Numerical simulations on ionospheric control of polarization of low-latitude geomagnetic pulsations

Details Numerical simulations on ionospheric control of polarization of low-latitude geomagnetic pulsations Numerical simulations on ionospheric control of polarization of low-latitude geomagnetic pulsations

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11.1018i&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 11/12, p. 1018-1025

Physics

3

Geomagnetic Micropulsations, Ionospheric Conductivity, Magnetohydrodynamic Waves, Polarization Characteristics, Wave Propagation, Computerized Simulation, Hall Effect, Sunrise, Time Dependence

Scientific paper

By using a realistic east-west distribution of the height-integrated ionospheric Pedersen and Hall conductivities, numerical simulations on the ionospheric control of polarization of low-latitude Pc3-4-band geomagnetic pulsations have been made. It has been confirmed that the tilting of the major axis of the H-D plane polarization ellipse observed on the morning side is due to the ionospheric conductivity enhancement associated with sunrise. It has also been found that the magnetic field having a standing oscillation structure in the north-south direction and an amplitude peak in the neighborhood of the magnetic equator is valid as a source field of the low-latitude pulsations transmitted from the magnetosphere in the fast mode (or the poloidal mode). Further, it has been found that the sense of rotation of the magnetic perturbation vector in the H-D plane is controlled by the sense of east-west propagation. The sense of rotation is clockwise for eastward propagation and counterclockwise for westward propagation in the northern hemisphere, and vice versa in the southern hemisphere.

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