The response of ionospheric TEC to small and faint solar flares

Details The response of ionospheric TEC to small and faint solar flares The response of ionospheric TEC to small and faint solar flares

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006acasn..47..212h&link_type=abstract

Acta Astronomica Sinica, vol. 47, no. 2, p. 212-217

Astronomy and Astrophysics

Astronomy

Astrometry: Gps, Total Electron Content (Tec)

Scientific paper

Using GPS observational data of multi-sites provided by International GPS Service (IGS), the effect of below M-class small and faint solar flares on ionospheric total electron content (TEC) of sunlit hemisphere were analyzed. By traditional method, the results show that one cannot see and distinguish this typical flare occurred from curves for TEC and its change rate with time obtained by single line of sight (LOS) between receiver on the ground and GPS satellite, because their fluctuation levels are comparable with normal ionospheric variations, which make flare information be immerged in background noise. A data processing method name by coherent summation was used to investigate ionospheric TEC enhancement caused by a small and faint C-class SF solar flare derived from 18 GPS stations data (which is composed of more than 90 LOS at any time during flare). It is found that this method can substantially eliminate background ionospheric TEC variation ``noise'', and ionospheric response to flare is very clear and obvious by this method, which can usually only be seen in big flares. By comparison, the time characteristic of TEC variation is in good agreement with X-ray data from GOES satellite in start, peak and end time of flare occurred, and the maximum enhancement of average TEC is below 0.1 TECU, which is about one or more orders smaller than that caused by X-class large solar flares.

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