SIDC Weekly Bulletin

Issued: 2020 Aug 17 0823 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 1024 from 2020 Aug 10
SOLAR ACTIVITY
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The solar activity was quiet over the past week. Few sunspots were observed, but with very low flaring activity. A C2.0-class flare was observed on August 15 at 06:47 UTC originated from the sunspots NOAA-AR 2770, which has then turned over the West limb.

No Coronal Mass Ejections with Earth-components were identified in the available coronagraphic imagery or on-disc over the last week. One West-side Coronal Mass Ejection associated with the C2.0-flare was triggered and a large coronal wave was observed in PROBA2/SWAP images.

The greater than 10 MeV proton flux was at nominal levels over the past week. The greater than 2 MeV electron flux reached High levels at the beginning of the week, then decreased at the end of the week and fluctuated from nominal to Moderate levels.
GEOMAGNETIC ACTIVITY
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The Earth was under the influence of the slow solar wind streams. The solar wind parameters (DSCOVR) was mostly at nominal values with the solar wind speed below 400 km/s. The total interplanetary magnetic field was slightly more enhanced and reached the values around 8.7 nT at the end of the week (probably due to some interaction with wind steams coming from polar coronal holes). The Bz magnetic field components fluctuated between -6.2 nT and +7.6 nT.

Geomagnetic conditions were quiet all over the past week.
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DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2020 Aug 10 /// 012 074 002 A2.5 0 0
2020 Aug 11 /// 012 074 004 A3.0 0 0
2020 Aug 12 /// 017 073 004 A2.4 0 0
2020 Aug 13 /// 012 072 006 A1.8 0 0
2020 Aug 14 /// 005 071 006 A1.3 0 0
2020 Aug 15 /// 000 071 003 //// 0 0
2020 Aug 16 /// 000 071 006 //// 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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