Solar wind summary (Last 24 hours)

21st November


Solar wind speeds were indicative of nominal background conditions,
ending the period under 350 km/s. Total field steadily decreased from 4
nT at the beginning of the period to just under 2 nT at the end. The Bz
component was variable between +/- 3 nT at the beginning of the period,
but ended the period fairly steady near 1 nT. Phi angle was mostly
negative (toward) with occasional minor deviations into a positive
(away) sector.

20th November


Solar wind speeds were nominal and averaged around 390 km/s. Total field
was fairly steady near 4 nT with the Bz component variable between +/-4
nT. Phi angle was mostly negative (toward) with minor deviations into a
positive (away) sector.

19th November


Solar wind speeds were nominal and averaged well below 400 km/s. A peak
speed of 424 km/s was observed briefly at 18/2106 UTC. Total field was
fairly steady ranging from 1 nT to 3 nT with the Bz component variable
between +/-3 nT. Phi angle was mostly negative (toward) with minor
deviations into a positive (away) sector.

18th November


Solar wind speed was in decline as coronal hole high speed stream
effects diminished. Solar wind speed reached 478 km/s early in the
period and had decreased to end of period values near 390 km/s. Total
field was fairly steady ranging from 1 nT to 3 nT with the Bz component
variable between +/-3 nT. Phi angle was mostly negative (towards) with
minor deviations into a positive (away) sector.

17th November


Solar wind conditions continued under the influence of a negative
polarity coronal hole high speed stream (CH HSS) during the period.
Solar wind speed increased to 578 km/s early in the period before
becoming variable between 464 km/s to 566 km/s. Total field was
initially as high as 11 nT with the Bz component variable between -6 nT
and 11 nT. Total field slowly decreased to 3 nT by 17/0221 UTC with the
Bz variable between +/-3 nT and remained fairly steady at those levels
through the end of the period. Phi angle was mostly negative (towards)
through the period.

16th November


The solar wind began the period at nominal levels. By 15/1915 UTC,
total field increased to 10 nT followed by the Bz component increasing
southward to -8 nT. The Bz component remained southward for a prolonged
period until 16/0143 UTC. By approximately 16/0400 UTC, solar wind
speed began to slowly increase along with temperature indicative of the
onset of a negative polarity coronal hole high speed stream (CH HSS).
Total field ranged from 1 nT to 12 nT with the Bz component between +12
nT and -10 nT. Solar wind speed increased to end of period values near
480 km/s. Phi angle was mostly negative (towards) with minor deviations
into a positive (away) sector before 16/0142 UTC and became fairly
steady in a negative sector for the remainder of the period.

15th November


The solar wind was at nominal levels during the period. Solar wind
speed ranged from 326 km/s to 405 km/s with the total field between 1 nT
and 5 nT. The Bz component was mostly southward ranging from +1 nT to
-5 nT. Phi angle was predominantly negative (towards) through the
period.

14th November


The solar wind environment at the ACE spacecraft reflected ambient
background solar wind conditions. Wind speeds averaged in the mid 300
km/s range through the period. IMF Bt fluctuated between 4 nT and 0 nT
and the Bz component of the IMF ranged from -2 nT to +3 nT throughout
most of the period. Phi angle remained mostly in a positive (away)
orientation throughout the day with a few brief sector transitions
occurring intermittently.

13th November


The solar wind environment at the ACE spacecraft reflected nominal solar
wind conditions. Wind speed began the period ranging between just above
400 km/s to nearly 460 km/s, but steadily decreased to near 385 km/s
range by the end of the period. IMF Bt remained steady near 4 nT for
most of the period. The Bz component of the IMF remained mostly positive
until just after the new UT day. It then transitioned to mostly
negative, ranging from 0 to -3 nT to end the period. Phi angle remained
in a positive (away) orientation throughout the day.

12th November


Solar wind parameters, measured at the ACE spacecraft, were consistent
with diminishing CH HSS influence. Solar wind speeds began the period
near 550 km/s, but steadily decreased by the end of the period to
approximately 410 km/s. The total field strength ranged from 2 nT to 8
nT for most of the period and settled in at approximately 5 nT by the
end of the period. The Bz component fluctuated between -5 nT to +5 nT,
ending the period at +3 nT. Following the transition from negative
(toward) to positive (away) orientation around 11/1743 UTC, the phi
angle of the solar wind remained in a mostly positive (away) orientation
to finish the period.