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| Titel |
Magnetic-inclination effects in the spectral resonance structure of the ionospheric Alfvén resonator |
| VerfasserIn |
T. Bösinger, E. N. Ermakova, C. Haldoupis, D. S. Kotik |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 3 ; Nr. 27, no. 3 (2009-03-13), S.1313-1320 |
| Datensatznummer |
250016457
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1313-2009.pdf |
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| Zusammenfassung |
| Based on recent developments in the formalism governing the spectral
resonance structures (SRS) of the Ionospheric Alfvén resonator (IAR) as
observed on the Earth's surface, a numerical code was developed to
investigate properties of SRS which can in particular be contributed to
magnetic inclination effects. Among the theoretical findings are: 1) SRS is
discernible in both orthogonal components, 2) the harmonic structure of SRS
is not anymore over frequency equidistantly distributed, 3) the frequency
scales of SRS differ in the two normal modes. The theoretically predicted
properties could be found in the observations of a low latitude and some of
them even in the data of a mid latitude station. The verification, however,
is not as straight forward because the predicted effects do not only depend
on magnetic inclination but also on the wave angle of the lightning induced
electromagnetic wave k-vector with the normal to the magnetic meridian
passing through the observation site. So far the formalism is simplified as
it deals with a single source situation alone whereas the actual observation
is a composite of excitations caused by an average of about 60 flashes of
lightning operating all the time, world-wide. |
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