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 May 18 2249 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1115 from 2022 May 09 SOLAR ACTIVITY --------------- Over the past week the solar activity was at low to high levels. There were eleven numbered active regions on the visible solar disc and two unnumbered regions which rotated over the north-east limb at the end of the week. The beginning of the week started with NOAA AR 3004 (beta-delta) and a few other simple regions approaching the west limb and high C-class flaring activity from NOAA AR 3007 (beta). The flaring activity reached high levels on May 10th with an X1.5 class flare (start time 13:50 UTC, peak time 13:55 UTC, end time 13:59 UTC) from active region NOAA AR 3006 in the south-west quadrant, which had grown in size, sunspot number and complexity and was classified as magnetic type beta-gamma-delta. The solar activity was at moderate levels on May 11th with an M1.5-class flare, peak time 16:49 UTC, produced by NOAA AR 3007 near the central meridian, which developed into beta-gamma-delta, while NOAA AR 3006 decreased its complexity. Further low M-class flaring was observed from behind the west limb, most probably from NOAA AR 3004 and high C-class flaring was produced from the east limb. The solar flaring activity remained at moderate levels on May 12th with a single M1.3-class flare, peak time 20:19 UTC, from behind the north-east limb. NOAA AR 3007 (beta-gamma-delta) further increased its sunspots and approached the central meridian. Few other simple active regions developed on the visible disk and NOAA AR 3010 (beta) rotated from the east limb, producing low levels of flaring activity. Flaring activity was at low levels on May 13th and returned to moderate levels on May 14th with background C-class flaring and an isolated M2.2-flare (peak time 00:09 UTC on May 15th) from the north-east limb. The solar disc was streaked with filaments throughout the entire week and has a few filament eruptions, none of which produced an Earth-directed CME. Several partial halo CMEs were detected in the LASCO C2 coronagraph data, most of which were back-sided. An on-disc partial halo CME related to the X1.5-class and earlier C4.7-class flaring was first observed by LASCO C2 at 14:24 UTC on May 10th. A minor flank from this CME was estimated to possibly affect Earth during the night of May 13th or early on May 14th. No other Earth-directed CMEs were detected in the available coronagraph imagery throughout the week. A large patchy positive polarity coronal crossed the central meridian in the UTC afternoon on May 12th and the related high speed stream (HSS) was expected to reach Earth early on May 16th. The greater than 10 MeV proton flux was below radiation storm thresholds throughout the entire week. The 10 MeV proton flux was elevated on May 11th following the M-class flaring produced by NOAA 3007 and NOAA 3004 and related coronal eruptions. The 10 MeV proton flux values returned to background values on May 13th and remained at nominal levels thereafter. The greater than 2 MeV electron flux briefly crossed the 1000 pfu threshold in the UTC afternoon of May 08th. It returned to background values after a few hours and remained so throughout the remaining of the week. The electron fluence was at nominal levels throughout the entire week. GEOMAGNETIC ACTIVITY --------------------- The solar wind parameters as registered by ACE and DSCOVR were at background slow solar wind levels throughout most of the week. On May 14th the solar wind parameters registered the early arrival of a CIR and a HSS from the positive polarity coronal, which crossed the central meridian on May 12th. The magnitude of the interplanetary magnetic field increased to 20.7 nT. The Bz component reached a minimum of 10.2 nT. On May 15th the solar wind speed approached 580 km/s. The expected flank arrival from the CME related to the X1.5- and C4.7-class flaring on May 10th did not arrive to Earth and was not detected in the solar wind data throughout the week. The geomagnetic conditions were locally quiet to unsettled throughout the entire week and globally quiet to unsettled with two isolated active periods in the early UTC morning on May 15th while the Earth was influenced by the CIR and the early HSS arrival. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2022 May 09 /// 069 117 008 B5.8 0 0 2022 May 10 071 055 116 004 B7.6 0 1 2022 May 11 098 081 133 007 C1.1 3 0 2022 May 12 139 113 133 010 C1.0 1 0 2022 May 13 173 122 150 008 C1.2 0 0 2022 May 14 /// 129 153 008 C1.1 1 0 2022 May 15 /// 144 154 014 C1.0 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 10 1350 1355 1359 S30W04 X1.5 1B 01/3006 II/3 11 1635 1649 1658 S24E41 M1.6 1N 02/3007 11 1813 1858 1927 ////// M2.6 82 /////// II/2IV/2 11 1927 1931 1935 S25E37 M2.2 SF /////// 12 2004 2019 2027 ////// M1.3 /////// 14 2358 0008 0017 ////// M2.2 /////// #--------------------------------------------------------------------# # 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.