Planetary electromagnetic waves in the ionospheric E-layer

Details Planetary electromagnetic waves in the ionospheric E-layer Planetary electromagnetic waves in the ionospheric E-layer

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..757k&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 6, p. 757-764.

Physics

11

Scientific paper

The linear theory for the large-scale (λ>103km) electromagnetic (EM) waves in the middle-latitude ionospheric E-layer is developed. The general dispersion relation for these waves is derived. It is shown that the latitudinal inhomogeneity of the geomagnetic field and the angular velocity of the Earth's rotation can lead to the appearance of wave modes in the form of slow and fast EM planetary waves. The slow mode is produced by the dynamo electric field and it represents a generalization of the ordinary Rossby type waves in a rotating atmosphere when the Hall effect in the E-layer is included. The fast mode is a new mode, which is associated with the oscillations of the ionospheric electrons frozen in the geomagnetic field. It represents the variation of the vortical electric field and it arises solely due to the latitudinal gradient of the external magnetic field. The basic characteristics of the wave modes, such as the wavelength, the frequency and the Rayleigh friction, are estimated. Other types of waves, termed slow magnetohydrodynamic (MHD) waves, which are insensitive to the spatial inhomogeneity of the Coriolis and Ampére forces are also reviewed. It is shown that they appear as an admixture of slow Alfvén (SA) and whistler type waves. Such waves can generate variations in the magnetic field from a few tenth to a few hundreds nT. It is stressed that the basic features of the considered waves agree with the general properties of the magnetic perturbations observed at the world network of magnetic and ionospheric stations.

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