089
FXXX06 KWNP 310256
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2025 Mar 31 0224 UTC
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#                7-day Space Weather Highlights
#
Highlights of Solar and Geomagnetic Activity
24 - 30 March 2025

Solar activity was low on 24-25 Mar, moderate on 26-27 Mar and 29
Mar, and high on 28 Mar and 30 Mar. High levels were reached on 28
Mar as the strongest event of the period, an X1.1 (R3-Strong) flare
at 28/1521 UTC from yet-to-be-numbered Region 4046 (N05, L=301,
class/area=Dho/270 on 30 Mar), was produced on the Sun's eastern
limb. Associated with the event was a Type IV radio sweep and a
Tenflare (380 sfu). The resulting fast-moving CME was analyzed and
modelled. The results suggested the far flank of the CME would pass
close, but ultimately miss Earth. High solar activity levels were
again reached on 30 Mar due to frequent R1 flares from Region 4048
(S15, L=281, class/area=Eki/300 on 30 Mar). A total of six events
were observed, the largest of which was an M1.6 (R1) flare at
30/1642 UTC.

Other activity included Type II radio sweeps on 25 Mar and 26 Mar.
Both of these events were associated with non-Earth-directed CME
events on or beyond the W. limb.

No proton events were observed at geosynchronous orbit. However, an
increase above background was observed two days after the X1.1 flare
at 28/1521 UTC from the Sun's eastern limb. Although delayed,
the rise in proton flux is likely related to this event.

The greater than 2 MeV electron flux at geosynchronous orbit climbed
to high levels on 27-30 Mar. This increase in electron flux was
caused by the influence of a strong, positive polarity CH HSS, which
began around 26 Mar.

Geomagnetic field activity ranged from quiet to G2 (Moderate)
geomagnetic storms. Active conditions on 24 Mar were associated with
the passage of a CME that left the Sun on 21 Mar. On 25 Mar active
conditions were again observed due to the onset of CIR ahead of a
positive polarity CH HSS. Geomagnetic activity increased to G2
(Moderate) levels on 26 Mar as total magnetic field strength reached
a brief peak of 29 nT and the Bz component reached as far south as
-27 nT. Wind speeds increased from above ~600 km/s on 26 Mar to
above ~800 km/s on 27 Mar. The geomagnetic field responded with a
mix of active to G1 (Minor) storm conditions. As total magnetic
field strength and solar wind speeds declined on 28 Mar, geomagnetic
conditions decreased to mostly unsettled to active levels. During
the final waning stage of the positive polarity CH, an isolated
period of active was last observed early on 29 Mar and only quiet
conditions were observed over 30 Mar.