SIDC Weekly Bulletin

Issued: 2020 Jul 13 1253 UTC
Product: documentation at www.sidc.be/products/bul
——————————————————————
SIDC Weekly bulletin on Solar and Geomagnetic activity #
——————————————————————
WEEK 1019 from 2020 Jul 06
SOLAR ACTIVITY
—————
Solar activity was at very low levels. The Sun was spotless most of the week, with some small spots visible on 6, 7 and 10 July. NOAA 2766 was the source of two A2 flares on 11 July. The 10.7cm solar radio flux ranged between 67 and 70 sfu. Filament eruptions took place on 5 July (southeast quadrant), and on 8 and 9 July resp. in the southwest quadrant and near the northwest limb. The slow and faint coronal mass ejection (CME) associated with the eruption in the southwest quadrant may have an earth-directed component. No other earth-directed CMEs were observed throughout the week. A small positive polarity equatorial coronal hole (CHs) and a patchy negative polarity CH transited the central meridian on 8-9 July. The greater than 10 MeV proton flux was at nominal values.
GEOMAGNETIC ACTIVITY
———————
On 6 and 7 July, the earth environment was still under the influence of a wind stream associated with a positive polarity coronal hole (CH), after which the solar wind parameters returned to nominal levels. Solar wind speed decreased from values near 510 km/s early in the week to values between mostly 300 to 350 km/s from 9 July onwards. Bz varied between -6 and +5 nT. The direction of the interplanetary magnetic field was in a predominantly positive sector (away from the Sun). Geomagnetic activity was at quiet to unsettled levels. The greater than 2 MeV electron flux was at nominal to low values.
—————————————————————————
DAILY INDICES
DATE RC EISN 10CM Ak BKG M X
2020 Jul 06 011 006 069 008 //// 0 0
2020 Jul 07 025 010 068 004 //// 0 0
2020 Jul 08 000 000 067 003 //// 0 0
2020 Jul 09 000 000 069 004 //// 0 0
2020 Jul 10 /// 003 069 002 //// 0 0
2020 Jul 11 /// 000 069 003 //// 0 0
2020 Jul 12 /// 000 068 003 //// 0 0
—————————————————————————
# 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)
—————————————————————————

NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX END LOC XRAY OP 10CM Catania/NOAA RADIO_BURST_TYPES
NONE

——————————————————————
– #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
——————————————————————