Czechoslovak Journal of Physics

, Volume 48, Issue 1, pp 103–112 | Cite as

Evolution of the auroral oval during a weak substorm

  • J. Šafránková
  • Z. Němeček
  • O. Santolík


The present paper deals with a detailed study of the dynamics of the polar cap boundaries. The study involves the data from two satellites of the APEX project, and the data from three DMSP satellites. The APEX (Active Plasma Experiment) satellites moving along the polar orbit provide charged particle measurements in a small spatial scale (due to variable distance between both spacecrafts), up to 2 000 km. The large scale changes are studied by the comparison of the APEX and the DMSP (Defense Meteorological Satellite Program) data. Different regions are identified using the characteristics of the precipitating particles in the energy range 0.1–20 keV which have been registered onboard all satellites. This satellite configuration allows us to determine the evolution of the small structures as well as the motion of the whole precipitating region. The main attention is concentrated on the rising phase of the substorms when the width of the auroral oval decreases with the increasing geomagnetic activity and the velocity of the auroral oval motion can reach 0.2° per minute. The observed phenomena are compared with the changes of the interplanetary magnetic field and the solar wind parameters as provided by the IMP-8 spacecraft.


Solar Wind Interplanetary Magnetic Field Geomagnetic Activity Solar Wind Parameter Auroral Oval 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer 1998

Authors and Affiliations

  • J. Šafránková
    • 1
  • Z. Němeček
    • 1
  • O. Santolík
    • 1
  1. 1.Faculty of Mathematics and PhysicsCharles UniversityPraha 2Czech republic

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