Modeling the ionospheric parameters influence on the geomagnetic pulsation polarization: ULF magnetic field

Details Modeling the ionospheric parameters influence on the geomagnetic pulsation polarization: ULF magnetic field Modeling the ionospheric parameters influence on the geomagnetic pulsation polarization: ULF magnetic field

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63.1049a&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 10, p. 1049-1059.

Physics

1

Scientific paper

The influence of the ionospheric parameters on the polarization characteristics of magnetosonic or ULF compressional wave disturbances is modeled. The parameters that have a significant impact on the polarization signature of the ULF compressional disturbances are the maximum height (hmE) and maximum concentration (NmE) of the E-region. The polarization rotation angle lies in the interval 0-/90° for every critical frequency f0E (in MHz), but its magnitude is controlled by the maximum height hmE. For low maximum heights (hm~100km) and higher critical frequencies (f0E) determined by the maximum concentration NmE(f0E>2), the rotation angle is nearly /90°. For high maximum heights (hmE~130km) and a lower critical frequency (f0E<2), the rotation angle reduces to zero. The second effect, the ellipticity of the ULF wave disturbance, also varies in a wide interval, from a linear (the ellipticity effect is zero) to circular (the ellipticity is 1), depending on the E-region's maximum height (hmE). It is shown that the ellipticity effect has a maximum value for only a certain combination of f0E and hmE. The F-region ionization does not contribute essentially to the ionospheric effects on the ULF disturbance penetrations.

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