Viewing archive of Monday, 26 July 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2021 Jul 26 1238 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
26 Jul 2021	080	006
27 Jul 2021	080	014
28 Jul 2021	080	012

Bulletin

The solar activity has been quiet over the past 24 hours, with the X-ray flux below C-level. Two sunspot groups are currently visible on the solar disc (Catania sunspot group 22 / NOAA AR-2846, and Catania sunspot group 23 / NOAA AR-2847). They have not produced any significant flare. The solar activity is expected to remain mostly low levels over the next 24 hours with possible C-class flare.

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.

The solar wind parameters (as observed by ACE and DSCOVR) show an ambient background and slow solar wind speed regime. The solar wind speed ranged from 301 km/s to 446 km/s. The interplanetary magnetic field magnitude was below 5.0 nT, and Bz components varied between -4.0 nT and 3.9 nT. The high-speed streams associated with the mid-latitude extension of the positive polarity northern polar Coronal Hole, reported crossing the central meridian on July 24th is expected to enhance the solar wind condition on July 27 and persist for several days.

The geomagnetic conditions were mostly quiet over the past 24 hours. The conditions are expected to remain mostly quiet as the Earth is expected to remain in slow solar wind speed regime for the next 24 hours. Then, the conditions are expected to be unsettled to active with the arrival of the high-speed streams associated with northern polar Coronal Hole in July 27-28.

Today's estimated international sunspot number (ISN): 032, based on 19 stations.

Solar indices for 25 Jul 2021

Wolf number Catania	///
10cm solar flux	082
AK Chambon La Forêt	007
AK Wingst	003
Estimated Ap	002
Estimated international sunspot number	031 - Based on 31 stations

Noticeable events summary

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

All times in UTC

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