Journal cover Journal topic
Advances in Radio Science An open-access journal of the U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V.
Journal topic

Journal metrics

Journal metrics

  • CiteScore value: 0.50 CiteScore
    0.50
  • SNIP value: 0.570 SNIP 0.570
  • IPP value: 0.25 IPP 0.25
  • SJR value: 0.172 SJR 0.172
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 19 Scimago H
    index 19
  • h5-index value: 7 h5-index 7
Volume 9
Adv. Radio Sci., 9, 343–348, 2011
https://doi.org/10.5194/ars-9-343-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Adv. Radio Sci., 9, 343–348, 2011
https://doi.org/10.5194/ars-9-343-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Aug 2011

01 Aug 2011

Some anomalies of mesosphere/lower thermosphere parameters during the recent solar minimum

Ch. Jacobi1, P. Hoffmann1, M. Placke2, and G. Stober2 Ch. Jacobi et al.
  • 1Institute for Meteorology, University of Leipzig, Stephanstr. 3, 04103 Leipzig, Germany
  • 2Leibniz Institute of Atmospheric Physics at the Rostock University, Schlossstraße 6, 18225 Kühlungsborn, Germany

Abstract. The recent solar minimum has been characterized by an anomalous strong decrease of thermospheric density since 2005. Here we analyze anomalies of mesosphere/lower thermosphere parameters possibly connected with this effect. In particular, nighttime mean LF reflection heights measured at Collm, Germany, show a very strong decrease after 2005, indicating a density decrease. This decrease is also visible in mean meteor heights measured with VHF meteor radar at Collm. This density decrease is accompanied by an increase of gravity wave (GW) amplitudes in the upper mesosphere and a decrease in the lower thermosphere. On the decadal scale, GWs are negatively correlated with the background zonal wind, but this correlation is modulated in the course of the solar cycle, indicating the combined effect of GW filtering and density decrease.

Publications Copernicus
Download
Citation