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Volume 61 Supplement 5

Special Issue: Flare-Substorm/Space Weather Topics

Proxy for the ionospheric peak plasma density reduced by the solar zenith angle

Abstract

The F2 layer peak plasma density NmF2 is reduced by the factor constructed from the relative changes in the Sun’s zenith angle ξ for a particular local time and the local noon value χ0. Proposed transformation yields a proxy for the peak plasma density which coincides with the source observation at noon but apart from the latter is gradually reduced towards the night. Hourly observations at 8 ground based ionosondes for the solar maximum (2000) and minimum (2006) are analyzed for inter-stations and inter-seasonal correlation of the peak plasma density and the proxy values. The proxy values show improved correlation between the data at different locations and improved inter-seasonal correlations for a particular location due to greater homogeneity of results throughout the year contributing to improved evaluation of the ionospheric weather indices.

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Correspondence to T. L. Gulyaeva.

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Gulyaeva, T.L. Proxy for the ionospheric peak plasma density reduced by the solar zenith angle. Earth Planet Sp 61, 629–631 (2009). https://doi.org/10.1186/BF03352938

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  • DOI: https://doi.org/10.1186/BF03352938

Key words

  • Ionosphere
  • plasma density
  • solar zenith angle