The influence of geomagnetic activity on mesospheric summer echoes in middle and polar latitudes

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 indice...

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Bibliographic Details
Main Authors: Zeller, O., Bremer, J.
Format: Article in Journal/Newspaper
Language:English
Published: München : European Geopyhsical Union 2009
Subjects:
Ionosphere (Mid-latitude ionosphere
Polar ionosphere) Radio science (Remote sensing)
comparative study
flux measurement
geomagnetic field
geomagnetism
mesosphere
polar meteorology
radar
530
Andenes
Online Access:https://doi.org/10.34657/1678
https://oa.tib.eu/renate/handle/123456789/4043
Description
Summary: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. publishedVersion

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