Results 71 to 80 of about 737 (157)

Space Weather Forecasts of Ground Level Space Weather in the UK: Evaluating Performance and Limitations

Space Weather, Volume 22, Issue 11, November 2024.
Abstract Geomagnetically Induced Currents (GICs) are a severe space weather hazard, driven through coupling between the solar wind and magnetosphere. GICs are rarely measured directly, instead the ground magnetic field variability is often used as a proxy.
A. W. Smith, I. J. Rae, C. Forsyth, J. C. Coxon, M.‐T. Walach, C. J. Lao, D. S. Bloomfield, S. A. Reddy, M. K. Coughlan, A. Keesee, S. Bentley   +10 more
wiley   +1 more source

Obtaining High‐Resolution Magnetic Records From Speleothems Using Magnetic Microscopy

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 10, October 2024.
Abstract Speleothems are mineral deposits capable of recording detrital and/or chemical remanent magnetization at annual timescales. They can offer high‐resolution paleomagnetic records of short‐term variations in Earth's magnetic field, crucial for understanding the evolution of the dynamo.
Cauê S. Borlina, Eduardo A. Lima, Joshua M. Feinberg, Plinio Jaqueto, Ioan Lascu, Ricardo I. F. Trindade, Eric Font, Elisa M. Sánchez‐Moreno, Luca Antonio Dimuccio, Yusuke Yokoyama, Josep M. Parés, Benjamin P. Weiss, Jeffrey A. Dorale   +12 more
wiley   +1 more source

A Statistical Study of the Properties of, and Geomagnetic Responses to, Large, Rapid Southward Turnings of the Interplanetary Magnetic Field

Journal of Geophysical Research: Space Physics, Volume 129, Issue 9, September 2024.
Abstract The interplanetary magnetic field (IMF) north‐south component, Bz, plays a crucial role in the interaction between the solar wind and the Earth's magnetosphere. We analyze 98 intervals in which Bz changed from >3 nT to <−3 nT in 5 min and for which these rapid southward turnings (STs) were surrounded by consistently northward or southward IMF.
Chiara Lazzeri, Andrey Samsonov, Colin Forsyth, Graziella Branduardi‐Raymont, Yulia V. Bogdanova   +4 more
wiley   +1 more source

Core-mantle boundary deformations and J2 variations resulting from the 2004 Sumatra earthquake

, 2007
The deformation at the core-mantle boundary produced by the 2004 Sumatra earthquake is investigated by means of a semi-analytic theoretical model of global coseismic and postseismic deformation, predicting a millimetric coseismic perturbation over a ...
A. Piersanti, Alfonsi, Banerjee, Bloxham, Boschi, Boschi, Chao, Chao, Cheng, Cox, D. Melini, Dumberry, Dumberry, Dziewonski, Dziewonski, F. Florindo, Florindo, Florindo, Gross, Lambeck, Marquart, Mitrovica, Nostro, P. De Michelis, Park, Piersanti, Piersanti, Pollitz, Sabadini, Tsai, V. Cannelli   +30 more
core   +1 more source

On the Association of Substorm Identification Methods

Journal of Geophysical Research: Space Physics, Volume 129, Issue 9, September 2024.
Abstract Substorms are a rapid release of energy that is redistributed throughout the magnetosphere‐ionosphere system, resulting in many observable signals, such as enhancements in the aurora, energetic particle injections, and ground magnetic field perturbations.
C. J. Lao, C. Forsyth, M. P. Freeman, A. W. Smith, M. K. Mooney   +4 more
wiley   +1 more source

Dynamic evolution of amplitude and position of geomagnetic secular acceleration pulses since 2000

Frontiers in Earth Science
Recent studies on the behavior of geomagnetic secular acceleration (SA) pulses have provided a basis for understanding the dynamic processes in the Earth’s core.
Chunhua Bai, Guoming Gao, Limin Wen, Guofa Kang   +3 more
doaj   +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  

Revisiting the Excitation of Free Core Nutation

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 9, September 2024.
Abstract Earth possesses a Poincaré mode called Free Core Nutation (FCN) due to the misalignment of the rotation axes of the mantle and fluid outer core. FCN is the primary signal in the observations of Celestial Pole Offsets (CPO) and maintained by geophysical mechanisms that are yet to be understood. Earlier studies suggested an origin in Atmospheric
Mostafa Kiani Shahvandi, Michael Schindelegger, Lara Börger, Siddhartha Mishra, Benedikt Soja   +4 more
wiley   +1 more source

The radiation environment in a Low Earth Orbit: the case of BeppoSAX

, 2014
Low-inclination, low altitude Earth orbits (LEO) are of increasing importance for astrophysical satellites, due to their low background environment. Here, the South Atlantic Anomaly (SAA) is the region with the highest amount of radiation.
Campana, R., Del Monte, E., Feroci, M., Frontera, F., Orlandini, M.   +4 more
core   +1 more source

Twenty years of geomagnetic field observations at Mario Zucchelli Station (Antarctica) [PDF]

, 2007
During the 1986-87 austral summer a geomagnetic observatory was installed at Terra Nova Bay. During the first years both geomagnetic field time variation monitoring and absolute measurements were carried out only during summer.
Cullinane, C, Dutton-Regester, K, Filipp, FV, Gallagher, SJ, Gowrishankar, K, Gunatilake, D, Hayward, NK, Heinemann, A, Hersey, P, Madore, J, Mann, GJ, McArthur, GA, Pupo, GM, Strbenac, D, Tiffen, JC, Yang, JY   +15 more
core   +3 more sources