SIDC Weekly Bulletin
Review of past solar and geomagnetic activity.Source | SIDC (RWC-Belgium) |
Frequency | Weekly |
Format | Plain text |
Mail header | SIDC Weekly Bulletin |
SIDC code | bul |
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:Issued: 2021 Jan 18 1653 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1046 from 2021 Jan 11 SOLAR ACTIVITY --------------- The solar activity was at very low levels over the entire week. The visible solar disk was spotless until Jan 15th when a new faint sunspot group emerged, which was later numbered and classified as NOAA AR 2796 (beta). This active region remained quiet for the rest of the week. The flaring activity throughout the entire week was very low with only a few isolated B-class flares at the end of the week. The X-ray flux remained below C-class flare level for the whole week. A slow back-sided CME was ejected from the east limb around 22 UTC on Jan 16th. It was probably related to low-level flaring activity from NOAA AR 2795. No Earth-directed Coronal Mass Ejections (CMEs) were observed in the available chronograph imagery for the entire week. The greater than 10 MeV proton flux remained at background levels over the entire week. The greater than 2 MeV electron flux was under the 1000 pfu threshold and the electron fluence was at nominal levels. GEOMAGNETIC ACTIVITY --------------------- The solar wind conditions (based on DSCOVR and ACE data) were elevated at the beginning of the week under the combined influence of an ICME, related to the south-west CME ejected by the Sun on Jan 8th, and a CIR followed by a high speed stream (HSS) emanating from a positive polarity coronal hole. Due to the combined effect of the ICME and the CIR the maximum registered interplanetary magnetic field reached 20.2 nT on Jan 11th with a corresponding minimum of the north-south Bz component reaching -18.3 nT. The HSS related to the geo-effective positive polarity coronal hole was characterised with moderate speeds below 500km/s on Jan 11th and Jan 12th. On Jan 13th the solar wind conditions started to return back to nominal slow solar wind and remained at background levels throughout the rest of the week. The geomagnetic conditions were mostly quiet over the week. The arrival of the ICME and the CIR/HSS brought globally active conditions on Jan 11th and Jan 12th and locally three periods with minor geomagnetic storms (from 16 to 18 UTC on Jan 11th and from 02 - 03 UTC on Jan 12th). On Jan 13th the geomagnetic conditions returned back to quiet and remained quiet throughout the rest of the week. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2021 Jan 11 000 000 073 /// //// 0 0 2021 Jan 12 000 000 073 /// //// 0 0 2021 Jan 13 000 000 073 /// //// 0 0 2021 Jan 14 000 004 074 /// A1.4 0 0 2021 Jan 15 /// 016 073 /// A1.4 0 0 2021 Jan 16 /// 013 078 /// A3.1 0 0 2021 Jan 17 /// 015 077 /// A4.1 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 #--------------------------------------------------------------------# # Solar Influences Data analysis Center - RWC Belgium # # Royal Observatory of Belgium # # # # Website http://www.sidc.be. # # E-mail sidc-support@oma.be # # To unsubscribe http://www.sidc.be/registration/unsub.php # # # # Legal notices: # # - Intellectual Property Rights: # # http://www.astro.oma.be/common/internet/en/data-policy-en.pdf # # - Liability Disclaimer: # # http://www.astro.oma.be/common/internet/en/disclaimer-en.pdf # # - Use and processing of your personal information: # # http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf # #--------------------------------------------------------------------#
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This report is sent once a week, typically on a monday.The weekly bulletin gives an overview of solar and geomagnetic activity of the past week and includes a noticeable solar events list.
Check the ISES code book for information on ISES codes.