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IR0EQ > DX 25.10.21 20:58l 60 Lines 2582 Bytes #999 (0) @ WW
BID : 45505IR0EQ
Read: GUEST
Subj: Weekly Highlights of Solar and Geomagnetic Activity, 18 - 24
Path: IW8PGT<HB9ON<IW2OHX<IW0QNL<VE2PKT<I0OJJ
Sent: 211025/1756z @:I0OJJ.ITA.EU [Rome] $:45505IR0EQ
:Product: Weekly Highlights and Forecasts
:Issued: 2021 Oct 25 0403 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# https://www.swpc.noaa.gov/content/subscription-services
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
18 - 24 October 2021
Solar activity was very low. Background x-ray enhancement began on
20 Oct as new Regions 2886 (S19, L= 338, class/area Hsx/185 on 19
Oct) and 2887 (S25, L=278, class/area Dki/440 on 24 Oct) emerged
around the SE limb on 17 Oct and 21 Oct, respectively. Region 2886
was quiet and stable while Region 2887 produced the majority of the
B-class flare activity. The largest flare of the period was a B9.6
flare at 22/1838 UTC from a region just beyond the East limb. No
Earth-directed CMEs were observed.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels with a peak flux of 433 pfu at 18/1700
UTC.
Geomagnetic field activity ranged from quiet to active levels. The
period began under the influence of a weak transient with total
field reaching 13 nT and the Bz component reaching -8 nT late on 17
Oct. Solar wind speed ranged from 325-385 km/s during this time.
Slightly perturbed conditions continued on 19-20 Oct as a solar
sector boundary crossing followed by a co-rotating interaction
region preceded the onset of a negative polarity coronal hole high
speed stream (CH HSS). Solar wind speed increased to 555 km/s early
on 21 Oct. Nominal solar wind conditions returned by midday on 23
Oct. The geomagnetic field responded with quiet to active levels on
18-19 Oct, quiet to unsettled conditions on 20 Oct, and quiet levels
thereafter.
Forecast of Solar and Geomagnetic Activity
25 October - 20 November 2021
Solar activity is expected to be at very low to low levels with a
slight chance for M-class (R1-R2, Minor-Moderate) flares on 25 Oct -
03 Nov as Region 2887 transits across the visible disk. Very low
levels are expected from 04 Nov -15 Nov. Very low to low levels are
expected again on 16-20 Nov with the return of Region 2887.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at normal to moderate levels throughout the forecast
period.
Geomagnetic field activity is expected to reach unsettled levels on
27-30 Oct, 06-08 Nov, and 15-16 Nov and active levels on 06 Nov due
to CH HSS activity.
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