Solar wind summary (Last 24 hours)

9th November

Solar wind parameters, measured at ACE, indicated the arrival of the
anticipated positive polarity coronal hole high speed stream (CH HSS).
Solar wind speed began the period ranging from 375 – 430 km/s. At
approximately 09/0450 UTC, speeds began a steady climb to near 470 km/s,
temperature and density increased simultaneously, and the phi angle
began changing to positive (away) orientation. Total field strength
increased to near 14 nT while the Bz component dropped to -14 nT. By the
end of the period, speeds had reached over 500 km/s and the phi angle
was solidly in a positive (away) orientation.

Solar wind summary

Solar wind parameters, measured at ACE, were indicative of background
conditions. Solar wind speed was relatively steady in the 340 – 410 km/s
range. The total field strength ranged from 10 nT to 1 nT and the Bz
component ranged from +6 nT to -5 nT. The phi angle began the period in
a positive (away) sector and transitioned to a predominantly negative
(toward) sector after 07/1320 UTC. Phi stayed negative, with some minor
variability, through the end of the period.

Solar wind summary

Solar wind parameters, as measured by the ACE spacecraft, showed the
influence of a weak, negative-polarity coronal hole high-speed stream
(CH HSS). Wind speed began a steady increase starting at approximately
07/0400 UTC and reached a peak of 396 km/s at 07/0827 UTC. The total
interplanetary magnetic field ranged between +13.5 nT and +3.9 nT while
the Bz component hit -9.9 nT at 07/1002 UTC. The phi angle started the
period oriented in a positive (away) solar sector but underwent a solar
sector boundary crossing to a negative (toward) orientation at
approximately 07/0400 UTC. Phi shifted to a positive (away) sector at
07/1122 UTC to end the period.

Solar wind summary

Solar wind parameters, as measured by the ACE spacecraft, were
indicative of background conditions. Wind speed reached a peak of 368
km/s at 06/0838 UTC. The total interplanetary magnetic field ranged
between +3 nT and +5 nt. The Bz component did not drop lower than -3 nT
and was predominately positive. The phi angle remained oriented in a
positive (away) solar sector throughout the period.

Solar wind summary

Solar wind parameters, as measured by the ACE spacecraft, were at
slightly elevated levels with solar wind speed between approximately 314
km/s and 435 km/s. Total field varied between 4 and 7 nT and the IMF Bz
component reached as low as -5 nT. The phi angle remained oriented
in a positive (away) sector throughout the period.

Solar wind summary

Solar wind parameters, as measured by the ACE spacecraft, were at
background levels with solar wind speed around 350 km/s and total field
strength relatively steady near 6 nT. The IMF Bz component fluctuated
between +/- 5 nT. The phi angle remained oriented in a positive (away)
sector throughout the period.

Solar wind summary

Solar wind speed was variable in the 350-375 km/s range. Total field
strength was steady at about 6 nT while the Bz component ranged from +/-
5 nT. The phi angle indicated a positive (away) sector during the
period.

Solar wind summary

Solar wind parameters were at nominal background levels. Solar wind
speed was steady at about 350 km/s. Total field strength ranged was
about 3 nT with the Bz component near +/- 0 nT. The phi angle indicated
a negative (toward) sector throughout the period.

Solar wind summary

Solar wind parameters, measured at ACE, were indicative of a nominal
solar wind environment for the latter half of the UT day, indicating the
return to background levels. This comes following the increased CME
activity that observed solar winds peak during the period at 481 km/s
and IMF Bt reach a maximum of 12 nT. IMF Bz reached a maximum southward
deviation of -8 nT, and the phi angle turn slightly positive (away) for
a brief period. As the CME effects waned, solar wind speed ended the
period steady in the 360 km/s – 390 km/s range, total field strength was
steady near 5 nT and the Bz component ranged from +2 nT to -4 nT. Phi
data suggested continued negative (towards) sector orientation
throughout the remainder of the period.

Solar wind summary

Solar wind parameters at ACE indicated the arrival of the expected weak
transient CME from the 28 Oct M4 flare at approximately 31/0930 UTC. ACE
MAG/SWEPAM sensors indicated a slight rise in temperature and density as
well as fluctuations in the IMF phi, IMF Bt increased to over 12 nT, and
solar winds increase to just over 400 km/s. Prior to this, solar wind
parameters were at nearly background levels for most of the period.