SIDC Weekly Bulletin

:Issued: 2020 Oct 26 1452 UTC
:Product: documentation at http://www.sidc.be/products/bul
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# SIDC Weekly bulletin on Solar and Geomagnetic activity             #
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WEEK 1034 from 2020 Oct 19
SOLAR ACTIVITY
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Solar activity was at very low levels. The Sun had 2 southern (AR12776 and
AR12777) and 1 northern active region (Catania group 46) that crossed the
disk. A number of A and B class flares were registered. A B1.3 flare from
AR12776 was associated with an EUV wave, but was unclear whether it
impacted Earth. There was one plage in the NE quadrant, which was never
formed to a region before it faded to the background and that was the
origin or a filament eruption. The 10.7cm solar radio flux ranged mostly
between 72 and 76 sfu. A positive polarity equatorial coronal hole crossed
central meridian on Oct 22 while two extensions of the northern coronal
hole crossed central meridian on Oct 18th and 19th.

No Earth directed Coronal Mass Ejections (CME's) have been observed in
coronagraph data.

The greater than 10 MeV proton flux was at background values. The greater
than 2 MeV electron flux was at nominal levels values at the start of the
week, increasing to moderate on Oct 23rd and rising to high levels from Oct
25th onwards, crossing 10^3 pfu event threshold.
GEOMAGNETIC ACTIVITY
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The solar wind was mostly at the slow regime at the beginning of the week,
when only a small shock was registered Oct 19th at about12:00UT. Later in
the week the high speed stream associated to the extension of the northern
coronal hole increased the solar wind parameters, with its speed reaching
values of 595 km/s (DSCOVR). Solar wind speed ranged between 300 and 595
km/s, with Bz varying between -11 and +13 nT. The direction of the
interplanetary magnetic field varied. Geomagnetic activity was at quiet to
unsettled levels for the majority of the week, with a series of active
time-periods from Oct 24th onwards.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2020 Oct 19   018    015   075   008   A3.6   0   0   
2020 Oct 20   016    012   075   006   A2.8   0   0   
2020 Oct 21   012    010   074   009   A2.0   0   0   
2020 Oct 22   012    010   075   008   A2.1   0   0   
2020 Oct 23   026    018   072   016   A2.0   0   0   
2020 Oct 24   ///    016   072   018   A1.7   0   0   
2020 Oct 25   ///    017   074   020   A1.7   0   0   
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# RC   : Sunspot index (Wolf Number) from Catania Observatory (Italy)
# EISN : Estimated International Sunspot Number
# 10cm : 10.7 cm  radioflux (DRAO, Canada)
# Ak   : Ak Index Wingst (Germany)
# BKG  : Background GOES X-ray level (NOAA, USA)
# M,X  : Number of X-ray flares in M and X class, see below (NOAA, USA)
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NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX  END  LOC    XRAY OP  10CM Catania/NOAA RADIO_BURST_TYPES 
NONE
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