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: 2024 Apr 15 1213 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1215 from 2024 Apr 08 Solar Active Regions (ARs) and flares --------------- Solar flaring activity was low between April 8th-11th, with multiple C-class flares. Solar flaring activity reached moderate levels towards the end of the week, with three M-class flares. The strongest flare was an M5.4 from beyond the east solar limb, peaking at 17:06 UTC on April 11th. There was a total of 11 numbered active regions observed on the visible solar disk over the week. The most complex one was NOAA AR 3634, which evolved from beta to beta-gamma and back to beta. Coronal mass ejections --------------------- A faint Coronal Mass Ejection (CME) from the south-east was observed in SOHO/LASCO-C2 around 06:30 UTC on April 11th, likely associated with a filament eruption near the central meridian. A faint partial halo coronal mass ejection (CME) was observed in SOHO/LASCO-C2 and SOHO/LASCO-C3 starting from 02:30 UTC on April 12th. It was probably associated with the filament eruption observed in SDO/AIA 304 data at 01:10 UTC on April 12th. A faint Coronal Mass Ejection (CME) from the north was observed in SOHO/LASCO-C2 around 18:30 UTC on April 13th. It was probably associated with a C5.5 flare from NOAA AR 3634. A CME from the north-west limb was observed in SOHO/LASCO-C2 and SOHO/LASCO-C3 starting from 03:50 UTC on April 14th. It is possibly related to a prominence eruption on the west limb. Coronal Holes --------------------- Two small coronal holes have crossed the central meridian during the past week. The first one was a negative polarity, equatorial, south coronal hole that crossed the central meridian on April 9th. The second one was a positive polarity, mid-latitude, north coronal hole that crossed the central meridian on April 10th. Proton flux levels --------------------- The greater than 10 MeV GOES proton flux was below the 10 pfu threshold over the past week. Electron fluxes at GEO --------------------- Over the past week, the greater than 2 MeV electron flux remained below the 1000 pfu threshold as measured by GOES 16. The greater than 2 MeV electron flux measured by the GOES-18 satellite reached the threshold between 17:50 UTC and 23:30 UTC on April 7th. The 24-hour electron fluence was at nominal levels throughout the week. Solar wind --------------------- Over the past week, slow solar wind conditions were observed with speed values between 300 km/s and 510 km/s. The interplanetary magnetic field varied between 5 nT and 8 nT. The Bz component varied between -7 nT and 7 nT. The interplanetary magnetic field phi angle was predominantly in the positive sector. Geomagnetism --------------------- Geomagnetic conditions locally and globally were at quiet to unsettled levels (NOAA Kp and K BEL from 0 to 3). --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2024 Apr 08 110 073 125 006 B3.4 0 0 2024 Apr 09 072 058 124 010 B3.8 0 0 2024 Apr 10 069 055 131 009 B6.1 0 0 2024 Apr 11 096 089 144 006 B9.3 1 0 2024 Apr 12 084 080 152 005 C1.5 0 0 2024 Apr 13 /// 120 161 006 C1.2 1 0 2024 Apr 14 /// 139 178 006 C1.6 1 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 11 1652 1706 1711 ////// M5.4 /////// III/2IV/1 13 0458 0502 0506 S10E80 M2.4 SF ///3637 III/2 14 0224 0232 0236 S11E67 M4.3 1F ///3637 III/3 #--------------------------------------------------------------------# # 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.