25th October

Solar wind parameters were indicative of waning coronal hole high speed
stream (CH HSS) influence. Solar wind speeds decreased from initial
values near 440-470 km/s to end-of-period values near 400 km/s. IMF
total field values were steady near 4-6 nT and Bz reached a maximum
southward component of -5 nT, and was predominately southward throughout
the period. The phi angle was steady in a positive (away) sector
throughout most of the period but began to transition to a negative
(toward) sector after 25/0900 UTC, likely marking the end of CH HSS

Leave a Reply