Results 31 to 40 of about 545 (160)

IGRF candidates for 1980 and 1985

Physics of the Earth and Planetary Interiors, 1987
Abstract A tenth degree and order spherical harmonic model of the main geomagnetic field for 1980 has been derived using MAGSAT data supplemented by aeromagnetic vector data collected by the Project MAGNET aircraft. A secular variation model of degree and order 8 for 1982.5 based on magnetic observatory and repeat station measurements has also been ...
J.M. Quinn, D.J. Kerridge, D.R. Barraclough   +2 more
  +5 more sources

Bootstrapping Swarm and observatory data to generate candidates for the DGRF and IGRF-13

Earth, Planets and Space, 2020
As posted by the Working Group V of the International Association of Geomagnetism and Aeronomy (IAGA), the 13th generation of the International Geomagnetic Reference Field (IGRF) has been released at the end of 2019.
F. Javier Pavón-Carrasco, Santiago Marsal, J. Miquel Torta, Manuel Catalán, Fátima Martín-Hernández, J. Manuel Tordesillas   +5 more
doaj   +1 more source

Predictions of the geomagnetic secular variation based on the ensemble sequential assimilation of geomagnetic field models by dynamo simulations

Earth, Planets and Space, 2020
The IGRF offers an important incentive for testing algorithms predicting the Earth’s magnetic field changes, known as secular variation (SV), in a 5-year range. Here, we present a SV candidate model for the 13th IGRF that stems from a sequential ensemble
Sabrina Sanchez, Johannes Wicht, Julien Bärenzung   +2 more
doaj   +1 more source

Pemodelan Lapisan Batuan Bawah Permukaan Kawasan Panas Bumi Menggunakan Metode Geomagnetik (Studi Kasus di Wisata Air Putih, Kabupaten Lebong)

Wahana Fisika: Jurnal Penelitian Fisika dan Terapannya
Penelitian dengan metode geomagnetik di daerah panas bumi air putih Kabupaten Lebong dilakukan menggunakan alat PPM (Proton Precession Magnetometer) G856. Peta distribusi anomali medan magnet total dibuat dengan melewati tahapan reduksi dan koreksi data.
Eko Heru Purwanto, Andre Rahmat Al Ansory, Usman Gumanty, Desi Wulandari, Refrizon Refrizon, Hallaudin Hallaudin, Nanang Sugianto, Arif Ismul Hadi, M. Farid, Suhendra Suhendra, Budi Harlianto, Shela Basaria Purba, Ripal Zamrawi   +12 more
doaj   +1 more source

Evidence-based uncertainty estimates for the International Geomagnetic Reference Field

Earth, Planets and Space, 2022
The International Geomagnetic Reference Field (IGRF) is a multi-institute model of the Earth’s magnetic field, compactly described by sets of up to 195 spherical harmonic (Gauss) coefficients to degree and order 13, which allows the continuous evaluation
Ciarán D. Beggan
doaj   +1 more source

Comparison of candidate IGRF models.

Journal of geomagnetism and geoelectricity, 1982
Three candidate models for the International Geomagnetic Reference Field (IGRF) for the years 1965, 1970, 1975, and 1980 are evaluated using magnetic observatory and satellite data. The models were submitted by the USGS, the IGS, and NASA. Comparison based on annual means data shows the differences between models to be small, although the NASA model ...
LANGEL, R. A., ESTES, R. H.
openaire   +2 more sources

IZMIRAN candidate field model for IGRF-13

Earth, Planets and Space, 2021
The International Geomagnetic Reference Field (IGRF) model is a combination of the several models developed by independent groups of scientists using different approaches for the selection of input data and methods for calculating harmonic coefficients ...
Valeriy G. Petrov, Tatyana N. Bondar
doaj   +1 more source

Integrated Multi‐Physics Characterisation of the Northern Kiruna Mining District With Machine‐Learning‐Assisted Interpretation

Geophysical Prospecting, Volume 74, Issue 7, September 2026.
ABSTRACT Integrated earth modelling aims to combine all available geoscientific information to derive one common earth model. However, combining multiple parameters in a meaningful way remains challenging. In this study, we aim to improve mineral exploration workflows through the integration of new magnetotelluric data with other geophysical and ...
Oskar Rydman, Ervin Veress, Maxim Yu. Smirnov, Tobias E. Bauer, Thorkild M. Rasmussen, Niklas Juhojuntti   +5 more
wiley   +1 more source

Excitation of Large Amplitude Compressional ULF Waves in the Magnetosphere by Solar Wind Pressure Spikes and IMF Southward Turning

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We present a case study of large amplitude, compressional Pc5 waves observed by GOES 13 and 15 at geosynchronous orbit near noon. These waves were excited near the arrival time of two consecutive solar wind dynamic pressure spikes at the magnetopause, the second of which was associated with a large and rapid southward turning of the ...
C. Lazzeri, C. Forsyth, A. Samsonov, A. Fazakerley, M. Archer, T. Elsden, K. J. Trattner, J. Rae, A. W. Degeling   +8 more
wiley   +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