Changes in the reflectivity of the midlatitude ionosphere with respect to the ULF (Pc1) signal |
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Authors: | Karel Prikner Vladimír Vagner Reviewer M Hvoždara |
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Institution: | (1) Geophysical Institute, Czechosl. Acad. Sci., Prague;(2) FTO Metalimex, Prague |
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Abstract: | Summary The method of numerical modelling of ionospheric filtration of the Fourier components of a signal from the frequency range of Pc1 micropulsations is employed in the spectral analysis (frequency f, angle of incidence ) of the relative characteristic of the amplitude and energy reflectivity of the ionospheric layer with respect to ordinary Alfvén modes incident in the meridional plane. The results are presented for four different models characterizing the midlatitude day- and night-time ionosphere under low and high solar activity. The results indicate the specificity of filtration of ordinary Alfvén waves. It is proved that the lower region of the modelled ionosphere, as part of the midlatitude ionospheric wave guide (in particular the F2 layer), behaves like an Alfvén resonator in the given spectral range.
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![vcy](/content/v3h8763w0lq7m2l1/xxlarge1074.gif) a a m F2-u![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) ![ncy](/content/v3h8763w0lq7m2l1/xxlarge1085.gif) ![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) ![scy](/content/v3h8763w0lq7m2l1/xxlarge1089.gif) ![fcy](/content/v3h8763w0lq7m2l1/xxlarge1092.gif) ![iecy](/content/v3h8763w0lq7m2l1/xxlarge1077.gif) ![rcy](/content/v3h8763w0lq7m2l1/xxlarge1088.gif) ![ncy](/content/v3h8763w0lq7m2l1/xxlarge1085.gif) ![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) ![gcy](/content/v3h8763w0lq7m2l1/xxlarge1075.gif) ![scy](/content/v3h8763w0lq7m2l1/xxlarge1089.gif) ![rcy](/content/v3h8763w0lq7m2l1/xxlarge1088.gif) ¶rt;![ncy](/content/v3h8763w0lq7m2l1/xxlarge1085.gif) ![iecy](/content/v3h8763w0lq7m2l1/xxlarge1077.gif) u![rcy](/content/v3h8763w0lq7m2l1/xxlarge1088.gif) m![ncy](/content/v3h8763w0lq7m2l1/xxlarge1085.gif) ![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) ![gcy](/content/v3h8763w0lq7m2l1/xxlarge1075.gif) ![vcy](/content/v3h8763w0lq7m2l1/xxlarge1074.gif) ![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) ![lcy](/content/v3h8763w0lq7m2l1/xxlarge1083.gif) ![ncy](/content/v3h8763w0lq7m2l1/xxlarge1085.gif) ![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) ![vcy](/content/v3h8763w0lq7m2l1/xxlarge1074.gif) ¶rt;a) ![vcy](/content/v3h8763w0lq7m2l1/xxlarge1074.gif) ¶rt; m ![scy](/content/v3h8763w0lq7m2l1/xxlarge1089.gif) ![iecy](/content/v3h8763w0lq7m2l1/xxlarge1077.gif) ![bcy](/content/v3h8763w0lq7m2l1/xxlarge1073.gif) n![iecy](/content/v3h8763w0lq7m2l1/xxlarge1077.gif) m a![lcy](/content/v3h8763w0lq7m2l1/xxlarge1083.gif) ![softcy](/content/v3h8763w0lq7m2l1/xxlarge1100.gif) ![ncy](/content/v3h8763w0lq7m2l1/xxlarge1085.gif) ![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) ¶rt;uana![zcy](/content/v3h8763w0lq7m2l1/xxlarge1079.gif) ![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) ![ncy](/content/v3h8763w0lq7m2l1/xxlarge1085.gif) a ![rcy](/content/v3h8763w0lq7m2l1/xxlarge1088.gif) ![iecy](/content/v3h8763w0lq7m2l1/xxlarge1077.gif) ![zcy](/content/v3h8763w0lq7m2l1/xxlarge1079.gif) ![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) am![ocy](/content/v3h8763w0lq7m2l1/xxlarge1086.gif) ![Acy](/content/v3h8763w0lq7m2l1/xxlarge1040.gif) ![lcy](/content/v3h8763w0lq7m2l1/xxlarge1083.gif) ![softcy](/content/v3h8763w0lq7m2l1/xxlarge1100.gif) ![vcy](/content/v3h8763w0lq7m2l1/xxlarge1074.gif) ![iecy](/content/v3h8763w0lq7m2l1/xxlarge1077.gif) a.
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