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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 7
Ann. Geophys., 22, 2441–2450, 2004
https://doi.org/10.5194/angeo-22-2441-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Spatio-temporal analysis and multipoint measurements in space...

Ann. Geophys., 22, 2441–2450, 2004
https://doi.org/10.5194/angeo-22-2441-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Jul 2004

14 Jul 2004

Spatial and temporal variations of the high-altitude cusp precipitation

Z. Němeček, J. Šimůnek, J. Šafránková, and L. Přech Z. Němeček et al.
  • Charles University, Faculty of Mathematics and Physics, Prague, Czech Republic

Abstract. Structured dispersion patterns of the ion precipitation in low- and mid-altitude cusp regions have been reported by many authors. These patterns are interpreted either as temporal features in terms of the pulsed reconnection model or as spatial changes caused by a combination of the particle velocity with the convection of magnetic field lines. It is generally expected that the spatial dispersion is predominantly observed in lower altitudes where the spacecraft crosses a wide range of geomagnetic coordinates in a short time, whereas the high-altitude spacecraft observes temporal changes because it stays nearly on the same field line for a long time.

We have analyzed one pass of the INTERBALL-1/MAGION-4 satellite pair through the high-altitude cusp and found that both temporal and spatial dispersion effects are important even in the magnetopause vicinity. The analysis of the present event shows a spatial nature of the observed dispersion in the LLBL and in the plasma mantle. We have identified two sources of a mantle precipitation operating simultaneously. Our investigations suggest that besides already reported latitudinal dispersion, the longitudinal dispersion can be observed during intervals of sufficiently high east-west interplanetary magnetic field component.

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