Solar wind summary (Last 24 hours)

13th November

Solar wind parameters indicated continued elevated ambient solar wind
conditions. The IMF total field strength averaged near 6 nT while Bz
remained mostly positive, with intermittent negative deviations. Solar
wind speeds began the period near 570 km/s, but decreased to end of
period speeds near 460 km/s. Phi angle remained in a negative (towards)
sector throughout the period.

11th November

Early solar wind parameters indicated the continued influence of the 07
Nov CME combined with coronal hole high speed stream (CH HSS) effects.
The IMF total field strength began the period near 12 nT, then slowly
decreased to average near 10 nT for the majority of the period. The Bz
component was mostly positive, seeing isolated southern deviations as
low as -9 nT. Solar wind speeds remained near 500 km/s, dropping for a
brief period to average near 450 km/s. Phi angle was mostly oriented in
a negative (towards) sector.

29th October

The solar wind environment at ACE remained slightly enhanced during the
period. Solar winds averaged near 400 km/s for most of the period,
before decreasing to the mid to upper 300s by the end. Bt displayed a
very slow and steady decrease from 7 nT to end-of-period values near 5
nT. Bz fluctuated between +/- 6 nT throughout much of the period. Phi
remained positive through most of the period, aside from an isolated
rotation into a negative sector just before 29/0800 UTC for
approximately 30 minutes.

27th October

Solar wind parameters indicated a continued nominal solar wind
environment. Solar wind speeds were steady near 400 km/s, IMF total
field values were steady near 7 nT, and Bz ranged between +6 nT and -7
nT. The phi angle was steady in a positive (away) solar sector
throughout the period.

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
effects.

24th October

Solar wind parameters were indicative of a nominal solar wind regime.
Solar wind speeds were relatively steady between 400-500 km/s. IMF
total field values ranged between 2-7 nT and Bz was predominately
southward throughout the period, reaching a maximum southward component
of -5 nT mid-period. The phi angle was stable in a positive (away)
sector throughout the period.

22nd October

Observations from the ACE spacecraft reflected the waning influence of a
high speed solar wind stream. Speed declined through the period,
beginning near 650 km/s and ending near 450 km/s. Phi remained positive.
Bt was at or below 7 nT and Bz never dipped below -6 nT. Density began
a slow rise after 22/0000 UTC while temperature began to decline.

21st October

Solar wind measurements at the ACE spacecraft reflected the influence of
a positive polarity coronal hole high speed stream (CH HSS). Wind speed
began around 500 km/s and increased to near 600 km/s by 21/0500 UTC and
to almost 700 km/s by the end of the period. Phi remained positive. Bt
was at or below 10 nT while Bz fluctuated between 7 and -9 nT in the
first half of the period, becoming mostly positive or neutral after
21/0000 UTC.

20th October

Solar wind parameters indicated the likely onset of a positive polarity
coronal hole high speed stream (CH HSS) at around 20/1800 UTC. Solar
wind speeds were steady between 375-475 km/s through 20/0800 UTC when
wind speeds increased to near 550 km/s. IMF total field values were
steady between 5-11 nT and Bz varied between +8 nT and -8 nT. The phi
angle was steady in a positive (away) solar sector throughout the
period.

18th October

Solar wind parameters at ACE were indicative of a nominal solar wind
regime. Solar wind speeds were steady in the 400-500 km/s range. IMF
total field values reached 8 nT and Bz reached a maximum southward
component of -7 nT. The phi angle was variable between negative
(toward) and positive (away) solar sectors throughout the period,
suggesting multiple solar sector boundary crossings (SSBCs).