Relations of field line resonances and upstream waves and the winter attenuation of pulsations |
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| Authors: | J Ver\H{o} I Best M Vellante H Lühr M de Lauretis L Holló F Märcz J Str\ues\utik |
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| Institution: | (1) Geodetic and Geophysical Research Institute of the Hungarian Academy of Sciences, H-9401 Sopron, Pf. 5, Hungary;(2) GeoForschungsZentrum Potsdam, Adolf Schmidt Geomagnetisches Observatorium Niemegk, D-14823, Germany;(3) Institut für Geophysik und Meteorologie, Technische Universität Braunschweig, Mendelssohnstr. 3, D-38106 Braunschweig, Germany;(4) Dipartimento di Fisica, Universita dell’Aquila, Via Vetoio, I-67010 Copito L’Aquila, Italy;(5) Geofyzikalni Ústav AV C\uR, Praha 4, Spor\uilov, Boc\uni II 1401, CZ-14131, Czech Republic |
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| Abstract: | Using data on the occurrence frequency of geomagnetic pulsations of different periods from three observatories in Central Europe, conclusions are drawn about the occurrence of field line resonances and pulsations directly driven by upstream waves at L-values below 3. It was found that both types occur during the interval studied (first 6 months of the year 1991), but both the occurrence frequency of the two types and the characteristic period of the field line resonance change significantly as compared to other intervals. During Northern winter, pulsation activity is severely damped in solar maximum years, including the year 1991. The decrease in the activity of the pulsations is more significant at shorter periods. |
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