Viewing archive of Thursday, 8 June 2023

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2023 Jun 08 1231 UTC

SIDC Forecast

Solar flares

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
08 Jun 2023	170	011
09 Jun 2023	168	015
10 Jun 2023	168	015

Solar Active Regions and flaring

The solar flaring activity was at low levels, with several C-class flares being detected in the last 24 hours. The largest flare was a C9.2 flare, peaking at 18:35 UTC on June 07, associated with NOAA AR 3327 (beta-gamma-delta class). This region remains the largest and most complex active region on the disk and was the main driver of the flaring activity observed over the past 24 hours. NOAA AR 3323 (beta-gamma class) is the second most complex active region on the visible solar. This region produced low level C-class flaring, as did NOAA AR 3324, 3325, 3329 (beta class), 3331 (alpha class). Other regions on the disc have simple configuration of their photospheric magnetic field (alpha and beta) and did not show any significant flaring activity. The solar flaring activity is expected to be at low to moderate levels over the next 24 hours with a small chance for isolated X-class flare.

Coronal mass ejections

In the past 24 hours, several coronal mass ejections (CME) and flows were observed in the available SOHO/LASCO coronagraph imagery and automatically detected by the Cactus tool over. In particular, the CME was observed in SOHO/LASCO-C2 at around 07:05 UTC on June 07, likely related to the C7.2 flare from NOAA AR 3327 and filament eruption with an accompanying on disc dimming and a type II radio burst detected around 06:37 UTC. The CME appears narrow and is not expected to arrive to Earth. No other Earth-directed CMEs have been detected in the available coronagraph imagery.

Coronal holes

A positive polarity coronal hole located in the northern hemisphere (N30) has crossed the central meridian today. Additionally, there is a positive polarity coronal hole in the southern hemisphere (S40) that is currently crossing the central meridian. Although no significant high-speed stream is expected, there might be some enhancements in the solar wind near Earth on June 9th - June 10th associated with the coronal hole in the northern hemisphere.

Solar wind

At the beginning of the period, the solar wind parameters were reflecting slow solar wind conditions. The solar wind speed was approximately 330 km/s; the total interplanetary magnetic field was weak, around 5 nT. A small shock-like structure was observed in the solar wind at 22:23 UTC on June 07. At this time the speed increased from 330 to 380 km/s and the magnetic field reached the values up to 10 nT. The southward interplanetary magnetic component, Bz, ranged between -6 nT and 6 nT. This may be related to the CME from June 04. The interplanetary magnetic field was predominantly in the positive sector (directed away from the Sun). The solar wind conditions are expected to continue to be elevated on June 08 due to the ICME passage. On June 09-10, the solar wind from a coronal hole with positive polarity in the northern hemisphere may arrive to the Earth, but since the coronal hole is located at high latitudes, the corresponding high speed stream may miss the Earth.

Geomagnetism

During last 24 hours the geomagnetic conditions were at quiet to unsettled levels (NOAA KP 1-3 and K-Bel 1-3). Geomagnetic conditions are expected at quiet to unsettled levels during next days with a chance for active periods due to the ICME passage and possible HSS arrival on June 09-10.

Proton flux levels

Over the past 24 hours the greater than 10 MeV GOES proton flux was at nominal levels and is expected to remain so over the next days.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux was below the 1000 pfu threshold and is expected to remain below this threshold for the next days.The 24h electron fluence was at normal level. The electron fluence is expected to be at normal levels in the next days.

Today's estimated international sunspot number (ISN): 174, based on 17 stations.

Solar indices for 07 Jun 2023

Wolf number Catania	///
10cm solar flux	167
AK Chambon La Forêt	009
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	193 - Based on 22 stations

Noticeable events summary

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

All times in UTC

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