Viewing archive of Saturday, 8 May 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2021 May 08 1231 UTC

SIDC Forecast

Valid from 1230 UTC, 08 May 2021 until 10 May 2021
Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

10cm fluxAp
08 May 2021076004
09 May 2021077005
10 May 2021076005

Bulletin

Solar activity reached moderate levels over the past 24 hours. The newly numbered NOAA AR 2822 (Catania sunspot group 93, mag. configuration Beta) produced an M3.9 flare, which peaked at 19:04 UT May 07. This is the only active region on the solar disk. Solar activity is expected to be generally low over the next 24 hours, with a chance of C-class flares and a very low probability of another M-class flare.

A Coronal Mass Ejections (CMEs) associated with the M3.9 flare, which was observed by STEREO-A/COR2 from 19:53 UT with a speed of around 600 km/s, is not initially considered to be Earth directed. A full analysis will be made when LASCO data becomes available. No other Earth CMEs have been detected in the available coronagraphic imagery.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux remained below the 1000 pfu alert threshold and is expected to remain below this level during the next 24 hours. The 24h electron fluence was at nominal levels and is expected to remain so.

The Earth is currently under the influence of the slow solar wind. The solar wind speed ranged between 290 to 340 km/s over the past 24 hours. The Bz component fluctuated between -4 and +6 nT. The interplanetary magnetic field phi angle was predominantly in the positive sector (directed away from the Sun). The solar wind conditions are expected to continue to reflect a slow solar wind regime for the next 24 hours. Slight enhancements in the solar wind speed are possible from May 09 due to the influence of a series of small negative polarity coronal holes.

Geomagnetic conditions were quiet (NOAA Kp and local K Dourbes 1-2) over the past 24 hours. Geomagnetic conditions are expected to be quiet to unsettled over the next 24 hours.

Today's estimated international sunspot number (ISN): 014, based on 12 stations.

Solar indices for 07 May 2021

Wolf number Catania013
10cm solar flux075
AK Chambon La Forêt006
AK Wingst004
Estimated Ap003
Estimated international sunspot number012 - Based on 25 stations

Noticeable events summary

07 1843 1904 1919 ////// M3.9 N 94 ///2822 I/3 8
DayBeginMaxEndLocStrengthOP10cmCatania/NOAARadio burst types

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

All times in UTC

<< Go to daily overview page

Latest news

Support SpaceWeatherLive.com!

A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!

Donate SpaceWeatherLive Pro
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2025/03/28X1.1
Last M-flare2025/04/01M2.4
Last geomagnetic storm2025/03/27Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
February 2025154.6 +17.6
April 2025147 -7.6
Last 30 days128.8 -21.8

This day in history*

Solar flares
12001X28.5
22001X2.01
32001X1.59
42014M9.35
52017M8.22
DstG
11960-272G3
21973-173G3
32001-101G1
41976-101G1
51994-96G3
*since 1994

Social networks