Results 61 to 70 of about 733 (165)

Comparison of Interannual Oscillations in the F, E, and D‐Region Ionosphere Using Longterm Ground‐Based Measurements

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract This comprehensive study focuses on interannual oscillations from 1 to 25 years in the F, E, and D region ionosphere. By leveraging longterm (1960–2018) continuous ground‐based ionosonde and phase height measurements in northern Germany, we have identified the peak periods and temporal variations of these oscillations using advanced analysis ...
Mani Sivakandan, Dieter H. W. Peters, Jens Mielich, Toralf Renkwitz, Ralph Latteck, Jorge L. Chau   +5 more
wiley   +1 more source

Can a 1-D mantle electrical conductivity model generate magnetic jerk differential time delays? [PDF]

, 2017
Worldwide jerks occurring in 1969, 1978 and 1991 are not simultaneous at the earth's surface, showing differential delays of about 2 yr. One way to explain this intriguing temporal pattern is to consider the earth's mantle as a conductor.
Jackson, A., Pinheiro, K.
core  

Estimating Electron Temperature and Density Using Van Allen Probe Data: Typical Behavior of Energetic Electrons in the Inner Magnetosphere

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract The Earth's inner magnetosphere contains multiple electron populations influenced by different factors. The cold electrons of the plasmasphere, warm plasma that contributes to the ring current, and the relativistic plasma of the radiation belts often seem to behave independently.
D. Rasinskaite, C. E. J. Watt, C. Forsyth, A. W. Smith, C. J. Lao, S. Chakraborty, J. C. Holmes, G. L. Delzanno   +7 more
wiley   +1 more source

The impact of geomagnetic spikes on the production rates of cosmogenic 14C and 10Be in the Earth's atmosphere [PDF]

, 2015
We seek corroborative evidence of the geomagnetic spikes detected in the Near East ca. 980 BC and 890 BC in the records of the past production rates of the cosmogenic nuclides 14C and 10Be.
Alexandre Fournier, Bard, Beer, Ben-Yosef, Cooke, Courtillot, Fraser-Smith, Gallet, Gallet, Gennady A. Kovaltsov, Heikkilä, Holme, Hulot, Ilya Usoskin, Kovaltsov, Kovaltsov, Licht, Livermore, Mandea, McCracken, Muscheler, Philip W. Livermore, Reimer, Roberts, Roth, Ruth, Shaar, Steinhilber, Usoskin, Usoskin, Usoskin, Usoskin, Wessel, Yiou, Yves Gallet   +34 more
core   +3 more sources

Geomagnetic and Archeomagnetic Jerks: Where Do We Stand? [PDF]

Eos, Transactions American Geophysical Union, 2009
The Earth's magnetic field is generated mainly by a self‐sustaining dynamo in the fluid outer core. Known as the core or main field, the dynamo's magnetic field is not constant but changes with time, a phenomenon denoted as secular variation. Unfortunately, no common agreement exists about the definition of secular variation: While some use this term ...
Mandea, M., Olsen, N.
openaire   +3 more sources

Separating DP1 and DP2 Current Pattern Contributions to Substorm‐Like Intensifications in SML

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract Substorms have been identified from negative bays in the AL/SML index, which traces the minimum northward ground magnetic deflection at auroral latitudes, produced by enhancements of the westward electrojet. For substorms, negative bays are caused by the closure of the Substorm Current Wedge through the ionosphere, typically localized to the ...
C. J. Lao, C. Forsyth, M. P. Freeman, J. W. Gjerloev   +3 more
wiley   +1 more source

Preface

Annals of Geophysics, 2009
Earth is a complex dynamic system and study of the geomagnetic field can provide<br />insight to the dynamic processes operative in the outer core where the main field is<br />produced by a geo-dynamo mechanism.
Baldev Arora, Angelo De Santis, Heather McCreadie   +2 more
doaj   +1 more source

Geomagnetic jerks during the Swarm era and impact on IGRF-12 [PDF]

, 2018
Global geomagnetic field models can be used to study the dynamics of the core, aid satellite operation and make global digital navigation possible – from smartphones to guided drilling.
Brown, William, Macmillan, Susan
core  

Assessing the importance and expression of the 6-year geomagnetic oscillation [PDF]

, 2012
The first time derivative of residual length-of-day observations is known to contain a distinctive 6 year periodic oscillation. Here we theorize that through the flow accelerations at the top of the core the same periodicity should arise in the ...
Abarca del Rio, Chulliat, Chulliat, Finlay, Gibert, Gillet, Greff-Lefftz, Hide, Hinderer, Hinderer, Holme, Holme, Huang, Huang, Hulot, Hulot, J. Mound, Jackson, Jackson, Jault, Jault, L. Jackson, L. Silva, Ladynin, Le Huy, Lesur, Maus, McLeod, Mound, Mound, Olsen, Olsen, Olsen, Ponsar, Roberts, Sabaka, Silva, Wessel   +37 more
core   +2 more sources

Heterogeneous Driver‐Aware Vehicle Trajectory Reconstruction and Fusion for Multiple Long‐Range Traffic Detectors

IET Intelligent Transport Systems, Volume 19, Issue 1, January/December 2025.
A trajectory reconstruction method based on long‐range traffic detectors is proposed, which combines Newell car‐following models, the whale optimisation algorithm and particle filters to achieve trajectory reconstruction and fusion. The experimental results show that the method can effectively improve the reconstruction accuracy.
Li Li, Yu‐Tao Liu, Er‐Long Tan, Li‐Yong Zheng, Run‐Min Wang   +4 more
wiley   +1 more source