Zobrazeno 1 - 10
of 2 900
pro vyhledávání: '"H. George"'
Autor:
J. Suni, M. Palmroth, L. Turc, M. Battarbee, G. Cozzani, M. Dubart, U. Ganse, H. George, E. Gordeev, K. Papadakis, Y. Pfau-Kempf, V. Tarvus, F. Tesema, H. Zhou
Publikováno v:
Annales Geophysicae, Vol 41, Pp 551-568 (2023)
Magnetosheath jets are plasma structures that are characterised by enhanced dynamic pressure and/or plasma velocity. In this study, we investigate the formation of magnetosheath jets in four two-dimensional simulation runs of the global magnetospheri
Externí odkaz:
https://doaj.org/article/2648ef58e4d7414b9e2744ac7b300bbd
Publikováno v:
Geophysical Research Letters, Vol 50, Iss 19, Pp n/a-n/a (2023)
Abstract The occurrence of Venusian lighting has been debated for decades. Terrestrial lightning generates whistler waves, and many whistlers have been observed in Venus's ionosphere and induced magnetosphere. Venusian lightning occurrence rates deri
Externí odkaz:
https://doaj.org/article/95cb2763b818480bb67fab2b31f9c49a
Autor:
K. Papadakis, Y. Pfau-Kempf, U. Ganse, M. Battarbee, M. Alho, M. Grandin, M. Dubart, L. Turc, H. Zhou, K. Horaites, I. Zaitsev, G. Cozzani, M. Bussov, E. Gordeev, F. Tesema, H. George, J. Suni, V. Tarvus, M. Palmroth
Publikováno v:
Geoscientific Model Development, Vol 15, Pp 7903-7912 (2022)
Numerical simulation models that are used to investigate the near-Earth space plasma environment require sophisticated methods and algorithms as well as high computational power. Vlasiator 5.0 is a hybrid-Vlasov plasma simulation code that is able to
Externí odkaz:
https://doaj.org/article/d52aceff34024ddca9e69e0e6f3f48bd
Autor:
H. George, A. Osmane, E. K. J. Kilpua, S. Lejosne, L. Turc, M. Grandin, M. M. H. Kalliokoski, S. Hoilijoki, U. Ganse, M. Alho, M. Battarbee, M. Bussov, M. Dubart, A. Johlander, T. Manglayev, K. Papadakis, Y. Pfau-Kempf, J. Suni, V. Tarvus, H. Zhou, M. Palmroth
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
Radial diffusion coefficients quantify non-adiabatic transport of energetic particles by electromagnetic field fluctuations in planetary radiation belts. Theoretically, radial diffusion occurs for an ensemble of particles that experience irreversible
Externí odkaz:
https://doaj.org/article/039fd5f5c83145cf9540e66b06ed0712
The inflation of an inner radial (or spherical) cavity in an amorphous solids confined in a disk (or a sphere), served as a fruitful case model for studying the effects of plastic deformations on the mechanical response. It was shown that when the fi
Externí odkaz:
http://arxiv.org/abs/2406.16075
Autor:
H. George, E. Kilpua, A. Osmane, T. Asikainen, M. M. H. Kalliokoski, C. J. Rodger, S. Dubyagin, M. Palmroth
Publikováno v:
Annales Geophysicae, Vol 38, Pp 931-951 (2020)
Recently, it has been established that interplanetary coronal mass ejections (ICMEs) can dramatically affect both trapped electron fluxes in the outer radiation belt and precipitating electron fluxes lost from the belt into the atmosphere. Precipitat
Externí odkaz:
https://doaj.org/article/a8b5f3ec519d4db29ab9f9529616edc3
Autor:
M. M. H. Kalliokoski, E. K. J. Kilpua, A. Osmane, D. L. Turner, A. N. Jaynes, L. Turc, H. George, M. Palmroth
Publikováno v:
Annales Geophysicae, Vol 38, Pp 683-701 (2020)
The energetic electron content in the Van Allen radiation belts surrounding the Earth can vary dramatically at several timescales, and these strong electron fluxes present a hazard for spacecraft traversing the belts. The belt response to solar wind
Externí odkaz:
https://doaj.org/article/e2534d5591e84130a08a65faf85cc957
Autor:
E. Kilpua, L. Juusola, M. Grandin, A. Kero, S. Dubyagin, N. Partamies, A. Osmane, H. George, M. Kalliokoski, T. Raita, T. Asikainen, M. Palmroth
Publikováno v:
Annales Geophysicae, Vol 38, Pp 557-574 (2020)
We study here energetic-electron (E>30 keV) precipitation using cosmic noise absorption (CNA) during the sheath and ejecta structures of 61 interplanetary coronal mass ejections (ICMEs) observed in the near-Earth solar wind between 1997 and 2012. T
Externí odkaz:
https://doaj.org/article/028c4c7bae7c4a6593928549ed40792e
In recent work, it was shown that elasticity theory can break down in amorphous solids subjected to nonuniform {\em static} loads. The elastic fields are screened by geometric dipoles; these stem from gradients of the quadrupole field associated with
Externí odkaz:
http://arxiv.org/abs/2312.12875
The ``Eshelby problem" refers to the response of a 2-dimensional elastic sheet to cutting away a circle, deforming it into an ellipse, and pushing it back. The resulting response is dominated by the so-called ``Eshelby Kernel" which was derived for p
Externí odkaz:
http://arxiv.org/abs/2309.13603