Zobrazeno 1 - 10
of 18
pro vyhledávání: '"G T, Marklund"'
Publikováno v:
Annales Geophysicae, Vol 28, Pp 439-448 (2010)
The first statistical results on the occurrence of abnormal subauroral ion drifts (ASAID) are presented based on electric and magnetic field measurements from the low-altitude Astrid-2 satellite. ASAID are narrow regions of rapid eastward ion drif
Externí odkaz:
https://doaj.org/article/a0543de923064da4b69a41deca6a4e0f
Autor:
G. T. Marklund
Publikováno v:
Nonlinear Processes in Geophysics, Vol 16, Iss 2, Pp 365-372 (2009)
The quasi-static coupling of high-altitude potential structures and electric fields to the ionosphere is discussed with particular focus on the downward field-aligned current (FAC) region. Results are presented from a preliminary analysis of a select
Externí odkaz:
https://doaj.org/article/2901da3a09d6472eabc8b38a7d76fb9b
Autor:
S. Liléo, G. T. Marklund, T. Karlsson, T. Johansson, P.-A. Lindqvist, A. Marchaudon, A. Fazakerley, C. Mouikis, L. M. Kistler
Publikováno v:
Annales Geophysicae, Vol 26, Pp 583-591 (2008)
Results are presented from a case study of a plasma boundary crossing by the Cluster spacecraft during an extended period of high auroral activity. The boundary between the magnetotail lobe region of the Southern Hemisphere and the plasma sheet bo
Externí odkaz:
https://doaj.org/article/3fbcae6372ab4e43afafcaf2214a2c0e
Autor:
S. Figueiredo, G. T. Marklund, T. Karlsson, T. Johansson, Y. Ebihara, M. Ejiri, N. Ivchenko, P.-A. Lindqvist, H. Nilsson, A. Fazakerley
Publikováno v:
Annales Geophysicae, Vol 23, Pp 2531-2557 (2005)
Two event studies are presented in this paper where intense convergent electric fields, with mapped intensities up to 1350 mV/m, are measured in the auroral upward current region by the Cluster spacecraft, at altitudes between 3 and 5 Earth radii
Externí odkaz:
https://doaj.org/article/1f4a4b04ea414d5ea046f7761035a15c
Publikováno v:
Annales Geophysicae, Vol 22, Pp 2463-2472 (2004)
Cluster multipoint measurements of the electric and magnetic fields from a crossing of auroral field lines at an altitude of 4RE are used to show that it is possible to resolve the ambiguity of temporal versus spatial variations in the fields. We
Externí odkaz:
https://doaj.org/article/6fbd27044cdb44a296494fadd94c758f
Publikováno v:
Annales Geophysicae, Vol 22, Pp 923-934 (2004)
Based on Astrid-2 satellite data, results are presented from a statistical study on subauroral ion drift (SAID) occurrence. SAID is a subauroral phenomenon characterized by a westward ionospheric ion drift with velocity greater than 1000m/s, or eq
Externí odkaz:
https://doaj.org/article/374a7cc27c0042ada579477254a1b777
Autor:
L. G. Blomberg, G. T. Marklund, P.-A. Lindqvist, F. Primdahl, P. Brauer, L. Bylander, J. A. Cumnock, S. Eriksson, N. Ivchenko, T. Karlsson, A. Kullen, J. M. G. Merayo, E. B. Pedersen, J. R. Petersen
Publikováno v:
Annales Geophysicae, Vol 22, Pp 115-123 (2004)
The Astrid-2 mission has dual primary objectives. First, it is an orbiting instrument platform for studying auroral electrodynamics. Second, it is a technology demonstration of the feasibility of using micro-satellites for innovative space plasma
Externí odkaz:
https://doaj.org/article/50150f78570a44d19fe3577753e0b307
Autor:
G. T. Marklund, T. Karlsson, S. Figueiredo, T. Johansson, P.-A. Lindqvist, M. André, S. Buchert, L. M. Kistler, A. Fazakerley
Publikováno v:
Nonlinear Processes in Geophysics, Vol 11, Iss 5/6, Pp 709-720 (2004)
Temporal and spatial characteristics of intense quasi-static electric fields and associated electric potential structures in the return current region are discussed using Cluster observations at geocentric distances of about 5 Earth radii. Results ar
Externí odkaz:
https://doaj.org/article/d668ddac7d87452b87dab2dfdb89d1f4
Publikováno v:
Annales Geophysicae, Vol 19, Pp 649-653 (2001)
The cross-polar potential drop Φpc and the low-latitude asymmetric geomagnetic disturbance field, as indicated by the mid-latitude ASY-H magnetic index, are used to study the average magnetospheric response to the solar wind forcing for sout
Externí odkaz:
https://doaj.org/article/d624415e6e294fce9a4c3f956b9dba78
Publikováno v:
Annales Geophysicae, Vol 19, Pp 633-641 (2001)
Results concerning the electrodynamics of the nightside auroral bulge are presented based on simultaneous satellite and ground-based observations. The satellite data include Astrid-2 measurements of electric fields, currents and particles from
Externí odkaz:
https://doaj.org/article/239086bed20b4be095f4b4a48311c2b7