On the new modes of planetary-scale electromagnetic waves in the ionosphere

作者: G. D. Aburjania , K. Z. Chargazia , G. V. Jandieri , A. G. Khantadze , O. A. Kharshiladze

DOI: 10.5194/ANGEO-22-1203-2004

关键词: GeophysicsWave propagationPhase velocityWavelengthDispersion relationEarth's magnetic fieldPhase (waves)IonospherePhysicsElectromagnetic radiation

摘要: Abstract. Using an analogy method the frequencies of new modes electromagnetic planetary-scale waves (with a wavelength 103 km or more), having weather forming nature, are found at different ionospheric altitudes. This gives possibility to determine spectra perturbations directly from dynamic equations without solving general dispersion equation. It is shown that permanently acting factor-latitude variation geomagnetic field generates fast and slow weakly damping planetary in both E- F-layers ionosphere. The propagate eastward westward along parallels. have phase velocities (1–5)km s–1 (10–1–10–4), with local winds (10–4–10–6)s–1 generated E-region Fast (10-1500)km (1–10–3)s–1 F-region generate pulsations order one hundred nanoTesla by magnitude. properties parameters theoretically studied agree those large-scale ultra-low frequency observed experimentally Key words. Ionosphere (ionospheric disturbances; propagation; ionosphere atmosphere interactions)

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