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 16 0957 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1128 from 2022 Aug 08 SOLAR ACTIVITY --------------- Solar flaring activity was low at the start of the week when most regions on disc where in decay or otherwise stable. There were 2 low-level C-class flares in the afternoon of August 7 after which the X-ray flux remained below C-level until August 11, when the newly emerging region NOAA 3077 as well as new flux emergence in existing NOAA active region 3076 caused some low C-class flares. Another newly emerging region (NOAA 3079) then was responsible for most of the activity on August 12-13 and produced many C-class flares, the strongest of which was a C6.8 flare peaking at 07:31UTC on August 13. A partial halo coronal mass ejection (CME) was observed in LASCO C2 from around 12:48 UTC on August 14, with an estimated velocity of around 650 km/s. The CME is related to an on disc filament eruption in the north-western quadrant and was associated to a long duration C2.4 flare, at 12:35 UT on August 14, with an associated observed type II radio emission. The bulk of the CME was directed to the south-west, but a possible impact at Earth was predicted for August 17. The greater than 10 MeV proton flux was at nominal levels throughout the week. The greater than 2 MeV electron flux first crossed the 1000 pfu threshold on the afternoon of August 9 and remained enhanced for the remainder of the week. The 24h electron fluence rose to moderate levels on August 9 and remained at moderate levels throughout the rest of the week. At the end of the week on August 14 a trans-equatorial negative polarity coronal hole started transiting the central meridian. GEOMAGNETIC ACTIVITY --------------------- During the week, the Earth was under the influence of the high-speed stream from positive polarity equatorial coronal holes. By late August 7, the solar wind speed rose to 600km/s and it remained at those levels for around 3 days. A very slow decline then set in and the speed reduced to just under 500km/s by the end of the week. On August 7 the magnitude of the interplanetary magnetic field reached a value of almost 15nT in the compression region. Bz was variable but mostly negative in the compression region and reaching to -13nT. The orientation of the magnetic field indicated a connection to a positive sector (field away from the Sun). Geomagnetic conditions reached storm levels with the onset of the high speed stream. Late on August 7, an isolated episode of moderate geomagnetic storming was recorded. Over the rest of the week a downward trend was observed, with quiet to unsettled conditions by the end of the week. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2022 Aug 08 072 087 113 /// B4.2 0 0 2022 Aug 09 080 066 109 /// B3.5 0 0 2022 Aug 10 064 067 108 /// B2.5 0 0 2022 Aug 11 081 076 115 /// B2.8 0 0 2022 Aug 12 /// 110 120 /// B3.2 0 0 2022 Aug 13 /// 122 124 /// B5.5 0 0 2022 Aug 14 /// 119 126 /// B4.3 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.