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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 19, issue 3
Ann. Geophys., 19, 351–358, 2001
https://doi.org/10.5194/angeo-19-351-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 19, 351–358, 2001
https://doi.org/10.5194/angeo-19-351-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Mar 2001

31 Mar 2001

An interpretation of ion composition diurnal variation deduced from EISCAT observations

A. V. Mikhailov1 and W. Kofman2 A. V. Mikhailov and W. Kofman
  • 1Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation 142090, Troitsk, Moscow Region, Russia
  • 2Laboratoire de Planétologie de Grenoble, Bâtiment D de Physique B. P. 53, 38041 Grenoble Cedex 9, France
  • Correspondence to: W. Kofman, (wlodek.kofman@planeto.obs.ujf-grenoble.fr)

Abstract. Physical interpretation is made of the O+/Ne diurnal variations in summer, revealed by Litvine et al. (1998) from the EISCAT observations. It is shown that the observed anti-correlation between the Z50 parameter, corresponding to the transition region between 50% of molecular and atomic ions, and the width Dz of the transition, defined as the altitude width between 10% and 90% of the O+/Ne ratio, can be reproduced in model calculations and the result of different recombination laws (quadratic in the lower and linear in the upper ionosphere) as well as diurnal variations in the photo-ionization rates.

Key words.Ionosphere (ion chemistry and composition; modeling and forecasting)

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