Influence of the ionosphere on radio astronomical signals according to GPS sounding and ionospheric modeling

Details Influence of the ionosphere on radio astronomical signals according to GPS sounding and ionospheric modeling Influence of the ionosphere on radio astronomical signals according to GPS sounding and ionospheric modeling

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.6936e..65a&link_type=abstract

Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Edited by Matvienko, Gennadii G.; Banak

Physics

Optics

1

Scientific paper

VHF signals are widely used for observations of the Sun and pulsars. Nowadays huge VHF radio astronomical arrays (LOFAR, 30-240 MHz; MIRA, 80-300 MHz) are being constructed to record pulsar radiation at maximum possible distance. Registration of VHF solar radio emission is very important along with other methods of monitoring of coronal mass ejections. At the interpretation of the data it is necessary to take into account possible distortions of these signals at the Earth ionosphere. We have developed a method and software for calculation of the ionosphere measure of rotation (RM), and the measure of dispersion (DM). We used the ionosphere model IRI-2001, magnetic field model IGRF-10 and values of ionosphere total electron content as deduced from GPS measurements. The obtained values of the ionosphere DM and RM were recalculated into characteristics of phase delay, Faraday amplitude modulation and polarization changes. In the paper we made calculations for different levels of geomagnetic activity and for different angular position of radio sources as well.

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