These are magnetometer data (MISCHA) from the Vega 1 spacecraft flyby of comet Halley, 28 Feb 1986 through 10 Mar 1986.

 
Citation Delva, M., and A. V. Dyachkov, VEGA1 HALLEY FLYBY MAGNETOMETER DATA, VEGA1-C-MISCHA-3-RDR-HALLEY-V1.0, NASA Planetary Data System, 1997.
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Data Set Abstract On MARCH 6, 1986, AT 7:20:06 UT, the Vega spacecraft passed the nucleus of comet Halley at a distance of 8,890 km with a relative velocity of 78 km/s. The magnetic field experiments MISCHA carried four fluxgate sensors, with three sensors mounted on a boom at the end of the solar panels and the fourth sensor mounted one meter closer. During the cruise phase, the TRASSA-1 mode of the instrument (1 vector/2.5 min) was used. The sensors were switched to the TRASSA-2 mode (1 vector/min) during the flyby which started roughly two days before the encounter. From 3 h before closest approach (CA) until 1 hour after CA, the HS-mode (1 vector/6s) and the DT-mode (1 vector/100ms) was used [DELVAETAL1991].
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    Additional Information
    Mission Information VEGA 1
    Data Set Information VEGA1-C-MISCHA-3-RDR-HALLEY-V1.0
    Instrument Host Information VEGA1
    Instrument Information MISCHA
    Target Information 1P/HALLEY 1 (1682 Q1)
    HALLEY