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: 2022 Aug 09 1402 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1127 from 2022 Aug 01 SOLAR ACTIVITY --------------- Over the past week the solar activity was at very to low levels with 11 C-class flares and no M- or higher class flaring. There were in total ten active regions on the visible solar disc, namely NOAA 6062 and NOAA 6068 - NOAA 3076, the majority of which were simple and inactive. The strongest registered activity throughout the week was a C9.3-class flare from behind the north-east limb with peak time 23:09 UTC on July 31st. The rest of the week registered unremarkable sporadic C-class flaring, mainly from NOAA AR 3068, which was the largest and most complex active region throughout the week, reaching magnetic type beta-gamma. Regardless of its increased complexity this sunspot group produced only a few low C-class flares. Multiple filament and a prominence eruptions were observed throughout the week, and three type II radio bursts were detected. Nevertheless none of these events resulted in an Earth-directed coronal mass ejection (CME). The greater than 10 MeV proton flux was at nominal levels throughout the entire week and the greater than 2 MeV electron flux only briefly crossed the 1000 pfu threshold in the UTC afternoon of July 31st and remained well under the threshold for the rest of the week. The electron fluence was at nominal levels throughout the entire week. GEOMAGNETIC ACTIVITY --------------------- The week started with slightly elevated solar wind velocity under the mild influence of a high speed stream (HSS) from a negative polarity coronal hole. These enhancements continued throughout Aug 4th with maximum solar wind speed up to 560 km/s. The solar wind conditions returned to mostly background levels on Aug 5th and Aug 6th until the arrival of another HSS from a positive polarity coronal hole with a sector boundary crossing around midnight UT on Aug 7th. The magnitude of the interplanetary magnetic field reached 15 nT with a minimum recorded Bz component of -13 nT in the afternoon of Aug 7th while the solar wind speed remained below 450 km/s by the end of the forecasting week. The geomagnetic conditions throughout the entire week were mostly quiet to unsettled. Some active periods were observed in the beginning and towards the end of the forecasting week due to the two high speed stream arrivals. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2022 Aug 01 020 028 095 011 B2.0 0 0 2022 Aug 02 040 036 098 012 B2.8 0 0 2022 Aug 03 042 039 100 012 B2.4 0 0 2022 Aug 04 051 048 109 /// B3.5 0 0 2022 Aug 05 081 077 114 /// B4.0 0 0 2022 Aug 06 /// 078 116 /// B4.5 0 0 2022 Aug 07 /// 091 116 /// B4.5 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 # #--------------------------------------------------------------------#
Details
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.