GSFC Magnetometer

Each sensor of the GSFC-supplied, boom-mounted triaxial fluxgate
magnetometer had dual ranges of minus to plus 24 nT and 64 nT, with digitization
resolutions of minus to plus 0.094 nT and 0.25 nT, respectively. Zero level drift
was checked by periodic reorientation of the sensors until May 20, 1969, when the
flipper mechanism failed. Past this point, data analysis was more difficult as the
zero level drift of the sensor parallel to the spacecraft spin axis was not readily
determined. Spacecraft interference was less than 0.125 nT. One vector measurement
was obtained each 5.12 s. The bandpass of the magnetometer was 0 to 5 Hz, with a
20-dB per decade decrease for higher frequencies. Except for the flipper failure,
the experiment functioned normally from launch to spacecraft turnoff (June 24, 1973).
For further details, see Ness et al., J. Geophys. Res., v. 72, p. 5769, 1969.
There was also a NASA/ARC-supplied magnetometer on Explorer 35.

该数据集由美国宇航局喷气推进实验室（GSFC）提供的、安装在桁架上的三轴霍尔效应磁力计所采集。该磁力计具有负至正24纳特和64纳特的量程，分别具有负至正0.094纳特和0.25纳特的数字化分辨率。通过周期性地重新定位传感器直至1969年5月20日，当翻动机制失效前，均对零点漂移进行了校验。在此之后，由于与航天器自旋轴平行的传感器零点漂移难以确定，数据分析变得更为复杂。航天器干扰小于0.125纳特。每5.12秒进行一次矢量测量。磁力计的带通范围为0至5赫兹，频率每增加十倍，衰减20分贝。除翻动机制故障外，自发射至航天器关闭（1973年6月24日）期间，实验运行正常。欲了解更多详细信息，请参阅Ness等人发表在《地球物理研究杂志》（J. Geophys. Res.）第72卷第5769页的文章，1969年。此外，在探险者35号上还搭载了一台由NASA/ARC提供的磁力计。