Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Matti Ala-Lahti"'
Autor:
Lucile Turc, Hongyang Zhou, Vertti Tarvus, Matti Ala-Lahti, Markus Battarbee, Yann Pfau-Kempf, Andreas Johlander, Urs Ganse, Maxime Dubart, Harriet George, Maxime Grandin, Konstantinos Horaites, Fasil Tesema, Jonas Suni, Markku Alho, Konstantinos Papadakis, Minna Palmroth
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
Ultra-low frequency (ULF) waves in the Pc3 range, with periods between 10–45 s, are routinely observed in Earth’s dayside magnetosphere. They are thought to originate in the foreshock, which extends upstream of the quasi-parallel bow shock and is
Externí odkaz:
https://doaj.org/article/4415610f3b934334a522dd22587b72cf
Autor:
Matti Ala-Lahti, Tuija I. Pulkkinen, Julia Ruohotie, Mojtaba Akhavan-Tafti, Simon W. Good, Emilia K. J. Kilpua
Publikováno v:
The Astrophysical Journal, Vol 956, Iss 2, p 131 (2023)
The radial evolution of interplanetary coronal mass ejections (ICMEs) is dependent on their interaction with the ambient medium, which causes ICME erosion and affects their geoefficiency. Here, an ICME front boundary, which separates the confined eje
Externí odkaz:
https://doaj.org/article/eb897f894fc943d28815790a771102a1
Autor:
Emilia K. J. Kilpua, Simon W. Good, Erika Palmerio, Eleanna Asvestari, Erkka Lumme, Matti Ala-Lahti, Milla M. H. Kalliokoski, Diana E. Morosan, Jens Pomoell, Daniel J. Price, Jasmina Magdalenić, Stefaan Poedts, Yoshifumi Futaana
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 6 (2019)
We report a detailed analysis of interplanetary flux ropes observed at Venus and subsequently at Earth's Lagrange L1 point between June 15 and 17, 2012. The observation points were separated by about 0.28 AU in radial distance and 5° in heliographic
Externí odkaz:
https://doaj.org/article/0b46fd416f7a4410ad11820187bb5a2f
Magnetospheric sawtooth events (STE) are periodic oscillations in Earth’s magnetic field and energetic particle fluxes, typically occurring during geomagnetic storms. While previous studies have helped to provide information about the characteristi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0c12c539f63bb8d1dbdb816cf765a50
https://doi.org/10.5194/egusphere-egu23-9233
https://doi.org/10.5194/egusphere-egu23-9233
Autor:
Matti Ala-Lahti, Tuija Pulkkinen, Julia Ruohotie, Mojtaba Akhavan-Tafti, Simon Good, Emilia Kilpua
In the solar wind, a bifurcated current sheet is often observed in a reconnection outflow region as predicted by the original Petchek reconnection model, with the detailed exhaust structure becoming more complex when asymmetries between reconnecting
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ad2d7e48895b94111d2fa1e4c4f89b0
https://doi.org/10.5194/egusphere-egu23-17214
https://doi.org/10.5194/egusphere-egu23-17214
Solar wind-magnetosphere coupling drives magnetospheric dynamic phenomena by enabling energy exchange between magnetospheric and solar wind plasmas. In this study, we examine two-dimensional noon-midnight meridional plane simulation runs of the globa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::810ba465a32238ac0846568db511973e
http://hdl.handle.net/10138/351161
http://hdl.handle.net/10138/351161
Publikováno v:
Frontiers in Astronomy and Space Sciences. 9
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://explore.openaire.eu/search/publication?articleId=doi_dedup___::423fe4105ef775c86368858445bcae06
https://doi.org/10.3389/fspas.2022.943247
https://doi.org/10.3389/fspas.2022.943247
Like the solar wind in general, interplanetary coronal mass ejections (ICMEs) display magnetic field and velocity fluctuations across a wide range of scales. These fluctuations may be interpreted as Alfvénic wave packets propagating parallel or anti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f65a99c1a8512b9594b103d4e67fbdf7
https://doi.org/10.5194/egusphere-egu22-11274
https://doi.org/10.5194/egusphere-egu22-11274
Autor:
Emilia Kilpua, Simon Good, Matti Ala-Lahti, Adnane Osmane, Dominique Fontaine, Sanchita Pal, Juska Räsänen, Stuart Bale, Lingling Zhao, Lina Hadid, Miho Janvier, Emiliya Yordanova
The sheath regions driven by coronal mass ejections (CMEs) are large-scale heliospheric structures where magnetic field fluctuations are observed over various temporal scales. Their internal structure and nature of embedded fluctuations are currently
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38038da56e3f81dcec552576e65fde4e
https://doi.org/10.5194/egusphere-egu22-6199
https://doi.org/10.5194/egusphere-egu22-6199
Autor:
Clement Moissard, Adnane Osmane, Miho Janvier, Matti Ala-Lahti, D. Fontaine, Emiliya Yordanova, Emilia Kilpua, Lina Hadid, Simon Good, Erika Palmerio
Publikováno v:
Annales Geophysicae
Annales Geophysicae, European Geosciences Union, 2020, 38, pp.999-1017. ⟨10.5194/angeo-38-999-2020⟩
Annales Geophysicae, Vol 38, Pp 999-1017 (2020)
Annales Geophysicae, European Geosciences Union, 2020, 38, pp.999-1017. ⟨10.5194/angeo-38-999-2020⟩
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://explore.openaire.eu/search/publication?articleId=doi_dedup___::343dfa12cb8cb3bf811fab0b356c5f84
https://doi.org/10.5194/angeo-38-999-2020
https://doi.org/10.5194/angeo-38-999-2020