CALCULATIONS AND ANALYSES OF VERTICAL GRADIENT OF THE GEOMAGNETIC FIELD IN CHINA AND ADJACENT AREAS

An Zhen-chang; Wang Yue-hua; Xu Yuan-fang

doi:10.11728/cjss1991.01.014

Volume 11 Issue 1

Jan. 1991

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An Zhen-chang, Wang Yue-hua, Xu Yuan-fang. CALCULATIONS AND ANALYSES OF VERTICAL GRADIENT OF THE GEOMAGNETIC FIELD IN CHINA AND ADJACENT AREAS[J]. Chinese Journal of Space Science, 1991, 11(1): 14-23. doi: 10.11728/cjss1991.01.014

Citation:

An Zhen-chang, Wang Yue-hua, Xu Yuan-fang. CALCULATIONS AND ANALYSES OF VERTICAL GRADIENT OF THE GEOMAGNETIC FIELD IN CHINA AND ADJACENT AREAS[J]. Chinese Journal of Space Science, 1991, 11(1): 14-23. doi: 10.11728/cjss1991.01.014

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CALCULATIONS AND ANALYSES OF VERTICAL GRADIENT OF THE GEOMAGNETIC FIELD IN CHINA AND ADJACENT AREAS

doi: 10.11728/cjss1991.01.014 cstr: 32142.14.cjss1991.01.014

Institute of Geophysics, Academia Sinica, Beijing

Received Date: 1990-03-24
Rev Recd Date: 1900-01-01
Publish Date: 1991-01-24

Abstract

Abstract

In this paper, based on the spherical harmonic model of the geomagnetic field, the spherical harmonic expressions of the vertical gradient of the geomagnetic field are given. The grid values of the geomagnetic field and its vertical gradient at 0.50, 100km above sea level are calculated. The contour maps of the vertical gradient of total intensity, vertical intensity, horizontal intensity and declination are drawn. The geographical distribution and change with height of the vertical gradient of the geomagnetic field are analysed.
- Spherical harmonic model of the geomagnetic field,
- Vertical gradient,
- Contour map