Results 61 to 70 of about 243,128 (206)

New geomagnetic field observations in the South Atlantic Anomaly region

Annals of Geophysics, 2009
Three new geomagnetic observatories have been established recently around the South Atlantic geomagnetic<br />Anomaly by GeoForschungsZentrum Potsdam(GFZ), Germany, in collaboration with other institutions.
Pieter Kotzé, Anne Hemshorn, Hans-Joachim Linthe, Mioara Mandea, Monika Korte, Edgard Ricaldi   +5 more
doaj   +1 more source

OI 630 nm Airglow Observed From Space as a Diagnostic of Nighttime Low‐Latitude Ionospheric Dynamics

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This study investigates the nighttime morphology of the bottomside F region (∼250 km) at low latitudes using 630 nm airglow measurements from the Visible and Infrared Spectral Imager (VISI) aboard the Ionosphere, Mesosphere, Upper Atmosphere, and Plasmasphere (IMAP) mission on the International Space Station. For this purpose, we analyzed IMAP/
Hyosub Kil, Se‐Heon Jeong, Jeong‐Heon Kim, Woo Kyoung Lee, Young‐Sil Kwak, Akinori Saito, Takeshi Sakanoi   +6 more
wiley   +1 more source

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
openaire   +1 more source

Geomagnetic observatories threatened again

Eos, Transactions American Geophysical Union, 1987
In its fiscal year (FY) 1988 budget, the U.S. Geological Survey (USGS) is again proposing to close two geomagnetic observatories (Eos, February 10, 1987, p. 78). Reliable sources have indicated to us that one of the contemplated closings is of an Alaskan observatory.
L. J. Lanzerotti, A. D. Chave
openaire   +1 more source

ITalian Geomagnetic Reference Field (ITGRF): update for 2000 and secular variation model up to 2005 by autoregressive forecasting

Annals of Geophysics, 2003
The updated version of the ITalian Geomagnetic Reference Field (ITGRF) for 2000.0 and its secular variation model up to 2005.0 are presented in this paper.
J. M. Torta, A. Meloni, G. Dominici, L. Gaya-Piqué, A. De Santis, R. Tozzi   +5 more
doaj   +1 more source

Nighttime Westward Equatorial Electrojet Observed During the January 2026 Geomagnetic Storm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract The equatorial electrojet (EEJ) is a narrow band of zonal electric current flowing in the E‐region ionosphere within approximately ±2° $\pm 2{}^{\circ}$ latitude of the magnetic equator. At night, the EEJ is generally considered very weak because of low ionospheric conductivity.
Y. Yamazaki, M. V. da Silva, J. Matzka, G. B. Soares, A. Grayver, D. R. Themens, S. K. Das, C. Stolle, A. Maute, S. Perwitasari, M. Nishioka, R. Kaewthongrach, S. Channumsin, Y. Setiawan, M. Syirojudin, X. Yue, A. Yoshikawa, S. Abe, K. Girgis, R. Flores, F. Justo, J. Inostroza, G. Vichare, G. Seemala, A. Nel, N. M. Giday, A. Samy   +26 more
wiley   +1 more source

A sign of the dayside current wedge in geomagnetic observations at Stará Ďala (present-day Hurbanovo) on 16 April 1938

Contributions to Geophysics and Geodesy
The recently proposed dayside current wedge likely explains the mechanism behind the well-known Carrington geomagnetic storm on 2 September 1859, as well as an event observed in Europe on 29 October 2003. Both events were swift and intense, had unusually
Eduard KOČI, Fridrich VALACH
doaj   +1 more source

Secular trends in storm-level geomagnetic activity [PDF]

Annales Geophysicae, 2011
Analysis is made of K-index data from groups of ground-based geomagnetic observatories in Germany, Britain, and Australia, 1868.0–2009.0, solar cycles 11–23.
J. J. Love
doaj   +1 more source

Transition of Glacial Regimes Recorded at IODP Site U1524 in the Ross Sea, Antarctica, Over the Last 800 Thousand Years

Paleoceanography and Paleoclimatology, Volume 41, Issue 10, October 2026.
Abstract Reconstructing past interactions between the West Antarctic Ice Sheet (WAIS) and changing environmental conditions in the Ross Sea region can help determine long‐term WAIS stability. Existing sedimentary records reveal changes to oceanography, sea ice and ice sheet extent over the glacial‐interglacial cycles of the last ∼800 kyr.
J. W. Marschalek, T. van de Flierdt, M. O. Patterson, G. Grant, S. Kim, W. Xiao, Q. Li, G. Cortese, S. Bombard, R. M. Leckie, H. Ishii, T. van Peer, C. Xuan, S. Sugisaki, J. Müller, D. Kaufman, D. K. Kulhanek, K. J. Licht, S. R. Hemming, O. Seki, E. Colizza, F. Torricella, J. Gales, B. W. Romans, N. Varela, L. De Santis, R. M. McKay   +26 more
wiley   +1 more source

Protection against lightning at a geomagnetic observatory [PDF]

Geoscientific Instrumentation, Methods and Data Systems, 2014
Abstract. The Sinji Vrh Geomagnetic Observatory was built on the brow of Gora, the mountain above Ajdovščina, which is a part of Trnovo plateau, and all over Europe one can hardly find an area which is more often struck by lightning than this southwestern part of Slovenia.
R. Čop, G. Milev, D. Deželjin, J. Kosmač   +3 more
openaire   +3 more sources