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The correlation of flare's location on solar disc and the sudden increase of total electron content

Chinese Science Bulletin 2002年第1期47卷 82-85页

作者： zhang donghe, xiao zuo & chang qingdepartment of geophysics, peking university, beijing 100871, china Qingdao Research Center, china Research Insitute of Radio-wave Propagation, Qingdao 266071, china Department of Electronic Engineering, beijing Universit Department of geophysics Peking University Beijing China Qingdao Research Center China Research Insitute of Radio-wave Propagation Qingdao China Department of Electronic Engineering Beijing University of Aeronautics and Astronautics Beijing China

The correlation of flare’s location on solar disc with the value of sudden increase of total electron content is analyzed with flare’s parameters observed by GOES satellite from 1997 to 1999 and total electron content derived from GPS data observed by international GPS Service for Geo-dynamics. It is found that, besides the flare’s maximum X-ray flux, flare’s location on solar disc has some relation with the value of SITEC during the flare. The ionospheric response to a flare with a smaller maximum X-ray flux and nearer angular distance to the Sun’s central meridian line may be stronger than that of the flare with a larger maxi-mum X-ray flux and far angular distance. To the flares with the same class of maximum X-ray flux, the nearer the angu-lar distance to the Sun’s meridian, the stronger the ionospheric response.

关键词： flare SITEC GPS.

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The estimation method of GPS instrumental biases

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Chinese Science Bulletin 2001年第3期46卷 204-207页

作者： chang Qing zhang donghe xiao zuo zhang Qishan Department of geophysics Peking UniversityBeijing 100071China Department of Electronic Engineering Beijing University of Aeronautics and AstronauticsBeijing 100083China

A model of estimating the global positioning system (GPS) instrumental biases and the methods to calculate the relative instrumental biases of satellite and receiver are presented. The calculated results of GPS instrumental biases, the relative instrumental biases of satellite and receiver, and total electron content (TEC) are also shown. Finally, the stability of GPS instrumental biases as well as that of satellite and receiver instrumental biases are evaluated, indicating that they are very stable during a period of two months and a half.

关键词： GPS instrumental biases TEC ionosphere.

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