Viewing archive of Thursday, 3 June 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2021 Jun 03 1243 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
03 Jun 2021	077	013
04 Jun 2021	077	011
05 Jun 2021	077	007

Bulletin

The solar activity was quiet over the past 24 hours, with the GOES X-ray flux remaining below C-level. The bipolar sunspot group (Catania sunspot group 1, NOAA 2827) has continued to decay, a new sunspot region (NOAA 2829) that rotated over the East limb in the South hemisphere yesterday is a unipolar magnetic region not showing any significant activity. The solar activity is expected to remain mostly quiet.

No Earth directed Coronal Mass Ejection (CME) has been detected in the available coronagraph 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 was below the 1000 pfu threshold in the past 24 hours and is expected to remain so during the next 24 hours. The 24h electron fluence was at normal levels in the last 24 hours and is expected to stay at normal levels for the next 24 hours.

A solar wind shock was observed at 12:20 UT on June 02 in the solar wind parameters as registered by DSCOVR. The solar wind speed jumped from 289 km/s to 325 km/s and the interplanetary magnetic field magnitude jumped from 3 nT to 6 nT. This solar wind shock is associated with the expected glancing blow from the coronal mass ejection that was observed on May 28 close to the West limb. This solar wind shock was followed by some enhancements in the interplanetary magnetic field magnitude that reached 12.2 nT, on Jun 03 around 06:00 UTC. This is associated with a sector boundary crossing with the change of the phi angle that turned positive (i.e. the magnetic field lines extending away from the sun). The solar wind speed remained, however, slow for the whole 24-hour period around 300 km/s. The high-speed stream associated with the equatorial coronal hole (that reached the central meridian on May 31) may enhance the solar wind condition later today or tomorrow.

The geomagnetic conditions were unsettled to active over the past 24 hours (max K-Dourbes = 4, and max NOAA-Kp = 3) due to the solar wind shock observed at 12:20 UT on June 02, and the sector boundary crossing around at 06:00 UTC on June 03. The conditions may become more active with the arrival of the high-speed streams from the equatorial coronal hole (that reached the central meridian on May 31) later today or tomorrow.

Today's estimated international sunspot number (ISN): 029, based on 21 stations.

Solar indices for 02 Jun 2021

Wolf number Catania	///
10cm solar flux	076
AK Chambon La Forêt	012
AK Wingst	009
Estimated Ap	007
Estimated international sunspot number	029 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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