Results 51 to 60 of about 22,029 (223)

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, S. E. Milan, M. Lester, T. K. Yeoman   +3 more
doaj   +1 more source

Effects of electrojet turbulence on a magnetosphere-ionosphere simulation of a geomagnetic storm [PDF]

, 2017
Ionospheric conductance plays an important role in regulating the response of the magnetosphere‐ionosphere system to solar wind driving. Typically, models of magnetosphere‐ionosphere coupling include changes to ionospheric conductance driven by extreme ...
Dimant, Y., Liu, J., Lyon, J.G., Merkin, V., Oppenheim, M., Sitnov, M.I., Stephens, G.K., Toffoletto, F., Wang, W., Wiltberger, M., Zhang, B.   +10 more
core   +1 more source

GPS ionospheric imaging of the north polar ionosphere on 30 October 2003

Advances in Space Research, 2005
Abstract Maps of electron content retrieved from a 3-dimensional assimilation process of GPS TEC measurements are applied to observe the north polar ionosphere in the evening of 30 October 2003. Their reliability for large-scale imaging is discussed in comparison with GPS data coverage and radar observations.
Stolle, C., Schlüter, S., Heise, S., Jacobi, C., Jakowski, N., Friedel, S., Kürschner, D., Lühr, H.   +7 more
openaire   +4 more sources

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  

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, A. M. Smith, A. M. Smith, S. E. Pryse, L. Kersley   +4 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, M. Lester, S. W. H. Cowley, K. Oksavik, M. Brittnacher, R. A. Greenwald, G. Sofko, J.-P. Villain   +7 more
doaj   +1 more source

Observations of three-dimensional ionospheric plasma properties in a space hurricane

Frontiers in Astronomy and Space Sciences
The space hurricane is a newly discovered large-scale three-dimensional magnetic vortex structure that spans the polar ionosphere and magnetosphere.
Sheng Lu, Zan-Yang Xing, Qing-He Zhang, Qing-He Zhang, Yongliang Zhang, Kjellmar Oksavik, Kjellmar Oksavik, L. R. Lyons, Michael Lockwood, Yu-Zhang Ma, Xiang-Yu Wang, N. Balan, Hui-Gen Yang, Hui-Gen Yang, Yong Wang, Zhong-Xin Deng, Tong Xu, Shu-Ji Sun   +17 more
doaj   +1 more source

Positive storm effects in the dayside polar ionospheric F-region observed by EISCAT and ESR during the magnetic storm of 15 May 1997 [PDF]

Annales Geophysicae, 2002
EISCAT/ESR radar data and in situ FAST and POLAR satellite observations are coordinately analyzed to investigate positive ionospheric storm effects in the dayside upper F-region in both the polar cap and the auroral oval during the magnetic storm ...
S. Y. Ma, S. Y. Ma, H. T. Cai, H. X. Liu, K. Schlegel, G. Lu   +5 more
doaj   +1 more source

Response of convection electric fields in the magnetosphere to IMF orientation change [PDF]

, 2009
[1] The transient response of convection electric fields in the inner magnetosphere to southward turning of the interplanetary magnetic field (IMF) is investigated using in‐situ electric field observations by the CRRES and Akebono spacecraft.
Brautigam, D., Kikuchi, T., Matsuoka, A., Nagatsuma, T., Nishimura, Y., Ono, T., Shinbori, A., Wygant, J.   +7 more
core   +1 more source

Suprathermal electrons in the polar ionosphere [PDF]

Journal of Geophysical Research, 1969
Suprathermal electrons energy distributions as function of magnetic latitude in polar ionosphere obtained by Explorer 31 satellite ...
openaire   +1 more source