Study on noise in simultaneous geomagnetic difference data caused by the effect of Sq local-time variation

A new concept is suggested on tectonomagnetic research about the noise in simultaneous geomagnetic difference data caused by the effect of Sq local-time variation, together with the method of theoretical calculation. The level of the noise and its contribution to the total noises of the differences...

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Bibliographic Details
Published inActa seismologica sinica Vol. 19; no. 1; pp. 87 - 92
Main Author Ren, Xi-Xian
Format Journal Article
LanguageChinese
English
Published Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 01.01.2006
Subjects
same latitude
noise
solar-quiet-day variation Sq
local-time variation
simultaneous difference data
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Summary:A new concept is suggested on tectonomagnetic research about the noise in simultaneous geomagnetic difference data caused by the effect of Sq local-time variation, together with the method of theoretical calculation. The level of the noise and its contribution to the total noises of the differences data are analyzed. The result indicates that the noise increases linearly with the increase of the distance between the two stations in the range of 40 deg longitude-difference, and its increasing rate is about 0.4 nT/( deg ) at latitude 40 deg N. The example calculated at a pair of sites with longitude-difference 0.357 deg , shows that the noise is about one fifth of the total noises of the difference data on geomagnetic quiet-day.
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ISSN:1000-9116
1993-1344