Journal cover Journal topic
Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 27, 831-837, 2009
https://doi.org/10.5194/angeo-27-831-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
19 Feb 2009
The influence of geomagnetic activity on mesospheric summer echoes in middle and polar latitudes
O. Zeller1,2 and J. Bremer1 1Leibniz-Institute of Atmospheric Physics, 18225 Kühlungsborn, Schloss-Str. 6, Germany
2Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
Abstract. The dependence of mesospheric VHF radar echoes during summer months on geomagnetic activity has been investigated with observation data of the OSWIN radar in Kühlungsborn (54° N) and of the ALWIN radar in Andenes (69° N). Using daily mean values of VHF radar echoes and of geomagnetic activity indices in superimposed epoch analyses, the comparison of both data sets shows in general stronger radar echoes on the day of the maximum geomagnetic activity, the maximum value one day after the geomagnetic disturbance, and enhanced radar echoes also on the following 2–3 days. This phenomenon is observed at middle and polar latitudes and can be explained by precipitating particle fluxes during the ionospheric post storm effect. At polar latitudes, the radar echoes decrease however during and one day after very strong geomagnetic disturbances. The possible reason of this surprising effect is discussed.

Citation: Zeller, O. and Bremer, J.: The influence of geomagnetic activity on mesospheric summer echoes in middle and polar latitudes, Ann. Geophys., 27, 831-837, https://doi.org/10.5194/angeo-27-831-2009, 2009.
Publications Copernicus
Download
Share