SIDC Weekly Bulletin

Issued: 2020 Jun 29 1344 UTC
Product: documentation at www.sidc.be/products/bul
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SIDC Weekly bulletin on Solar and Geomagnetic activity #
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WEEK 1017 from 2020 Jun 22
SOLAR ACTIVITY
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Solar activity was at very low levels. There were two northern (SC24 and SC25 polarity) and one southern (SC25 polarity) active regions on the solar disk, all of which have decayed. The two northern had an alpha magnetic field configuration and where reported by the Catania observatory. The 10.7cm solar radio flux ranged mostly between 67 and 69 sfu. A negative polarity equatorial coronal hole (CH) transited the solar disk and crossed central meridian on June23rd, as well as one small, weak extension of the southern polar CH. The greater than 10 MeV proton flux was at background values. The greater than 2 MeV electron flux was at nominal to low values. Two filament eruptions with no associated events took place. A narrow coronal mass ejection (CME) was observed on June 2st, with a possible source on solar North West.
GEOMAGNETIC ACTIVITY
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Solar wind speed was slow to Moderate, with a small enhancement lasting June 27-28th. Solar wind speed ranged between 280 and 430 km/s, with Bz varying between -8 and +9 nT. The direction of the interplanetary magnetic field was on the negative sector, with an exception of June 24-26th when it was directed away from the Sun. Geomagnetic activity was at quiet to unsettled levels, with with an isolated active period.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2020 Jun 22 000 000 068 003 //// 0 0
2020 Jun 23 000 000 067 004 //// 0 0
2020 Jun 24 000 000 067 005 //// 0 0
2020 Jun 25 011 000 069 005 //// 0 0
2020 Jun 26 011 005 068 009 //// 0 0
2020 Jun 27 /// 003 069 010 //// 0 0
2020 Jun 28 /// 000 069 004 //// 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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