Other
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48..311h&link_type=abstract
Acta Astronomica Sinica, vol. 48, no. 3, p. 311-317
Other
Earth: Tmosphere, Gamma Rays: Bursts
Scientific paper
On 27 December 2004, at 21:30UT, a extremely intense Gamma ray flare from the soft Gamma repeater SGR1806-20 hit earth, which resulted in the additional ionization of earth's upper atmosphere exposed to this great flare. During this burst, an obvious sudden ionospheric disturbances (SID) event was recorded by multi-stations of very low frequency (VLF) observations. The X ray data from GOES satellite and the solar wind and interplanetary magnetic field (IMF) data from ACE satellite and theoretical analysis proved that the observed SID events were induced by SGR 1806-20. By using coherent summation data processing method, the response of ionospheric total electron content (TEC) derived from global positioning system (GPS) observational data to this GRB is investigated. It is found that GRB041227 evidently affected ionosphere, and the peak increase of average TEC is about 0.04TECU (1TECU=1016el/m2), which is equivalent with that caused by C or below C class solar flare. In addition, the calculated results of this paper as well as the former study results from other authors show that the remote celestial bodies can also affect near earth space environment more or less.
Gu Shi-Fen
Huang Wen-Geng
Shen Hao
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