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FXXX06 KWNP 140256
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2024 Oct 14 0247 UTC
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#                7-day Space Weather Highlights
#
Highlights of Solar and Geomagnetic Activity
07 - 13 October 2024

Solar activity reached high levels on 07 and 09 Oct. An X2.1/2b
flare was observed on 07/1902 UTC from Region 3842 (S15, L=180,
class/area=Eki/730). On 08 Oct 2 X-class flares were observed. An
X1.8 flare was observed at 09/0156 UTC from Region 3848 (N12, L=116,
class/area=Dki/600). This event was accompanied by Type II (5176
km/s) and Type IV radio sweeps as well as a 2700 sfu Tenflare and
Castelli U signature. The associated Halo CME is Earth directed and
early model runs suggest arrival mid to late day 10 Oct. An
additional X1.4/1N flare was observed from Region 3842 at 09/1545
UTC. Numerous M-class flares were observed during the period with
moderate levels being reached on 08, 10, and 11 Oct. Low levels were
observed on 12-13 Oct.

The 10 MeV proton flux reached S3 (Strong) radiation storm levels on
09-10 Oct. The greater than 10 MeV proton flux exceeded the 1000 pfu
threshold reaching S3 (Strong) levels starting at 09/1240 UTC, with
a peak of 1810 pfu at 10/1515 UTC. The greater than 100 MeV proton
flux was also above the alert threshold of 1 pfu beginning at
09/0350 UTC, with a peak of 3 pfu at 09/0805 UTC.

The greater than 2 MeV electron flux at geosynchronous orbit was at
low to moderate levels for the summary period.

Geomagnetic field activity was at G3 (Strong) levels on 08 Oct due
to CME influences. Solar wind parameters have remained elevated
since CME arrival 06 Oct. Total field has been been between 2 to 17
nT with the Bz component dropping as low as -16 nT. The Bz component
has remained largely in the southward orientation since 07/1411 UTC.
Solar wind speeds have remained around 450 km/s. The phi angle was
predominantly negative (towards the Sun) but as of 07/1916 UTC has
flipped to positive (away from the Sun).The greater than 2 MeV
electron flux at geosynchronous orbit was at low to moderate levels
for the summary period.

G4 (Severe) levels were observed on 10-11 Oct due to influences from
a halo CME that left the Sun early on 09 Oct. Solar wind parameters,
as measured by ACE, all showed abrupt jumps in value consistent with
an interplanetary shock, which was interpreted as the arrival of the
halo CME from 9 Oct associated with an X1.8 flare. Total magnetic
field, Bt, had an average of 36 nT throughout, with a maximum of 46
nT reached at 10/2159 UTC. The north-south component of the magnetic
field, Bz, varied between north (positive) and south (negative)
values. It reached a maximum southward value of -46 nT at 10/2200
UTC, with several sustained periods of -20 nT. With the arrival of
the CME, the wind speed increased from a background of 400 km/s to
815 km/s, and then sustained speeds around 750 km/s for the
remainder of the period. Before the CME, the phi angle was
predominantly positive (away from the Sun), and then varied after
the arrival.

The remainder of the period saw G2 (Moderate) levels on 07 Oct, and
G1 (Minor) levels on 09 and 12 Oct. All due to lingering CME
influences.