SIDC Weekly Bulletin

:Issued: 2020 May 25 1057 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 1012 from 2020 May 18
SOLAR ACTIVITY
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Solar activity was at very low levels. The Sun was spotless all week. The
10.7cm solar radio flux ranged mostly between 69 and 71 sfu. From the two
small active regions that rotated over the east limb on 17 May, the
northern continued crossing the solar disk while the southern decayed. They
remained spotless and were the sources of only some minor A-class flaring.
Some small negative polarity equatorial coronal holes (CHs) transited the
solar disk, as well as two weak extensions of the southern polar CH. The
greater than 10 MeV proton flux was at nominal values. The greater than 2
MeV electron flux was at nominal to low values. No filament eruptions took
place. No earth-directed coronal mass ejections (CMEs) were observed
throughout the week.
GEOMAGNETIC ACTIVITY
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Solar wind was mostly at the slow regime, with a small enhancement lasting
May 18-21. Solar wind speed ranged between 285 and 420 km/s, with Bz mostly
varying between -6 and +6 nT. The direction of the interplanetary magnetic
field was variable throughout the week, reflecting a patchy Sun and the
fact that the helipspheric current sheet was close to the equator.
Geomagnetic activity was at quiet to unsettled levels.
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DAILY INDICES
DATE           RC   EISN  10CM   Ak   BKG    M   X
2020 May 18   ///    000   070   006   A1.3   0   0   
2020 May 19   ///    000   069   008   A1.1   0   0   
2020 May 20   ///    000   070   003   ////   0   0   
2020 May 21   ///    000   070   006   ////   0   0   
2020 May 22   ///    000   071   008   ////   0   0   
2020 May 23   ///    000   069   005   ////   0   0   
2020 May 24   ///    000   069   007   ////   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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