Zobrazeno 1 - 10
of 201
pro vyhledávání: '"G. Marklund"'
Autor:
T. Karlsson, F. Plaschke, H. Hietala, M. Archer, X. Blanco-Cano, P. Kajdič, P.-A. Lindqvist, G. Marklund, D. J. Gershman
Publikováno v:
Annales Geophysicae, Vol 36, Pp 655-677 (2018)
We use Magnetosphere Multiscale (MMS) mission data to investigate a small number of magnetosheath jets, which are localized and transient increases in dynamic pressure, typically due to a combined increase in plasma velocity and density. For two a
Externí odkaz:
https://doaj.org/article/81f59ee936004d34ac4f5b105feac6e5
Autor:
H. Dahlgren, B. Gustavsson, B. S. Lanchester, N. Ivchenko, U. Brändström, D. K. Whiter, T. Sergienko, I. Sandahl, G. Marklund
Publikováno v:
Annales Geophysicae, Vol 29, Pp 1699-1712 (2011)
Two discrete auroral arc filaments, with widths of less than 1 km, have been analysed using multi-station, multi-monochromatic optical observations from small and medium field-of-view imagers and the EISCAT radar. The energy and flux of the precip
Externí odkaz:
https://doaj.org/article/c9eb7aa4b2d0428e99dba1152d8be748
Publikováno v:
Annales Geophysicae, Vol 26, Pp 1905-1917 (2008)
Simultaneous observations were made of dynamic aurora during substorm activity on 26 January 2006 with three high spatial and temporal resolution instruments: the ASK (Auroral Structure and Kinetics) instrument, SIF (Spectrographic Imaging Facilit
Externí odkaz:
https://doaj.org/article/0b9ffe15a50d4344894bedb67ed33a99
Publikováno v:
Annales Geophysicae, Vol 26, Pp 1041-1048 (2008)
The ASK instrument (Auroral Structure and Kinetics) is a narrow field auroral imager, providing simultaneous images of aurora in three different spectral bands at multiple frames per second resolution. The three emission species studied are O2+ (
Externí odkaz:
https://doaj.org/article/dca4a8954ba54b438c019e56ebb5854a
Publikováno v:
Annales Geophysicae, Vol 25, Pp 2413-2425 (2007)
The scale sizes of intense (>0.15 V/m, mapped to the ionosphere), high-altitude (4–7 RE geocentric distance) auroral electric fields (measured by the Cluster EFW instrument) have been determined in a statistical study. Monopolar and bipolar ele
Externí odkaz:
https://doaj.org/article/c31399a9b6074a66973d394bee6e99bd
Autor:
T. Johansson, G. Marklund, T. Karlsson, S. Liléo, P.-A. Lindqvist, A. Marchaudon, H. Nilsson, A. Fazakerley
Publikováno v:
Annales Geophysicae, Vol 24, Pp 1713-1723 (2006)
The profile of intense high-altitude electric fields on auroral field lines has been studied using Cluster data. A total of 41 events with mapped electric field magnitudes in the range between 0.5–1 V/m were examined, 27 of which were co-located
Externí odkaz:
https://doaj.org/article/8f399b7545d04de291fb8977a2b38d11
Autor:
A. T. Aikio, K. Mursula, S. Buchert, F. Forme, O. Amm, G. Marklund, M. Dunlop, D. Fontaine, A. Vaivads, A. Fazakerley
Publikováno v:
Annales Geophysicae, Vol 22, Pp 4089-4101 (2004)
The four Cluster s/c passed over Northern Scandinavia on 6 February 2001 from south-east to north-west at a radial distance of about 4.4 RE in the post-midnight sector. When mapped along geomagnetic field lines, the separation of the spacecraft in
Externí odkaz:
https://doaj.org/article/d5546676f1eb40eca4e980a321f1b8c7
Autor:
T. Johansson, S. Figueiredo, T. Karlsson, G. Marklund, A. Fazakerley, S. Buchert, P.-A. Lindqvist, H. Nilsson
Publikováno v:
Annales Geophysicae, Vol 22, Pp 2485-2495 (2004)
Cluster electric field, magnetic field, and energetic electron data are analyzed for two events of intense auroral electric field variations, both encountered in the Plasma Sheet Boundary Layer (PSBL), in the evening local time sector, and at app
Externí odkaz:
https://doaj.org/article/6b70e408872b4b34b09e762c7884f1fb
Autor:
G. Gustafsson, M. André, T. Carozzi, A. I. Eriksson, C.-G. Fälthammar, R. Grard, G. Holmgren, J. A. Holtet, N. Ivchenko, T. Karlsson, Y. Khotyaintsev, S. Klimov, H. Laakso, P.-A. Lindqvist, B. Lybekk, G. Marklund, F. Mozer, K. Mursula, A. Pedersen, B. Popielawska, S. Savin, K. Stasiewicz, P. Tanskanen, A. Vaivads, J.-E. Wahlund
Publikováno v:
Annales Geophysicae, Vol 19, Pp 1219-1240 (2001)
Highlights are presented from studies of the electric field data from various regions along the Cluster orbit. They all point towards a very high coherence for phenomena recorded on four spacecraft that are separated by a few hundred kilometers
Externí odkaz:
https://doaj.org/article/1fdada10f6a448f3bb6b2cc7f30e1cb5
Autor:
N. Ivchenko, G. Marklund
Publikováno v:
Annales Geophysicae, Vol 19, Pp 643-648 (2001)
We present a statistical study of low frequency fluctuations of electric and magnetic fields, commonly interpreted as Alfvénic activity. The data base consists of six months of electric and magnetic field measurements by the Astrid-2 microsate
Externí odkaz:
https://doaj.org/article/b13fbff7900341b78ac2e9f8d59d3430