Weekly Highlights of Solar and Geomagnetic Activity, 11 - 17 October 2021

[SWPC.We...@noaa.gov]

:Product: Weekly Highlights and Forecasts
:Issued: 2021 Oct 18 0131 UTC
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# Weekly Highlights and Forecasts
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Highlights of Solar and Geomagnetic Activity
11 - 17 October 2021

Solar activity was very low with B-class flare activity on 11-12,
and 15-17 Oct. Low levels of solar activity were observed on 13-14
Oct due to C-class flare activity. Region 2885 (N15, L=171,
class/area=Cro/20 on 13 Oct) produced three C-class flares this
period: a C1/Sf flare at 13/2204 UTC, a C2 flare at 14/0134 UTC, and
a C1flare at 14/0304 UTC.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was
normal to moderate throughout the period.

Geomagnetic field activity reached G1-G2 (Minor-Moderate)
geomagnetic storm levels on 12 Oct due to the passage of a CME from
09 Oct. Quiet to active conditions were observed on 17 Oct, also due
to the passage of a transient feature. Quiet to unsettled conditions
were observed on 11, 13, and16 Oct, while quiet conditions were
observed throughout the remainder of the period.

Forecast of Solar and Geomagnetic Activity
18 October - 13 November 2021

Solar activity is expected to be very low to low throughout the
outlook period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to reach high levels on 26-28 Oct. Normal to moderate flux
levels are expected to prevail throughout the remainder of the
outlook period.

Geomagnetic field activity is expected to reach active levels on
18-19 Oct, and 06 Nov due to the influence of multiple, recurrent CH
HSSs. The remainder of the outlook period is expected to be mostly
quiet or quiet to unsettled.