Results 71 to 80 of about 6,743 (215)

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, Santiago Marsal, Saioa A. Campuzano, J. Miquel Torta   +3 more
doaj   +1 more source

Multi‐Decadal Trends in the Low Latitude foF2 Driven by Secular Magnetic Variations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Long‐term ionospheric trends have been widely studied, but their origin and magnitude remain subjects of debate. This study quantifies the linear trend in the F2‐region critical frequency (foF2) and its local time dependence using observations from eight low‐latitude ionosonde stations.
D. Singh, S. R. Zhang, L. P. Goncharenko, I. S. Batista, A. J. Coster   +4 more
wiley   +1 more source

Excursions, Reversals, and Secular Variation: Different Expressions of a Common Mechanism?

Geochemistry, Geophysics, Geosystems
Fluctuations in the geomagnetic field occur over a broad range of timescales. Short‐period fluctuations are called secular variation, whereas excursions and reversals are viewed as anomalous transient events.
B. A. Buffett
doaj   +1 more source

Multipole Analysis. II. Geomagnetic Secular Variation [PDF]

Australian Journal of Physics, 1969
The method of multipole analysis described in Part I is applied to the Earth's magnetic field for various epochs between 1845 and 1965, allowing the geomagnetic secular variation to be illustrated by time trends in the multipole parameters. The rates of change of the multipole parameters are used to separate the secular variation into non.drifting ...
openaire   +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

Magma and Volatile Pathways Beneath Sakurajima Volcano From Self‐Potential, Helium Isotopes, and Broadband Magnetotellurics

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract At frequently erupting volcanoes, magma and volatiles ascend through established pathways, but the complete picture of their branching and supply system remains unclear. We integrated self‐potential (SP), broadband magnetotelluric (MT), and helium isotope observations to image magma and volatile pathways beneath Sakurajima Volcano.
K. Aizawa, T. Koyama, H. Hase, M. Uyeshima, H. Sumino   +4 more
wiley   +1 more source

Secular variations of the geomagnetic field on litosphere plates of the Earth

Геофизический журнал, 2018
The dependence of the value and sign of the geomagnetic secular variations (SV) refined of 3- and 11-year components on the position of observatories at different tectonic plates is investigated.
P. V. Sumaruk, T. P. Sumaruk
doaj   +1 more source

Did Open Solar Magnetic Field Increase during the Last 100 Years: A Reanalysis of Geomagnetic Activity [PDF]

, 2004
Long-term geomagnetic activity presented by the aa index has been used to show that the heliospheric magnetic field has more than doubled during the last 100 years. However, serious concern has been raised on the long-term consistency of the aa index and
Karinen, A., Martini, D., Mursula, K.
core   +2 more sources

Magnetic Signatures of a Plasma Wake Behind the Swarm Satellites

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract This study provides first observational evidence of a plasma wake behind ESA's Swarm satellites, manifesting itself by a brief magnetic field strength spike and bipolar field variations in transverse direction. These magnetic signatures occur only near the dip‐equator where the magnetic declination is close to zero.
Chao Xiong, Xinyi Rang, Hermann Lühr, Fan Yin   +3 more
wiley   +1 more source