Zobrazeno 1 - 10
of 8 211
pro vyhledávání: '"S. Nakano"'
Publikováno v:
Annales Geophysicae, Vol 41, Pp 529-539 (2023)
The relationship between solar-wind conditions and substorm activity is modelled with an approach based on an echo state network. Substorms are a fundamental physical phenomenon in the magnetosphere–ionosphere system, but the deterministic predicti
Externí odkaz:
https://doaj.org/article/5fdbe4f8acc64948b71cdef97b23c37a
Autor:
S. Nakano, R. Kataoka
Publikováno v:
Annales Geophysicae, Vol 40, Pp 11-22 (2022)
The properties of the auroral electrojets are examined on the basis of a trained machine-learning model. The relationships between solar-wind parameters and the AU and AL indices are modeled with an echo state network (ESN), a kind of recurrent neura
Externí odkaz:
https://doaj.org/article/54ad739c36f04afebe4864eabcf88f63
Autor:
S. Nakano
Publikováno v:
Nonlinear Processes in Geophysics, Vol 28, Pp 93-109 (2021)
The behavior of the iterative ensemble-based data assimilation algorithm is discussed. The ensemble-based method for variational data assimilation problems, referred to as the 4D ensemble variational method (4DEnVar), is a useful tool for data assimi
Externí odkaz:
https://doaj.org/article/5852e415d6f8485c983c2c8fde1d061f
Autor:
P. Alken, E. Thébault, C. D. Beggan, H. Amit, J. Aubert, J. Baerenzung, T. N. Bondar, W. J. Brown, S. Califf, A. Chambodut, A. Chulliat, G. A. Cox, C. C. Finlay, A. Fournier, N. Gillet, A. Grayver, M. D. Hammer, M. Holschneider, L. Huder, G. Hulot, T. Jager, C. Kloss, M. Korte, W. Kuang, A. Kuvshinov, B. Langlais, J.-M. Léger, V. Lesur, P. W. Livermore, F. J. Lowes, S. Macmillan, W. Magnes, M. Mandea, S. Marsal, J. Matzka, M. C. Metman, T. Minami, A. Morschhauser, J. E. Mound, M. Nair, S. Nakano, N. Olsen, F. J. Pavón-Carrasco, V. G. Petrov, G. Ropp, M. Rother, T. J. Sabaka, S. Sanchez, D. Saturnino, N. R. Schnepf, X. Shen, C. Stolle, A. Tangborn, L. Tøffner-Clausen, H. Toh, J. M. Torta, J. Varner, F. Vervelidou, P. Vigneron, I. Wardinski, J. Wicht, A. Woods, Y. Yang, Z. Zeren, B. Zhou
Publikováno v:
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-25 (2021)
Abstract In December 2019, the International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group (V-MOD) adopted the thirteenth generation of the International Geomagnetic Reference Field (IGRF). This IGRF updates the previous ge
Externí odkaz:
https://doaj.org/article/74260ca58a794f5f8fba606014ac7852
Publikováno v:
Earth, Planets and Space, Vol 72, Iss 1, Pp 1-13 (2020)
Abstract A technique for estimating a plasma drift velocity distribution in the ionosphere is presented. This technique is based on a framework for representing a global vector field on a sphere by using a set of localized basis functions which is ne
Externí odkaz:
https://doaj.org/article/2dfc3734b2ab48b298be1b8ef1d19a9d
Publikováno v:
Pulmonology, Vol 27, Iss 1, Pp 81-83 (2021)
Externí odkaz:
https://doaj.org/article/1a907978883a4ef494c3e5fad8638ee0
Publikováno v:
Nonlinear Processes in Geophysics, Vol 23, Iss 1, Pp 31-44 (2016)
A technique for estimating the age–depth relationship in an ice core and evaluating its uncertainty is presented. The age–depth relationship is determined by the accumulation of snow at the site of the ice core and the thinning process as a resul
Externí odkaz:
https://doaj.org/article/ef54fdbc9c6e485c88aa2ed731d0d1b7
Autor:
S. Nakano, T. Higuchi
Publikováno v:
Annales Geophysicae, Vol 30, Pp 153-162 (2012)
The Dst index has a long-term variation that is not associated with magnetic storms. We estimated the long-term non-storm component of the Dst variation by removing the short-term variation related to magnetic storms. The results indicate that th
Externí odkaz:
https://doaj.org/article/5f9c87c78fa647d29a5473540dc347c0
Publikováno v:
Nonlinear Processes in Geophysics, Vol 14, Iss 4, Pp 395-408 (2007)
A new filtering technique for sequential data assimilation, the merging particle filter (MPF), is proposed. The MPF is devised to avoid the degeneration problem, which is inevitable in the particle filter (PF), without prohibitive computational cost.
Externí odkaz:
https://doaj.org/article/4ffbdd6d02334b469c33c9e4edc71a87
Publikováno v:
Molecules, Vol 9, Iss 9, Pp 792-807 (2004)
A possible mechanism for a ferromagnetic interaction in the rhombic (Rh) formof C60 (Rh-C60) is suggested on the basis of theoretical studies in relation to cage distortionof the C60 unit in the polymerized 2D-plane. Band structure calculations on Rh
Externí odkaz:
https://doaj.org/article/2e6444d9305b428e8ede5a99c4bf51ba