MMS 1 Search Coil Magnetometer (SCM) AC Magnetic Field Level 2 (L2), Survey Mode, 32 Sample/s Data

Search Coil Magnetometer (SCM) AC Magnetic Field (32 samples/s), Level 2, Survey Mode Data. The tri-axial Search-Coil Magnetometer with its associated preamplifier measures three-dimensional magnetic field fluctuations. The analog magnetic waveforms measured by the SCM are digitized and processed inside the Digital Signal Processor (DSP), collected and stored by the Central Instrument Data Processor (CIDP) via the Fields Central Electronics Box (CEB). Prior to launch, all SCM Flight models were calibrated by LPP team members at the National Magnetic Observatory, Chambon-la-Foret (Orleans). Once per orbit, each SCM transfer function is checked thanks to the onboard calibration signal provided by the DSP. The SCM is operated for the entire MMS orbit in survey mode. Within scientific Regions Of Interest (ROI), burst mode data are also acquired as well as high speed burst mode data. This SCM data set corresponds to the AC magnetic field waveforms in nanoTesla and in the GSE frame. The SCM instrument paper can be found at http://link.springer.com/article/10.1007/s11214-014-0096-9 and the SCM data product guide at https://lasp.colorado.edu/mms/sdc/public/datasets/fields/.

搜索线圈磁强计（Search Coil Magnetometer, SCM）交流磁场数据（采样率32样本/秒），属于二级勘测模式数据集。搭载配套前置放大器的三轴搜索线圈磁强计可测量三维磁场扰动。SCM采集的模拟磁波形会在数字信号处理器（Digital Signal Processor, DSP）内完成数字化与处理，随后由中央仪器数据处理器（Central Instrument Data Processor, CIDP）通过场域中央电子箱（Fields Central Electronics Box, CEB）完成收集与存储。发射前，所有SCM飞行型号仪器均由奥尔良尚邦拉福雷国家地磁观测台的LPP团队成员完成校准。每完成一个轨道周期，便会借助DSP提供的星上校准信号对单台SCM的传递函数进行校验。SCM在整个MMS轨道周期中均以勘测模式运行。在科学感兴趣区域（Regions Of Interest, ROI）内，除常规勘测模式数据外，亦可采集爆发模式数据与高速爆发模式数据。本SCM数据集对应地心太阳黄道坐标系（GSE）下、单位为纳特斯拉（nanoTesla, nT）的交流磁场波形数据。有关SCM仪器的学术论文可访问：http://link.springer.com/article/10.1007/s11214-014-0096-9；SCM数据产品指南可查阅：https://lasp.colorado.edu/mms/sdc/public/datasets/fields/。