XPost: rec.radio.amateur.space, rec.radio.shortwave, rec.radio.info

:Product: Weekly Highlights and Forecasts
:Issued: 2021 Aug 02 0415 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
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# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
26 July - 01 August 2021

Solar activity was very low under a mostly spotless disk. 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 779 pfu observed at
30/1600 UTC.

Geomagnetic field activity ranged from quiet to active levels. The
period began with nominal solar wind parameters on 26 Jul through
late on 27 Jul. At approximately 27/1830 UTC, total field began to
increase to a peak of 18 nT at 28/1038 UTC followed by an increase
in solar wind speed to near 545 km/s as a positive polarity coronal
hole high speed stream (CH HSS) became geoeffective. Solar wind
speed slowly diminished to nominal levels through 01 Aug. The
geomagnetic field responded with quiet to unsettled levels on 27 and
29 Jul and quiet to active levels on 28 Jul. The rest of the period
was at quiet levels.

Forecast of Solar and Geomagnetic Activity
02 August - 28 August 2021

Solar activity is expected to be at very low levels with a chance
for low levels on 05-18 Aug with the return of old Regions 2842
(N25, L=200) and 2845 (S15, L=195).

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 on 02-28 Aug.

Geomagnetic field activity is expected to reach unsettled levels on
05-06, 10-11, 16-18, 23-25 Aug and active levels on 10, 24 Aug due
to CH HSS activity.

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