Results 61 to 70 of about 13,437 (258)

Plio-Pleistocene time-averaged field in southern Patagonia recorded in lava flows [PDF]

, 2004
Paleomagnetic directions were obtained from stepwise alternating-field or thermal demagnetization of 53 lava flows from southern Patagonia (latitudes 49.5°-52.1 °S) that include the Pali-Aike volcanic field and the Meseta Viscachas plateau lavas.
Mejia, V., Opdyke, N. D., Singer, B. S., Stoner, J. S., Vilas, Juan Francisco A.   +4 more
core   +1 more source

Ionospheric Effects on Maximum Usable Frequency for a Cross‐Auroral and a Polar Cap HF Radio Link

Radio Science, Volume 61, Issue 5, May 2026.
Abstract Maximum usable frequency (MUF) is an important indicator of the ability of the ionosphere to support over‐the‐horizon propagation of high frequency (HF) radio waves. MUF depends on the location of the transmitter and receiver, and the structure of ionospheric electron density.
T. G. Cameron, K. W. Reiter, R. A. D. Fiori   +2 more
wiley   +1 more source

Effects of Solar Variability on Tropical Cyclone Activity

Earth and Space Science
The current study explores the relationship between solar variability and tropical cyclone (TC) activity using sunspot number (SSN) and TC best‐track data as respective proxies.
Chinmaya Nayak, Jayashree Bulusu, Geeta Vichare, A. P. Dimri   +3 more
doaj   +1 more source

Testing the use of viscous remanent magnetisation to date flood events [PDF]

, 2015
© 2015 Muxworthy, Williams and Heslop. Using erratics associated with large flood events, this paper assesses whether their viscous remanent magnetisation (VRM) can be used to date the flood events.
Heslop, D, Muxworthy, AR, Williams, J
core   +2 more sources

GIC‐Related Observations During the May 2024 Geomagnetic Storm in the United States

Space Weather, Volume 24, Issue 5, May 2026.
Abstract The May 2024 geomagnetic storm was one of the most severe in the past 20 years. Understanding how large geomagnetic disturbances (GMDs) impact geomagnetically induced currents (GICs) within electrical power grid networks is key to ensuring their resilience.
L. A. Wilkerson, R. S. Weigel, D. Thomas, D. Bor, E. J. Oughton, C. T. Gaunt, C. C. Balch, M. J. Wiltberger, A. Pulkkinen   +8 more
wiley   +1 more source

Large Geomagnetically Induced Currents at Equator Caused by an Interplanetary Magnetic Cloud

Space Weather, 2022
Here, we report a rare observation of an extremely large and rapid change of geomagnetic field (dB/dt), a proxy for the geomagnetically induced currents (GICs), at the equator caused by a sudden drop in solar wind density at the front boundary of a ...
B. Nilam, S. Tulasi Ram
doaj   +1 more source

A High‐Efficiency Multivariable TEC‐SOFTS Model for Ionospheric TEC Prediction: Validation Over China Area During Low and High Solar Activity Periods

Space Weather, Volume 24, Issue 5, May 2026.
Abstract The ionospheric Total Electron Content (TEC) is a key parameter for characterizing the ionospheric properties. In this study, an efficient multivariable time series prediction model, TEC‐Series Core Fusion and efficient multivariable time series (TEC‐SOFTS), was constructed by combining multiple geomagnetic and solar activity indices ...
Chen Chen, Ling Huang, Wenwen Li, Dezhong Chen, Hongping Zhang, Yidong Lou, Lv Zhou   +6 more
wiley   +1 more source

Seasonal variabilities of low-latitude mesospheric winds [PDF]

Annales Geophysicae, 1998
Observations of mesospheric winds over a period of four years with the partial reflection radar at Tirunelveli (8.7°N, 77.8°E), India, are presented in this study. The emphasis is on describing seasonal variabilities in mean zonal and meridional winds
R. Rajaram, R. Rajaram, S. Gurubaran
doaj   +1 more source

Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities

, 2011
We investigate the relationship between the monthly averaged maximal speeds of coronal mass ejections (CMEs), international sunspot number (ISSN), and the geomagnetic Dst and Ap indices covering the 1996-2008 time interval (solar cycle 23).
A. Kilcik, A. Ozguc, Abramenko, Abramenko, Box, Durbin, Gopalswamy, Gopalswamy, Gopalswamy, J. P. Rozelot, Kilcik, Legrand, Luhmann, Moon, N. Gopalswamy, P. R. Goode, Qiu, Ramesh, Sugiura, V. Abramenko, V. B. Yurchyshyn, Zhang   +21 more
core   +3 more sources

Geomagnetic survey and geomagnetic model research in China [PDF]

Earth, Planets and Space, 2006
Abstract The geomagnetic survey at 135 stations in China were carried out in 2003. These stations are with better environmental condition and small magnetic field gradient (<5 nT/m). In the field survey, the geomagnetic declination D, the inclination I and the total intensity F were measured.
Gu, Zuowen, Zhan, Zhijia, Gao, Jintian, Han, Wei, An, Zhenchang, Yao, Tongqi, Chen, Bin   +6 more
openaire   +1 more source