Results 41 to 50 of about 1,592 (183)

On the possibility of extending the IGRF predictive secular variation model to a higher SH degree [PDF]

, 2010
The International Geomagnetic Reference Field (IGRF) is an internationally agreed global spherical harmonic model of the Earth's magnetic field of internal origin.
Maus, Stefan, Silva, Luís, Thébault, Erwan, Luís Silva, Hulot, Gauthier, Gauthier Hulot, Erwan Thébault, Stefan Maus   +7 more
core   +1 more source

Kajian Sebaran Air Panas di Kelurahan Tobololo dan Kelurahan Sulamadaha Kecamatan Pulau Ternate Kota Ternate

Jurnal Ilmiah Pendidikan Fisika Al-Biruni, 2015
Tujuan dari penelitian ini adalah untuk mengetahui potensi panas bumi dan sebaran air panas di sekitar Kelurahan Tobololo dan Kelurahan Sulamadaha, Pulau Ternate bagian utara.
Abdul Haris Rajab, Rohima Wahyu Ningrum, Jumaris Jumaris   +2 more
doaj   +1 more source

Impact of Realistic Detector Response and Azimuthal Drift on the Quantification of Energetic Electron Precipitation Using POES/MetOp

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract Quantifying energetic electron precipitation is essential for understanding ring current and radiation belt loss, as well as magnetosphere‐ionosphere‐atmosphere coupling. The count rate ratio between the 90° and 0° telescopes (CR90/CR0) on POES/MetOp satellites is a commonly used proxy for precipitation and pitch‐angle diffusion rates (DW ${D ...
Weichao Tu, Zhi‐Gu Li
wiley   +1 more source

The Aurora Vent Field at the Transition From Magmatic Accretion to Tectonic Extension on Gakkel Ridge: Constraints From Microseismicity and Aeromagnetic Observations

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.
Abstract The Aurora hydrothermal vent field (AVF) is the first confirmed active vent system on the Arctic Ocean seafloor, located at the western end of the ultraslow spreading Gakkel Ridge. It marks a distinctive endmember among ridge‐axis hydrothermal systems, where volcanic construction and ultramafic influence co‐exist.
Matthias Pilot, Mechita C. Schmidt‐Aursch, Graeme Eagles, Vera Schlindwein   +3 more
wiley   +1 more source

Dynamic Evolution of a Storm‐Time “Super‐EPB” Event Over China on the Magnetically Disturbed Night of 01 December 2023

Space Weather, Volume 24, Issue 10, October 2026.
Abstract This paper investigates the dynamic evolution of a storm‐time “Super‐EPB” event over China on 1 December 2023 (Kp ≤ 7, SYM/H ≥ −130 nT) using multi‐instrument observations. Occurring near sunset as the IMF‐Bz abruptly turned southward, with auroral extension to midlatitudes, the “Super‐EPB” extended to 40°N with an apex height of ∼2,460 km ...
Longchang Sun, Jiyao Xu, Wei Yuan, Yajun Zhu, Maosheng He, Wenjie Sun, Guozhu Li, Jiaojiao Zhang, Hong Gao, Aibin Zhang, Weijun Liu, Guojun Wang   +11 more
wiley   +1 more source

Global Implications of Terrain‐Induced Bias in Paleomagnetic Data From 3D Forward Modeling of Mt. Etna

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.
Abstract In paleomagnetism, records of paleosecular variation (PSV) on centennial timescales are often based on magnetic measurements from lava flows. However, samples from recent flows that cooled in known magnetic fields often fail to produce the expected paleomagnetic directions, and samples from the same flow often show large within‐ and between ...
A. E. Hendrickx, C. Thieulot, L. V. de Groot   +2 more
wiley   +1 more source

Evaluation of candidate geomagnetic field models for IGRF-12 [PDF]

, 2015
Background: The 12th revision of the International Geomagnetic Reference Field (IGRF) was issued in December 2014 by the International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group V-MOD (http://www.ngdc.noaa.gov/IAGA/vmod ...
Lesur, Vincent, Beggan, Ciaran, C, Schachtschneider, Reyko, Beggan, Ciaran D., Manoj, Chandrasekharan, Lowes, Frank, J, Rother, Martin, Finlay, Christopher C., Finlay, Chris, Thébault, Erwan, Finlay, Christopher, C, Canet, Elisabeth, C, Chulliat, Arnaud, C, Chulliat, Arnaud, Langlais, Benoit, Lowes, Frank J., Alken, Patrick, Canet, Elisabeth   +17 more
core   +1 more source

The problem with IGRF commercialization

Eos, Transactions American Geophysical Union, 1991
I wish to comment on the news item, “Geomagnetic Reference Field: To License or Not to License?,” by Stuart and others, which appeared in the February 19 issue of Eos. It is important to recall some of the history of establishing an International Geomagnetic Reference Field (IGRF) and the conditions that prevailed before the field was standardized ...
openaire   +1 more source

Coordinate Systems and Transforms in Space Physics: Terms, Definitions, Implementations, and Recommendations for Reproducibility

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract In space physics, acronyms for coordinate systems (e.g., GEI, GSM) are commonly used; however, differences in their definitions and implementations can prevent reproducibility. In this work, we compare definitions in online resources, software packages, and frequently cited journal articles and show that implementation differences can lead to ...
R. S. Weigel, A. Y. Shih, R. Ringuette, I. Christopher, S. M. Petrinec, S. Turner, R. M. Candey, G. K. Stephens, B. Cecconi   +8 more
wiley   +1 more source

New IGRF computer program

Eos, Transactions American Geophysical Union, 1969
A Fortran II Computer program has been developed by the U.S. Coast and Geodetic Survey to compute the International Geomagnetic Reference Field (IGRF) for any geographic position. To facilitate the portrayal and comparison of magnetic anomalies, the IGRF is used as a common datum for removal of regional gradients from magnetic survey measurements. This
openaire   +1 more source