20th August


Yesterday’s CME continues to pass Earth. Bt peaked near 22 nT at
20/0427 UTC. Bz varied between -11 nT and 21 nT following the CME’s
passage, reaching a maximum southward deflection of -16 nT at 19/1936
UTC. It turned positive after 19/2131 UTC and has remained strongly
positive since. Phi was predominately positive through 19/2130 UTC
before rotating to a negative (towards) orientation where it remains.

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