Taking the sampled every minute values of the horizontal, declination and vertical components H, D, Z and theintensity of total field F calculated from H and Z on the magnetograms at ten geomagnetic observatories in C...Taking the sampled every minute values of the horizontal, declination and vertical components H, D, Z and theintensity of total field F calculated from H and Z on the magnetograms at ten geomagnetic observatories in Chinain the same periods, and at the china Antarctic Great wan station (CAGWS), the authors conducted the maximum entropy analysis and band-pass filtration of these data and obtained the following results: (1) At the PeriodT=10-90 min geomagnetic solar flare effect (sfe) is evident on the sunlit hemisphere. It is more pronounced atperiods 15, 20, 25 and 30 min, and most prominent at 30-35 min. The solar X-ray spectra at the same timeshowed their peaks at 10 and 15 min ; (2) The period T=10-70 min of sfe at the CAGWS in the westernHemisphere was also recognizable after spectral analysis and filtration, but the corresponding period of the maximum amplitude was different from that in the sunlit hemisphere. The results further proved that the geomagnetic effect of solar flares could also be observed in the dark hemisphere I (3) The subsolar POints of two solar flareswere found around Lanzhou, and the associated current density in the ionosphere was about 24 A/km. Thetransitional zone from positive to negative sfe was found around the geographic latitude p￣ 22'-- 24'N, wherethe sfe in H-crochet was almost illegible.展开更多
文摘Taking the sampled every minute values of the horizontal, declination and vertical components H, D, Z and theintensity of total field F calculated from H and Z on the magnetograms at ten geomagnetic observatories in Chinain the same periods, and at the china Antarctic Great wan station (CAGWS), the authors conducted the maximum entropy analysis and band-pass filtration of these data and obtained the following results: (1) At the PeriodT=10-90 min geomagnetic solar flare effect (sfe) is evident on the sunlit hemisphere. It is more pronounced atperiods 15, 20, 25 and 30 min, and most prominent at 30-35 min. The solar X-ray spectra at the same timeshowed their peaks at 10 and 15 min ; (2) The period T=10-70 min of sfe at the CAGWS in the westernHemisphere was also recognizable after spectral analysis and filtration, but the corresponding period of the maximum amplitude was different from that in the sunlit hemisphere. The results further proved that the geomagnetic effect of solar flares could also be observed in the dark hemisphere I (3) The subsolar POints of two solar flareswere found around Lanzhou, and the associated current density in the ionosphere was about 24 A/km. Thetransitional zone from positive to negative sfe was found around the geographic latitude p￣ 22'-- 24'N, wherethe sfe in H-crochet was almost illegible.
