期刊
ANNALES GEOPHYSICAE
卷 28, 期 9, 页码 1795-1805出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-28-1795-2010
关键词
Geomagnetism and paleomagnetism; Rapid time variations; Ionosphere; Electric fields and currents; Modeling and forecasting
资金
- Science and Technology Facilities Council (STFC)
- NERC [bgs05003] Funding Source: UKRI
- Natural Environment Research Council [bgs05003, NER/O/S/2003/00674] Funding Source: researchfish
A physically-based technique for interpolating external magnetic field disturbances across large spatial areas can be achieved with the Spherical Elementary Current System (SECS) method using data from ground-based magnetic observatories. The SECS method represents complex electrical current systems as a simple set of equivalent currents placed at a specific height in the ionosphere. The magnetic field recorded at observatories can be used to invert for the electrical currents, which can subsequently be employed to interpolate or extrapolate the magnetic field across a large area. We show that, in addition to the ionospheric currents, inverting for induced subsurface current systems can result in strong improvements to the estimate of the interpolated magnetic field. We investigate the application of the SECS method at mid- to high geomagnetic latitudes using a series of observatory networks to test the performance of the external field interpolation over large distances. We demonstrate that relatively few observatories are required to produce an estimate that is better than either assuming no external field change or interpolation using latitudinal weighting of data from two other observatories.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据