First evidence of anisotropy of GPS phase slips caused by the mid-latitude field-aligned ionospheric irregularities

Details First evidence of anisotropy of GPS phase slips caused by the mid-latitude field-aligned ionospheric irregularities First evidence of anisotropy of GPS phase slips caused by the mid-latitude field-aligned ionospheric irregularities

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011adspr..47.1674a&link_type=abstract

Advances in Space Research, Volume 47, Issue 10, p. 1674-1680.

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The mid-latitude field-aligned irregularity (FAI) along the magnetic field line is a common phenomenon in the ionosphere. However, few data reveal the field-aligned ionospheric irregularities. They are insufficient to identify FAIs effects so far, particularly effect on global positioning system (GPS) signals. In this paper, the mid-latitude FAIs by line-of-sight angular scanning relative to the local magnetic field vector are investigated using the denser GPS network observations in Japan. It has been the first found that total GPS L2 phase slips over Japan, during the recovery phase of the 12 Feb 2000 geomagnetic storm were caused by GPS signal scattering on FAIs both for the lines-of-sight aligned to the magnetic field line (the field of aligned scattering, FALS) and across the magnetic field line (the field of across scattering, FACS). The FALS results are also in a good agreement with the data of the magnetic field orientation control of GPS occultation observations of equatorial scintillation during thorough low earth orbit (LEO) satellites measurements, e.g. Challenging Minisatellite Payload (CHAMP) and Satellite de Aplicaciones Cientificas-C (SAC-C). The role of large-angle scattering almost along the normal to the magnetic field line in GPS scintillation is determined by attenuation of the irregularity anisotropy factor as compared with the other factors.

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