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Issued on 2021 Jun 30 0822 UTC
A small fast forward shock is observed at 2:47UT in Solar wind data as measured by DSCOVR. Solar wind speed jumped from 327 km/s to 354 km/s and magnetic field jumped from 3nT to 5nT. Density and temperature approximately doubled. It may be an early feature related to the enhancements expected later in the day associated to the coronal hole that passed central meridian June 27.