Ionospheric Solar Flare Effects Monitored by the Ground-based GPS Receivers ­V Theory and Observation

Details Ionospheric Solar Flare Effects Monitored by the Ground-based GPS Receivers ­V Theory and Observation Ionospheric Solar Flare Effects Monitored by the Ground-based GPS Receivers ­V Theory and Observation

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa22a..05l&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA22A-05

Physics

2479 Solar Radiation And Cosmic Ray Effects, 2435 Ionospheric Disturbances

Scientific paper

A theoretical model for monitoring ionospheric solar flare effects by using ground-based receivers of the global positioning system (GPS) has been developed and reviewed in this paper. The physical representations and meanings of two GPS quantities, variations in the total electron content (TEC) and their time rate of changes (rTEC), are examined and discussed. The theoretical and mathematical derivations show that the rTEC practically represent the frequency deviation of the GPS signals. Meanwhile, worldwide ground based GPS receivers are used to derive the TEC and associated rTEC to monitor the ionospheric solar flare effect on 14 July (Bastille Day) 2000. It is found that ionospheric solar flare effects can be observed from pre-dawn to post-dusk regions, and the most pronounced signatures appear in the midday area. The agreement between theoretical predications and observations demonstrates that the GPS TEC is suitable to monitor the overall variations of flare X-ray radiations while the rTEC is capable to detect sudden changes in flare X-ray radiations.

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