and presented in this paper.
M. Metodiev, P. Trifonova
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Polytropic Index and Thermodynamic Behavior of the Central Plasma Sheet Near Lunar Distances
Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.Abstract In addition to making near‐Earth observations, the THEMIS/ARTEMIS mission is uniquely positioned at lunar distance, in the deep magnetotail, reaching distances of 60 RE ${R}_{E}$ and further. This vantage point allows ARTEMIS to access the plasma sheet and measure entropy evolution across convective channels, plasma flow gradients ...
Ephrem Tesfaye Desta +2 more
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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
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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
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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
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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
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