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1Occurrence frequencies of polar mesosphere summer echoes observed at 69° N during a full solar cycle“... of the solar and geomagnetic control of the PMSE as well as of possible long-term changes. The PMSE...”
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2Multi beam observations of cosmic radio noise using a VHF radar with beam forming by a Butler matrix“... of enhanced solar and geomagnetic activity as indicators for enhanced ionization at altitudes below 90 km...”
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Article in Journal/Newspaper