 |
| Titel |
On the new modes of planetary-scale electromagnetic waves in the ionosphere |
| VerfasserIn |
G. D. Aburjania, K. Z. Chargazia, G. V. Jandieri, A. G. Khantadze, O. A. Kharshiladze |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 22, no. 4 ; Nr. 22, no. 4 (2004-04-02), S.1203-1211 |
| Datensatznummer |
250014834
|
| Publikation (Nr.) |
 copernicus.org/angeo-22-1203-2004.pdf |
|
|
|
|
|
| Zusammenfassung |
Using an analogy method the frequencies of new modes of the electromagnetic
planetary-scale waves (with a wavelength of 103 km or more), having a weather forming
nature, are found at different ionospheric altitudes. This method gives the possibility
to determine spectra of ionospheric electromagnetic perturbations directly from the
dynamic equations without solving the general dispersion equation. It is shown that the
permanently acting factor-latitude variation of the geomagnetic field generates fast
and slow weakly damping planetary electromagnetic waves in both the E- and F-layers of
the ionosphere. The waves propagate eastward and westward along the parallels. The
fast waves have phase velocities (1–5)km s–1 and frequencies (10–1–10–4), and
the slow waves propagate with velocities of the local winds with frequencies
(10–4–10–6)s–1 and are generated in the E-region of the ionosphere. Fast waves having
phase velocities (10-1500)km s–1 and frequencies (1–10–3)s–1
are generated in the F-region of the ionosphere. The waves generate the geomagnetic pulsations of the order of
one hundred nanoTesla by magnitude. The properties and parameters of the theoretically
studied electromagnetic waves agree with those of large-scale ultra-low frequency
perturbations observed experimentally in the ionosphere.
Key words. Ionosphere (ionospheric disturbances; waves
propagation; ionosphere atmosphere interactions) |
| |
|
| Teil von |
|
|
|
|
|
|
|
|