Zobrazeno 1 - 10
of 38
pro vyhledávání: '"E K J Kilpua"'
Publikováno v:
Annales Geophysicae, Vol 42, Pp 163-177 (2024)
In this work, we perform a statistical study of magnetic field fluctuations in the solar wind at 1 au using permutation entropy and complexity analysis and the investigation of the temporal variations of the Hurst exponents. Slow and fast wind, magne
Externí odkaz:
https://doaj.org/article/4a2dd2893caf47b4ad4ab16ebbd9a950
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 3 (2024)
This paper offers a fresh perspective on solar chromosphere heating and plasma outflows, focusing on the contribution of waves generated by solar granulation. Utilizing a 2.5D numerical experiment for the partially ionized lower solar atmosphere, we
Externí odkaz:
https://doaj.org/article/8f04ef49af874141a6c04d848ceccf20
Publikováno v:
The Astrophysical Journal Letters, Vol 956, Iss 1, p L30 (2023)
Interplanetary coronal mass ejections (ICMEs) have low proton beta across a broad range of heliocentric distances and a magnetic flux rope structure at large scales, making them a unique environment for studying solar wind fluctuations. Power spectra
Externí odkaz:
https://doaj.org/article/e6b9f6ac310e4bc984b9753fb1b1754b
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
The magnetic twist is one of the key defining parameters of solar flux ropes (FRs). The routine computation of the winding of magnetic field lines, referred to as the twist, has the potential to lead to significant advancement in the field of solar p
Externí odkaz:
https://doaj.org/article/298f6e5e75e3475ab104f6fa6452f7ed
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
Sheath regions of interplanetary coronal mass ejections (ICMEs) are formed when the upstream solar wind is deflected and compressed due to the propagation and expansion of the ICME. Small-scale flux ropes found in the solar wind can thus be swept int
Externí odkaz:
https://doaj.org/article/1a656ff6b165488598917518c4e8c76e
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
Autor:
E. K. J. Kilpua, D. Fontaine, S. W. Good, M. Ala-Lahti, A. Osmane, E. Palmerio, E. Yordanova, C. Moissard, L. Z. Hadid, M. Janvier
Publikováno v:
Annales Geophysicae, Vol 38, Pp 999-1017 (2020)
In this work, we investigate magnetic field fluctuations in three coronal mass ejection (CME)-driven sheath regions at 1 AU, with their speeds ranging from slow to fast. The data set we use consists primarily of high-resolution (0.092 s) magnetic
Externí odkaz:
https://doaj.org/article/d924c28382cf47a0819eb633cedea544
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. K. J. Kilpua, S. W. Good, M. Ala-Lahti, A. Osmane, D. Fontaine, L. Hadid, M. Janvier, E. Yordanova
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 7 (2021)
We report a statistical analysis of magnetic field fluctuations in 79 coronal mass ejection- (CME-) driven sheath regions that were observed in the near-Earth solar wind. Wind high-resolution magnetic field data were used to investigate 2 h regions a
Externí odkaz:
https://doaj.org/article/56c9549cac3c43159904a6a9e0c7425f
Autor:
L. Turc, O. W. Roberts, D. Verscharen, A. P. Dimmock, P. Kajdič, M. Palmroth, Y. Pfau-Kempf, A. Johlander, M. Dubart, E. K. J. Kilpua, J. Soucek, K. Takahashi, N. Takahashi, M. Battarbee, U. Ganse
Publikováno v:
Nature Physics. 19:78-86
The Earth’s magnetosphere and its bow shock, which is formed by the interaction of the supersonic solar wind with the terrestrial magnetic field, constitute a rich natural laboratory enabling in situ investigations of universal plasma processes. Un
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39b65b4855639a4d432105c8e3f6ed0c
https://doi.org/10.1038/s41567-022-01837-z
https://doi.org/10.1038/s41567-022-01837-z