The influence of two typical kinds of magnetic disturbance on the airborne magnetic survey
-
摘要: 磁扰是磁暴发生期内间断性出现的地磁场扰动变化,可以出现在磁暴的不同阶段,其幅度和形态与磁暴的规模和类型相关,规模较大的磁暴期间出现的磁扰比规模较小的磁暴期间出现的磁扰幅度大、频次高、持续时间长。研究发现,实际生产中最常见的磁扰幅度一般在几纳特至十几纳特,形态主要呈线性梯度变化和非线性扰动变化,这两种典型磁扰对磁测结果均有影响,经过磁日变校正能够消除。结合生产实例,探讨了磁日变校正对消除磁扰的作用。Abstract: Magnetic disturbance is disturbance change of Earth magnetic field which occurs discontinuously during the occurrence of magnetic storm. It can happen at different stages of magnetic storm, Its range and shape are related to the scale and type of magnetic storm. The magnetic disturbance that occurs during magnetic storm of rather large?scale shows larger range and higher frequency and lasts longer period than that during magnetic storm of fairly small?scale.Researches show that the range of magnetic disturbance in prac?tical work varies between several nanotesla to more than ten nanotesla, and the shape mainly exhibits linear gradient variation and non?linear disturbance variation. These two typical kinds of magnetic disturbance both affect the result of magnetic survey, and can be elimi?nated through magnetic diurnal variation correction. In combination with practical work, this paper deals with the utilization of magnetic diurnal variation correction to eliminate magnetic disturbance.
-
-
计量
- 文章访问数: 272
- PDF下载数: 19
- 施引文献: 0
下载: