Application of magneto-impedance (MI) sensor to geomagnetic field measurements
Application of magneto-impedance (MI) sensor to geomagnetic field measurements
复制标题
磁阻抗（MI）传感器在地磁场测量中的应用
DOI：
10.1029/2022ja030809
复制
发表时间：
2022
影响因子：
--
通讯作者：
and H. Aoyama
中科院分区：
文献类型：
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作者：
Nose;M.;T. Kawano;and H. Aoyama
磁阻抗(MI)效应是在大约30年前发现的，利用这种效应的微型磁性传感器已经投入商业使用。我们对商业上可用的MI传感器进行了一些修改，以覆盖地磁场的动态范围。包括改装在内的两个水平部件和一个垂直部件的三个MI传感器的总成本大约是三轴磁通门磁强计传感器标准价格的三分之一。2018年3月30日至4月27日期间，我们在位于日本京都西北约100公里的Mineyama天文台使用MI传感器磁强计(MIM)进行了地磁场变化的实验观测。将MIM获得的数据与一直在天文台工作的磁通门磁力仪(FGM)的数据进行了比较。结果表明，MIM可以记录地磁场的变化，如地磁暴、太阳平静变化、低纬正海湾、风暴突然开始以及峰峰值为≤1 nT的长周期地磁脉动，这一点也可以用功能梯度法检测到。用MIM和FGM测得的地磁场变化的功率谱基本相同。结果表明，MIM比FGM具有更大的温度漂移。研究表明，MIM在几十秒到几小时的时间内测量的地磁场变化与功能梯度法相当，对高层大气物理或空间物理的研究是有用的。
The magneto‐impedance (MI) effect was discovered about 30 years ago and a microsize magnetic sensor utilizing this effect has become commercially available. We make some modifications to the commercially available MI sensors to cover the dynamic range of the geomagnetic field. The total cost of three MI sensors for the two horizontal components and one vertical component including the modification is approximately one‐third of the standard price of triaxial fluxgate magnetometer sensors. For the period of 30 March to 27 April 2018, we conducted experimental observations of geomagnetic field variations with the MI sensor magnetometer (MIM) at the Mineyama observatory, which is located about 100 km northwest of Kyoto, Japan. Data obtained with the MIM are compared with those from the fluxgate magnetometer (FGM) that has been working at the observatory. Results show that the MIM can record geomagnetic field variations such as geomagnetic storm, solar quiet variations, low‐latitude positive bays, storm sudden commencement, and long‐period geomagnetic pulsations with a peak‐to‐peak amplitude of ≤1 nT that is also detected with the FGM. Power spectra of the geomagnetic field variations measured with the MIM and FGM are almost the same. It is found that the MIM has a larger temperature drift than the FGM. The present study reveals that the MIM is comparable to the FGM in measuring the geomagnetic field variations in a period from a few tens of seconds to a few hours and is useful for researches in upper atmospheric physics or space physics.