Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.490 IF 1.490
  • IF 5-year value: 1.445 IF 5-year
    1.445
  • CiteScore value: 2.9 CiteScore
    2.9
  • SNIP value: 0.789 SNIP 0.789
  • IPP value: 1.48 IPP 1.48
  • SJR value: 0.74 SJR 0.74
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 88 Scimago H
    index 88
  • h5-index value: 21 h5-index 21
Volume 16, issue 4
Ann. Geophys., 16, 460–469, 1998
https://doi.org/10.1007/s00585-998-0460-8
© European Geosciences Union 1998
Ann. Geophys., 16, 460–469, 1998
https://doi.org/10.1007/s00585-998-0460-8
© European Geosciences Union 1998

  30 Apr 1998

30 Apr 1998

Anomalous electron density events in the quiet summer ionosphere at solar minimum over Millstone Hill

A. V. Pavlo1 and M. J. Buonsanto2 A. V. Pavlo and M. J. Buonsanto
  • 1Institute of Terrestrial Magnetism, Ionosphere and Radio-Wave Propagation, Russia
  • Academy of Science (IZMIRAN), Troitsk, Moscow Region, 142092, Russia
  • 2Massachusetts Institute of Technology, Haystack Observatory, Westford, MA 01886, USA

Abstract. This study compares the observed behavior of the F region ionosphere over Millstone Hill with calculations from the IZMIRAN model for solar minimum for the geomagnetically quiet period 23-25 June 1986, when anomalously low values of hmF2(<200 km) were observed. We found that these low values of hmF2 (seen as a G condition on ionograms) exist in the ionosphere due to a decrease of production rates of oxygen ions resulting from low values of atomic oxygen density. Results show that determination of a G condition using incoherent scatter radar data is sensitive both to the true concentration of O+ relative to the molecular ions, and to the ion composition model assumed in the data reduction process. The increase in the O++ N 2 loss rate due to vibrationally excited N2 produces a reduction in NmF2 of typically 5-10% , but as large as 15% , bringing the model and data into better agreement. The effect of vibrationally excited NO+ ions on electron densities is negligible.

Key words. Ionosphere (Ion chemistry and composition; Ionosphere-atmosphere interactions; Mid-latitude ionosphere).

Publications Copernicus
Download
Citation