Results 41 to 50 of about 1,055 (183)

On closing geomagnetic observatories

Eos, Transactions American Geophysical Union, 1986
The contemplated closing by the U.S. Geological Survey (USGS) of the geomagnetic observatories at Barrow, Alaska, and Newport, Wash. (Eos, February 25, 1986, p. 95) is a situation that could have very serious implications for the solar‐terrestrial research community as well as for the geological community.This intent to close should be investigated ...
openaire   +1 more source

Longitudinal Variation of Ionospheric Irregularities and Response of the Ionosphere During 10–13 May and 10–13 October 2024 Geomagnetic Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We examine the response of the ionosphere to the 10–13 May 2024 and 10–13 October 2024 geomagnetic storms, the two recent great geomagnetic storms of solar cycle 25. We identified the occurrence of ionospheric irregularities during the two geomagnetic storms.
Valence Habyarimana, Mark B. Moldwin, John Bosco Habarulema, Sharon Aol, Jean Claude Uwamahoro, Teshome Dugassa, Daniel Okoh, Solomon Otoo Lomotey   +7 more
wiley   +1 more source

The Analysis of Baselines for Different Fluxgate Theodolites of Geomagnetic Observatories

Data Science Journal, 2011
This paper analyzes the baselines of 8 geomagnetic observatories in the China Magnetic Observatory Network. The baselines of similar variometers were measured by two different fluxgate theodolites during the same time period. The results demonstrate that
Xin Changjiang, Suqin Zhang
doaj   +1 more source

Near‐Earth Solar Wind Speed of Fast Coronal Mass Ejections

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Using solar wind and ground magnetometer data for solar cycles 23–25, extreme‐value power‐law models are developed that quantify relationships between near‐Earth solar wind speed and Sun‐to‐Earth transit times of interplanetary coronal mass ejections (ICMEs).
Jeffrey J. Love, Ian G. Richardson, E. Joshua Rigler, Kalevi Mursula   +3 more
wiley   +1 more source

Peculiarities of the geomagnetic field secular variations at the 20th solar activity cycle

Геофизический журнал, 2018
The decrease of solar and; correspondingly; geomagnetic activities at the 20th cycle has reflected on the secular variations of the geomagnetic field. On the continental magnetic observatories of the Earth north hemisphere (Europe and North America) the
T. P. Sumaruk, P. V. Sumaruk
doaj   +1 more source

Statistical Survey of Cosmic Noise Absorption in Conjunction With Plasma Wave Measurements

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Using a decade of observations from the Canadian Geospace Observatory Riometer Network (GO‐RIO), we selected an east‐west subset of stations near L∼7 $L\sim 7$ to classify cosmic noise absorption (CNA) (a proxy for enhanced D‐region ionization) into two morphologies, simultaneous and drifting, based on the relative timing of signals across the
R. Ghaffari, C. M. Cully, E. Spanswick, R. A. D. Fiori   +3 more
wiley   +1 more source

Historical evolution of the geomagnetic declination at the Royal Observatory of Madrid [PDF]

History of Geo- and Space Sciences
The agonic line, which represents geomagnetic declinations of 0°, recently crossed the Royal Observatory of Madrid (ROM) in December 2021, causing a shift in declination values from west to east.
J. M. Tordesillas, J. M. Tordesillas, F. J. Pavón-Carrasco, F. J. Pavón-Carrasco, A. Nuñez, A. B. Anquela   +5 more
doaj   +1 more source

Features and Source Current of Long‐Period Induced Geoelectric Field During Magnetic Storms: A Case Study

Space Weather, 2020
We present a case study on the long‐period ( >105 s) induced geoelectric field disturbance during magnetic storms. A set of continuous 33‐day measurements of the geoelectric field, geomagnetic field, geomagnetic indices, and interplanetary magnetic field
S. Y. Wu, S. Yao, X. D. Feng, W. B. Wei, Y. T. Yin, L. T. Zhang, H. Dong, G. W. Wang, J. L. Liu, Y. Q. Yu, D. Wei   +10 more
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Geomagnetic study in the area of the constructed geomagnetic observatory in Tosontsengel

Mongolian Journal of Astronomy and Geophysics
This study systematically investigated how a 1-hectare site selected in Tosontsengel soum meets international standards for constructing a geomagnetic observatory. We measured the geomagnetic field exactly along the predefined profiles at the site before and after construction, produced maps showing the distribution of anomalous geomagnetic fields, and
Bayanjargal Gendenpuntsag, Nasan-Ochir Tumen, Munkhbat Dagva, Bat-Erdene Nyamdorj, Mungunbagana Sangidalai, Dolgorjav Todgerel, Tuul Chinzorig   +6 more
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Latitude Survey of Neutrons and Muons to Determine Cosmic Ray Neutron Sensing Yield Functions

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Cosmic Ray Neutron Sensing (CRNS) is a ground‐based technique that utilizes epithermal neutron measurements as a proxy for environmental hydrogen content. Similarly to other ground‐based cosmic ray detectors (e.g., neutron monitors), CRNS detectors are affected by the solar cycle and space weather events.
Lasse Hertle, Fraser Baird, Ulrich Schmidt, Bernd Heber, Michael Walter, Nora Krebs, Paul Schattan, Pauli Väisänen, Peter Dietrich, Steffen Zacharias, Solveig Landmark, Daniel Rasche, Marco Kossatz, Gary Womack, Steve Hamann, Enrico Gazzola, Martin Schrön   +16 more
wiley   +1 more source