Results 71 to 80 of about 31,676 (285)

What happens when the geomagnetic field reverses?

, 2012
During geomagnetic field reversals the radiation belt high-energy proton populations become depleted. Their energy spectra become softer, with the trapped particles of highest energies being lost first, and eventually recovering after a field reversal ...
Akasofu, Alfvén, Alfvén, Dragt, Dragt, Dungey, Glassmeier, Griem, Horne, Jackman, Kirkby, Lemaire, Lemaire, McIlwain, McIlwain, McIlwain, McIlwain, McIlwain, Northrop, Singer, Singer, Singer, Singer, Singer, Singer, Smart, Smart, Stadelmann, Störmer, Störmer, Störmer, Svensmark, Uffen, Van Allen, Van Allen, Van Allen, Vernov, Vogt, Vogt, Vogt, Walt, Zieger, Zieger   +42 more
core   +1 more source

Principal component analysis as a tool to extract Sq variation from the geomagnetic field observations: Conditions of applicability

MethodsX, 2023
We analyzed the applicability of the principal component analysis (PCA) as a tool to extract the Sq variation of the geomagnetic field (GMF) taking into account different geomagnetic field components, data measured at different levels of the solar and ...
Anna Morozova, Rania Rebbah
doaj   +1 more source

Systematic Approach for Carbonate and Volcanic Facies Classification Based on Textural and Structural Variations Observed in Brazilian Pre‐Salt Acoustic Image Logs

Journal of Petroleum Geology, EarlyView.
ABSTRACT Facies characterization in carbonate reservoirs remains challenging due to their pronounced textural and structural heterogeneity. Variations in grain packing, cementation, and diagenetic overprints produce contrasting acoustic responses in borehole image logs, often limiting the reproducibility of facies interpretation.
Lenita de Souza Fioriti, Rodrigo César Teixeira de Gouvêa, Cleyton de Carvalho Carneiro   +2 more
wiley   +1 more source

Prediction of Dst during solar minimum using in situ measurements at L5

, 2020
Geomagnetic storms resulting from high-speed streams can have significant negative impacts on modern infrastructure due to complex interactions between the solar wind and geomagnetic field.
Amerstorfer, T., Amerstorfer, U. V., Bailey, R. L., Hinterreiter, J., Leonhardt, R., Magnes, W., Möstl, C., Reiss, M. A., Weiss, A. J.   +8 more
core   +1 more source

The Challenge of Machine Learning in Space Weather Nowcasting and Forecasting [PDF]

, 2019
The numerous recent breakthroughs in machine learning (ML) make imperative to carefully ponder how the scientific community can benefit from a technology that, although not necessarily new, is today living its golden age.
Andrejková G., Ashmall J., Bergstra J., E. Camporeale, Fasshauer G. E., Gelman A., Goodfellow I., Murphy K. P., Parnowski A., Pedregosa F., Pesnell W. D., Russell S. J., Semeniv O., Stepanova M., Stringer G., Sutton R. S., Turner D., Valach F., Vapnik V., Vega‐Jorquera P.   +19 more
core   +2 more sources

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta, Neivaldo Araújo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferrière, Wolf Uwe Reimold, Ana Maria Góes, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco   +9 more
wiley   +1 more source

Magnetospheric response to magnetosheath pressure pulses: A low pass filter effect [PDF]

, 2013
. We present observations from the magnetopause to the ground during periods of large amplitude, transient dynamic pressure pulses in the magnetosheath.
Archer, MO, Eastwood, JP, Horbury, TS, Weygand, JM, Yeoman, TK   +4 more
core   +1 more source

A new high-resolution geomagnetic field model for southern Africa

South African Journal of Science
Earth’s magnetic field is a dynamic, changing phenomenon. The geomagnetic field consists of contributions from several sources, of which the main field originating in Earth’s core makes up the bulk.
Amore E. Nel, Achim Morschhauser, Foteini Vervelidou, Jürgen Matzka   +3 more
doaj   +1 more source

Magnetic properties of geraisites, the first tektite strewn field identified in Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract Geraisites are a newly recognized class of tektite from Brazil. They occur as centimeter‐sized, elongated to subspherical bodies scattered across surface gravel and shallow subsurface layers within a ~90‐km‐long strewn field extending between the municipalities of São João do Paraíso and Curral de Dentro, near the border between the states of ...
Melissa De Andrade Nunes, Ricardo I. F. Trindade, João Pedro Rodriguez Pinto, Alvaro P. Crósta, Gabriel G. Silva, Ludovic Ferrière, Camila R. Sales, Giovanna M. Tosi   +7 more
wiley   +1 more source

B-Lspace and geomagnetic field models [PDF]

Journal of Geophysical Research, 1968
Geomagnetic field models compared in magnetic field strength-earth distance coordinates /B-L space/, noting geomagnetically trapped radiation flux ...
Lindstrom, Peter J., Heckman, Harry H.
openaire   +2 more sources