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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2021 Jun 06 1231 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10cm flux	Ap
06 Jun 2021	075	005
07 Jun 2021	076	004
08 Jun 2021	076	020

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-AR 2827) remained stable. The bipolar sunspot region (Catania sunspot group 2, NOAA-AR 2829) continued to grow but did not produce any significant flare. A new bipolar sunspot region (McIntosh’s class: Bxi) emerged in the south-west quadrant at the same location as NOAA-AR 2828 (which fully decayed on June 2); it did not show any significant flaring activity. The solar activity is expected to remain quiet for the next 24 hours with a small probability to produce C-class flare.

No Earth directed Coronal Mass Ejection (CME) has been detected in the available coronagraph imagery. A solar dimming was observed on June 05, between 18:57 UTC and 20:15 UTC, near the bipolar sunspot region (Catania sunspot group 2, NOAA-AR 2829) located near longitude -32 degrees and latitude -32 degrees. The associated coronal mass ejection was observed by SOHO/LASCO at 20:40 UTC. No direct-Earth component was identified

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.

The solar wind parameters (as observed by ACE and DSCOVR) showed an ambient background and slow solar wind speed regime. The solar wind speed ranged between 304 km/s and 340 km/s. The interplanetary magnetic field magnitude was below 7 nT, and Bz components varied between -5.6 nT and 4.0 nT. An equatorial coronal hole in the south hemisphere with positive magnetic polarity has reached the central meridian on June 04. The high-speed stream associated with this equatorial coronal hole may enhance the solar wind condition in about two days from now.

The geomagnetic conditions were mostly quiet over the past 24 hours (NOAA- Kp: 0-2, and local K-Dourbes: 0-3). Few short periods of unsettled condition were observed by the local K-Dourbes in response to a prolonged period of southward directed Bz component. The geomagnetic conditions are expected to remain mostly quiet for the next 24-hour period.

Today's estimated international sunspot number (ISN): 037, based on 18 stations.

Solar indices for 05 Jun 2021

Wolf number Catania	///
10cm solar flux	074
AK Chambon La Forêt	013
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	038 - Based on 16 stations

Noticeable events summary

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

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