Cluster 3 STAFF Prime Parameters

This data set contains the Cluster 3 STAFF Prime Parameters (spin time resolution) : the parallel and perpendicular (to the FGM measured magnetic field) power of the magnetic field and the power of the spin-plane components of the electric field for several frequency ranges. Caveats The STAFF prime parameters do not have the standard CSDS timing which is synchronous with the spacecraft spin clock. The operation of the STAFF digital spectrum analyser is synchronised with the DWP clock. The summary parameters are the average of all those instrument measurements made during STAFF 4 s periods whose middle times lie within the minute boundaries. The difference from the standard CSDS definition is negligible for all practical purposes. The summary parameter and prime parameter E_pow_f2 is supplied by STAFF only when the satellites are in normal mode. In burst mode both STAFF and EFW measure the waveform to 180 Hz, and the onboard spectrum analyser is not used to determine the spectrum in the band 10--180 Hz. The parameters B_pow_f2, E_pow_f2, B_par_f2, and B_perp_f2 are determined from the waveform measurements which, in the case of the electric field, come from EFW. Thus in normal mode the parameter E_pow_f2 is supplied by STAFF, while in burst mode it is replaced by the parameter of the same name from the EFW experiment.

本数据集涵盖Cluster 3的STAFF核心参数（自旋时间分辨率）：包含多个频段下，磁场平行于、垂直于FGM（磁通门磁强计）所测磁场方向的功率，以及电场自旋平面分量的功率。

注意事项：STAFF核心参数未采用与航天器自旋时钟同步的标准CSDS（Cluster科学数据系统）时序，但其数字频谱分析仪的运行与DWP时钟保持同步。汇总参数为STAFF 4秒观测时段内所有仪器测量值的平均值，且该时段的中间时刻需落在整分钟边界范围内。相较于标准CSDS定义，该差异在所有实际应用场景中均可忽略不计。

仅当卫星处于正常工作模式时，STAFF才会提供汇总参数与核心参数E_pow_f2。在突发模式下，STAFF与EFW（电场与波仪器）均可采集180Hz及以下的波形数据，且此时不会启用星载频谱分析仪来计算10~180Hz频段内的频谱。

参数B_pow_f2、E_pow_f2、B_par_f2及B_perp_f2均由波形测量结果计算得到，其中电场相关的测量数据取自EFW。因此，在正常工作模式下，参数E_pow_f2由STAFF提供；而在突发模式下，该参数将由EFW实验获取的同名参数替代。