Assertion: solar magnetic field | /r/HasProperty | monitored in real time
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text: The field varies in strength near the Earth from 1 to 37 nT, averaging about 6 nT. Since 1997, the solar magnetic field has been monitored in real time by the Advanced Composition Explorer (ACE) satellite located in a halo orbit at the Sun-Earth Lagrange Point L1; since July 2016 it is being monitored by the Deep Space Climate Observatory (DSCOVR) satellite, also at Sun-Earth L1 (with the ACE continuing to serve as a back-up measurement).