pure and applied geophysics

, Volume 112, Issue 4, pp 635–645 | Cite as

A model of non-monotonically growingN(h) profiles of the lower ionosphere under non-flare conditions

  • E. M. Apostolov
Article

Summary

An idea is suggested to explain the existence of a local minimum in theN(h) profiles which is in the height range of 65–75 km under non-flare conditions. This minimum is due to the dominating ionizing influence of theLα radiation towards the influence of the X radiation at heights around 70 km. A model ofN(h) profiles is suggested approximated by three exponential and one parabolical functions on the basis of the models [21–24]. These profiles may be obtained by measuring the absorption from a minimum of two measuring frequencies by the A3 method, combined with the vertical sounding by the A1 method.

Keywords

Radiation Local Minimum Measuring Frequency Height Range Lower Ionosphere 

Résumé

L'on propose une idée de l'explication de l'existence du minimum local desN(h) profils qui existe dans la gamme d'altitude 65–75 km aux conditions non-éruptives. Ce minimum est due à dominante influence deLα rayonnement envers cette de rayons X à l'altitude vers 70 km. L'on propose un modèle deN(h) profils qui est approximatif par trois fonctions exponentielles et une fonction parabolic sur la base de modèles [21–24]. Ces profils on peut déterminer par la méthode A3 de mesure de l'absorption ionospheric du minimum deux frequences de mesure, coordonnées avec l'incidence vertical par la méthode A1.

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Copyright information

© Birkhäuser-Verlag 1974

Authors and Affiliations

  • E. M. Apostolov
    • 1
  1. 1.Geophysical Institute of the Bulgarian Academy of SciencesSofiaBulgaria

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