Computer Science – Sound
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40..965s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 7, July 1992, p. 965-971.
Computer Science
Sound
3
Amplitude Modulation, Doppler Effect, Extremely Low Radio Frequencies, Geomagnetic Pulsations, Ionospheric Propagation, Carrier Frequencies, Frequency Shift, Synchronous Satellites
Scientific paper
A complex ionospheric-phase refractive index is incorporated into a model relating ULF geomagnetic pulsations to ionospheric Doppler oscillations to study the modulation of radiowave absorption at the ULF pulsation frequency. The findings of Aslin et al. are summarized in which ionospheric focusing is the cause of amplitude modulations, and the model by Sutcliffe and Poole (1989) is extended by replacing the real-phase refractive index. The magnitudes of the rate of change of absorption associated with ULF pulsations are found to vary significantly according to radio sounding frequency, electron concentration profile, and pulsation scale length. The findings suggest that the modulation of radio-wave absorption can account for the large oscillations in echo amplitude. The model is shown to account for many of the observed characteristics of Pc1 geomagnetic pulsations.
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