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| Titel |
The effects of ionospheric 'phase mixing' on a distributed driven shear Alfvén ulf pulsation' |
| VerfasserIn |
I. Krauklis, D. Orr |
| 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 ; 12, no. 2/3 ; Nr. 12, no. 2/3, S.188-194 |
| Datensatznummer |
250010320
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| Publikation (Nr.) |
 copernicus.org/angeo-12-188-1994.pdf |
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| Zusammenfassung |
| A numerical simulation study of the ultra-low
frequency (ULF) H-component magnetic field at the Earth's surface arising from a
perturbation ionospheric Hall current has been developed. The Hall current
system is driven by field-aligned currents (FACs) associated with shear Alfvén
field line resonances (FLRs) driven by fast mode global cavity oscillations. The
ionospheric phase mixing of the Hall current manifests itself in a number of
ways in the ground field, these are: (i) Smoothing the spectral maxima of the
ground signal: (ii) Loss in clarity of the harmonic structure of the spectra:
(iii) A small increase in the damping rate of the ULF wave at the resonance
latitude and (iv) small localised minimum in the spectra at the resonance
latitude. |
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