Quiet-time magnetic variations at high latitude observatories
Quiet-time magnetic variations at high latitude observatories
复制标题
高纬度天文台安静时磁力变化
DOI：
10.1186/bf03352490
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
P. Ritter
中科院分区：
文献类型：
--
作者：
I. Sillanpää;H. Lühr;A. Viljanen;P. Ritter
到目前为止，对高纬度地区的地磁静时变化还没有系统的研究。本文介绍了利用IMAGE磁力计网络在芬诺斯坎迪亚和斯瓦尔巴群岛进行的两年多连续磁观测的静时变化结果。发现CHAMP CO2模型具有简单的线性趋势，可以产生很好的长期变化校正。给出了磁层环电流对各分量静时场值的影响，并给出了与DST指数的预期线性相关系数。在54至68度的CGM纬度范围内，这些系数有一个总的趋势。在这个地区，日变化与预期的季节性Sq行为完全一致。在芬诺斯坎德大陆北部，夏时制系数和日变化表现出一种意想不到的行为，而额外的电流系统被认为是一个可能的原因。本研究中使用的一种客观的、自动化的基线方法也被介绍为一种适用于各种应用的方法。
The quiet-time geomagnetic variations at high latitudes have not been systematically studied so far. Here we present quiet-time variation results from more than two years of continuous magnetic observations in Fennoscandia and Svalbard using the IMAGE magnetometer network. The CHAMP CO2 model is found to yield an excellent secular variation correction with a simple linear trend. The effect of the magnetospheric ring current on the quiet-time field values for each component is presented with the coefficients for the expected linear correlation with the DST index. A general trend for these coefficients is found for the CGM latitudes from 54 to 68 degrees. In this area the diurnal variation is well in accordance with the expected seasonal Sq behaviour. North of the Fennoscandian mainland the DST coefficients and the diurnal variations show an unexpected behaviour and additional current systems are presented as a likely cause. An objective, automated baseline method used in this study is also introduced as a method useful for various applications.