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 Mar 18 1309 UTC :Product: documentation at http://www.sidc.be/products/bul #--------------------------------------------------------------------# # SIDC Weekly bulletin on Solar and Geomagnetic activity # #--------------------------------------------------------------------# WEEK 1211 from 2024 Mar 11 Solar Active Regions (ARs) and flares --------------- There were 15 active regions visible throughout the week. Only NOAA AR 3599 evolved into a complex magnetic field configuration (beta-gamma-delta) and created most of the flaring during the week. The other active regions had simple magnetic field configuration (alpha or beta). By the end of the week, with NOAA AR 3599 out of view, the flaring activity shifted to NOAA AR 3612 and to two active regions rotating into view from the east limb (one unnumbered and NOAA AR 3614). Coronal mass ejections --------------------- An M7.4 flare from NOAA AR 3599 on 10 March was related to dimmings and an EUV wave and CME directed towards the west. The CME was not very wide (apparent angular width of about 70 degrees) and speed close to 500 km/s. On 13 March, a partial halo CME with angular width around 150 degrees was first seen by LASCO C2 at 08:57 UT. There are no signatures of an eruption on the visible solar disk, so this CME was deemed backsided. On 14 March we observed a partial halo CME, seen by LASCO C2 at 05:08 UTC, with an angular width of about 140 degrees, directed towards the east. This eruption occurred close to the limb but was mostly backsided On 15 March, one more partial halo CME was observed by LASCO C2 at 02:10 with an angular width of 150 degrees and directed towards the west (related to flaring activity from NOAA AR 3599 over the west limb). This eruption also occurred close to the limb and was mostly backsided. On 17 March, a partial halo CME (angular width about 180 degrees) was observed, directed towards the south, first seen at 03:24 UTC by LASCO C2. This CME originated from a filament eruption in the southern hemisphere. Coronal Holes --------------------- An equatorial (positive polarity) coronal hole crossed the central meridian on 10 March. Proton flux levels --------------------- The partial halo CME from 15 March was associated with an increase in the 10 MeV proton flux at Earth; it crossed the 10 pfu threshold and remained elevated during 16 March. It is still slowly returning to background levels at the moment of writing (but below the threshold). The rest of the week the proton flux was at background levels. Electron fluxes at GEO --------------------- The greater than 2 MeV electron flux was below the threshold level, except on 10-11 March when it was slightly above it. The electron fluence was at normal levels throughout the week. Solar wind --------------------- The solar wind was slow the entire week, with speeds below 500 km/s and interplanetary magnetic field below 10 nT. Geomagnetism --------------------- The geomagnetic conditions were quiet to unsettled the whole week, both locally and globally, except for a brief interval on 15 March that reached active levels. --------------------------------------------------------------------------- DAILY INDICES DATE RC EISN 10CM Ak BKG M X 2024 Mar 11 108 074 127 004 B4.4 0 0 2024 Mar 12 116 082 131 006 B4.8 0 0 2024 Mar 13 093 081 128 009 B4.7 0 0 2024 Mar 14 091 071 127 009 B8.0 1 0 2024 Mar 15 052 051 129 008 C1.0 0 0 2024 Mar 16 /// 058 144 002 C1.0 2 0 2024 Mar 17 /// 084 151 001 C1.6 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 14 0552 0604 0611 S11W82 M1.0 SF 99/3599 III/1VI/1 16 1622 1635 1644 ////// M3.5 /////// 16 2127 2155 2211 ////// M1.1 /////// #--------------------------------------------------------------------# # 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.