Results 31 to 40 of about 537 (162)

Evaluación preliminar del campo geomagnético de referencia internacional IGRF-1990 para México y anomalías magnéticas corticales

Geofísica Internacional, 1994
Se reporta una comparación regional entre el International Geomagnetic Reference Field (IGRF) para 1990 y medidas geomagneticas de campo obtenidas en 51 localidades del pais.
E. Hernández-Quintero, H. Nolasco-Chavez, J. O. Campos-Enríquez, C. Cañón-Amaro, A. Orozco Torres, J. Urrutia-Fucugauchi, G. Álvarez-García   +6 more
doaj   +1 more source

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

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

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

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

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

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

A candidate secular variation model for IGRF-13 based on MHD dynamo simulation and 4DEnVar data assimilation

Earth, Planets and Space, 2020
We have submitted a secular variation (SV) candidate model for the thirteenth generation of International Geomagnetic Reference Field model (IGRF-13) using a data assimilation scheme and a magnetohydrodynamic (MHD) dynamo simulation code.
Takuto Minami, Shin’ya Nakano, Vincent Lesur, Futoshi Takahashi, Masaki Matsushima, Hisayoshi Shimizu, Ryosuke Nakashima, Hinami Taniguchi, Hiroaki Toh   +8 more
doaj   +1 more source

Araguainha Dome, Brazil: A polygonal impact structure due to a complex pre‐impact regional structural framework

Meteoritics &Planetary Science, EarlyView.
Abstract We investigated the structural framework of the north–northwestern Paraná Basin in Brazil to test whether the pre‐impact structures in this region may have had any influence on the first‐order formation and morphostructure of the Araguainha impact structure (AIS).
Renato B. Bernardes, Wolf U. Reimold, Roger L. Gibson, Julia B. Curto Ma, Adolfo B. Silva, Natalia Hauser   +5 more
wiley   +1 more source