Results 91 to 100 of about 329,822 (248)

Thousand‐Kilometer‐Scale Wavelike Undulations in Ionospheric Plasma Bubble Lifetime and Development Over Wide Longitudes

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract The irregularities of ionospheric plasma bubbles (EPBs) sequentially generated over wide longitudes are expected to share similar lifetime under normal conditions. In this study, we report a special case where the EPB irregularity lifetime over wide longitudes showed a quasi‐wavelike undulation pattern with wavelength of ∼3,000 km, that is ...
Wenjie Sun, Yuichi Otsuka, Guozhu Li, Prayitno Abadi, Zequan Wang, Guofeng Dai, Lianhuan Hu, Biqiang Zhao, Jianfei Liu, Haiyong Xie, Xiukuan Zhao, Yi Li, Baiqi Ning, Atsuki Shinbori, Michi Nishioka, Septi Perwitasari   +15 more
wiley   +1 more source

Why dynamos are prone to reversals

, 2005
In a recent paper (Phys. Rev. Lett. 94 (2005), 184506; physics/0411050) it was shown that a simple mean-field dynamo model with a spherically symmetric helical turbulence parameter alpha can exhibit a number of features which are typical for Earth's ...
Bak, Berry, Berry, Bogue, Brandenburg, Clement, Consolini, Cox, Deinzer, Dembowski, Dudley, F. Stefani, Fuller, G. Gerbeth, Gailitis, Gailitis, Gailitis, Giesecke, Glatzmaier, Glatzmaier, Günther, Günther, Heller, Hoyng, Hoyng, Kato, Krause, Larson, Larson, Loper, Loper, Lorito, M. Xu, Meinel, Merrill, Meynadier, Mininni, Nakajima, Olson, Olson, Parker, Perrin, Plunian, Rikitake, Roberts, Roberts, Sarson, Schmitt, Schrinner, Seyranian, Shcherbakov, Stefani, Stefani, Tarduno, U. Günther, Valet, van der Pol, Vogt, Yamazaki, Yoshimura   +59 more
core   +1 more source

Surface Air Enrichment of Cosmogenic 35S at a Subtropical Site During the May 2024 Solar Superstorm

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract Cosmogenic radiosulfur (35S) is produced in the atmosphere by high‐energy particle interactions and serves as a sensitive tracer of stratospheric intrusions. In May 2024, an extreme solar storm provided a rare opportunity to examine atmospheric 35S responses to intense solar activity.
Xinling Zou, Lin Su, Zhisheng Zhang, Xiaomin Lin, Mang Lin   +4 more
wiley   +1 more source

Astronomically calibrated ages for geomagnetic reversals within the Matuyama chron

, 2002
We present a magnetostratigraphic record from the western Philippine Sea that is tied to a marine δ18O record for the past 2.14 million years. The ages of geomagnetic reversals were astronomically calibrated by tuning the oxygen isotopic stratigraphy ...
C. Horng, Meng-Yang Lee, H. Pälike, K. Wei, W. Liang, Y. Iizuka, M. Torii   +6 more
semanticscholar   +1 more source

Abrupt Disappearance of Plasmaspheric Hiss Inside the Magnetic Dip

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract Plasmaspheric hiss plays an important role in radiation belt electron dynamics, and its excitation and propagation have long attracted attention. During a substorm, Van Allen Probe B observed the disappearance of plasmaspheric hiss at the magnetic dip, which was driven by the injection of energetic protons.
Yan Zhuang, Chao Yue, Shan Wang, Haimeng Li, Sibo Xu, Xu‐Zhi Zhou, Qiu‐Gang Zong   +6 more
wiley   +1 more source

Reflections on geomagnetic reversals.

Journal of geomagnetism and geoelectricity, 1985
Several investigators have noted that the Earth's magnetic dipole has been decreasing during the last century. Some have indicated that if the trend continues the dipole would be zero within a few thousand years, indicating that a reversal was occurring. Few if any take such suggestions seriously because of the weakness of the conditional if clause. An
openaire   +2 more sources

Modelling fast geomagnetic reversals

, 2020
<div> <p>Field reversals are some of the most prominent and commonly known temporal variations of the geomagnetic field. Polarity changes have been observed in seafloor magnetisation patterns, volcanic records, sediment sequences, speleothem records, and have been reported in geodynamo simulations.
Stefano Maffei, Philip Livermore, Sam Greenwood, Jonathan Mound   +3 more
openaire   +1 more source

Global Dynamics of the Chaotic Disk Dynamo System Driven by Noise

Complexity, 2020
The disk dynamo system, which is capable of chaotic behaviours, is obtained experimentally from two disk dynamos connected together. It models the geomagnetic field and is used to explain the reversals in its polarity.
Chunsheng Feng, Lijie Li, Yongjian Liu, Zhouchao Wei   +3 more
doaj   +1 more source

How to control a temporary DIDD based observatory in the field?

Annals of Geophysics, 2013
One of the main challenges on the course of the repeat station surveys is to determine the spatial differences of the geomagnetic elements between the repeat stations and the reference observatory.
András Csontos, Danijel Šugar, Mario Brkić, Péter Kovács, László Hegymegi   +4 more
doaj   +1 more source

Geomagnetism, volcanoes, global climate change, and predictability. A progress report

Annals of Geophysics, 1994
A model is investigated, by which the encounters of the solar system with dense interstellar clouds ought to trigger either geomagnetic field reversals or excursions, that produce extra electric currents within the Earth dynamo, that cause extra Joule's ...
G. P. Gregori
doaj   +1 more source