Skip to main content

Index Geophysics

A signal-strength model for gravity-field spectrum components in a local space


Title (Dublin Core)

A signal-strength model for gravity-field spectrum components in a local space

Description (Dublin Core)

<p>In the Earth gravity-field model, potential coefficients are projections of the Earth gravitational potential on the corresponding spherical harmonics by degree and order. These coefficients reflect the spectral composition of the Earth gravitational potential in the whole space, but they cannot reflect the spectral composition in a local area. In this study, the Earth gravitational potential was projected on spherical harmonics in a local area using a window function introduced to facilitate the mathematical expressions. Then a model for the spectral structure of the Earth gravitational potential in the local area was established. The model can reflect the signal strength of any gravity-field spectrum component in the local area, which adds information for the description of the gravity field of the Earth, and which has great significance for Earth-sciences research and satellite gravity measurements. Taking the third-degree coefficients, for example, the signal-strength distributions of potential coefficients were computed. The data show that the signal-strength distributions of third-degree coefficients on the sphere surface are independent of the longitude. Among the third-degree coefficients, the zero-order, first-order and second-order coefficients are stronger near the two poles of the Earth, while the third-order coefficient is stronger near the equator.</p>

Creator (Dublin Core)

Liu Hongwei
Wang Zhaokui
Zhang Yulin

Subject (Dublin Core)

Earth's Gravitational Potential
Local Area
Spectrum Structure
Spherical Cap Harmonic Analysis
Meteorology. Climatology
Geophysics. Cosmic physics

Publisher (Dublin Core)

Istituto Nazionale di Geofisica e Vulcanologia (INGV)

Date (Dublin Core)


Type (Dublin Core)


Identifier (Dublin Core)


Source (Dublin Core)

Annals of Geophysics, Vol 55, Iss 5 (2013)

Language (Dublin Core)


Relation (Dublin Core)

Provenance (Dublin Core)

Journal Licence: CC BY