Ion and neutral temperature distributions in the E-region observed by the EISCAT Tromsø and Svalbard radars [PDF]
Annales Geophysicae, 2002 Simultaneous Common Program Two experiments by the EISCAT UHF radar at Tromsø and the EISCAT Svalbard radar at Longyearbyen from 00:00 to 15:00 UT on 22 September 1998 and 9 March 1999 have been utilized to investigate distributions of the ion and
S. Maeda +5 more
doaj +1 more source
HF propagation modelling within the polar ionosphere [PDF]
12th IET International Conference on Ionospheric Radio Systems and Techniques (IRST 2012), 2012 This paper illustrates the importance of understanding and taking into account the presence of various structural features in the polar ionosphere (in particular, patches and arcs of enhanced electron density) when planning and operating HF radio links.
Warrington, E. Michael +3 more
openaire +2 more sources
Evidence for solar-production as a source of polar-cap plasma [PDF]
Annales Geophysicae, 2004 The focus of the study is a region of enhanced ionospheric densities observed by the EISCAT Svalbard radar in the polar F-region near local magnetic noon under conditions of IMF Bz<0.
S. E. Pryse +6 more
doaj +1 more source
A simple axisymmetric model of magnetosphere‐ionosphere coupling currents in Jupiter's polar ionosphere [PDF]
Journal of Geophysical Research: Space Physics, 2005 We propose a simple illustrative axisymmetric model of the plasma flow and currents in Jupiter's polar ionosphere which are due both to internal magnetospheric plasma processes and the solar wind interaction. The plasma flow in the model is specified using a combination of observations, previous modeling, and theory, and the ionospheric and field ...
Cowley, S. W. H. +8 more
openaire +3 more sources
Polar cap arcs from the magnetosphere to the ionosphere: kinetic modelling and observations by Cluster and TIMED [PDF]
Annales Geophysicae, 2012 On 1 April 2004 the GUVI imager onboard the TIMED spacecraft spots an isolated and elongated polar cap arc. About 20 min later, the Cluster satellites detect an isolated upflowing ion beam above the polar cap.
R. Maggiolo +7 more
doaj +1 more source
Variations in the polar cap area during two substorm cycles [PDF]
Annales Geophysicae, 2003 This study employs observations from several sources to determine the location of the polar cap boundary, or open/closed field line boundary, at all local times, allowing the amount of open flux in the magnetosphere to be quantified.
S. E. Milan +7 more
doaj +1 more source
Plasma channels in the Venus upper ionosphere [PDF]
Geofísica Internacional, 2001 The structure of the Venus nightside ionosphere is modeled in terms of a flow configuration derived from the position of the intermediate transition along the flanks of the ionosheath downstream from the magnetic polar regions.
H. Pérez de Tejada
doaj
HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring [PDF]
Annales Geophysicae, 2002 Three intervals of polar patch formation, as observed by the CUTLASS Finland HF coherent radar, are presented. Simultaneous observations from a vertical ionosonde located at Longyearbyen on Svalbard, situated in the dayside convection throat region,
S. E. Milan +3 more
doaj +1 more source
Space weather challenges of the polar cap ionosphere
Journal of Space Weather and Space Climate, 2013 This paper presents research on polar cap ionosphere space weather phenomena conducted during the European Cooperation in Science and Technology (COST) action ES0803 from 2008 to 2012.
Spogli Luca +5 more
doaj +1 more source
Polar patches observed by ESR and their possible origin in the cusp region [PDF]
Annales Geophysicae, 2000 Observations by the EISCAT Svalbard radar in summer have revealed electron density enhancements in the magnetic noon sector under conditions of IMF Bz southward.
A. M. Smith +4 more
doaj +1 more source