Viewing archive of Thursday, 4 February 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2021 Feb 04 1230 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
04 Feb 2021	074	007
05 Feb 2021	074	007
06 Feb 2021	074	007

Bulletin

Solar activity was at low levels over the past 24 hours. The only active region on the visible Sun, NOAA AR 2801 has reduced its size, number of sunspots and simplified its magnetic configuration from beta to alpha. Solar activity is expected to remain at low levels.

No Earth directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraphic imagery.

An equatorial positive polarity coronal hole traversed central meridian yesterday, its associated high speed solar wind is expected to arrive to the Earth on 7 February.

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 threshold during the past 24 hours. The electron flux is expected to go above this alert level for the next period. The 24h electron fluence was mostly at normal levels, it is expected to increase in the next 24 h.

Over the past 24 hours, the solar wind speed ranged between 475 and 550 km/s. The total magnetic field strength fluctuated between 4 and 8 nT. Bz had a minimum value of -6 nT. The interplanetary magnetic field was directed towards the Sun (negative polarity). The Earth is under the influence of the high-speed solar wind stream associated with the elongated negative polarity coronal hole that began to cross the central meridian on Jan 28. The solar wind speed is expected to decrease over the next 24 hours.

Geomagnetic conditions reached active levels (NOAA Kp recorded values between 1-4, local k Dourbes between 1-4). Geomagnetic conditions are expected to be mostly quiet to unsettled, with possible active periods, in the next 24 hours.

Today's estimated international sunspot number (ISN): 000, based on 15 stations.

Solar indices for 03 Feb 2021

Wolf number Catania	022
10cm solar flux	074
AK Chambon La Forêt	021
AK Wingst	///
Estimated Ap	013
Estimated international sunspot number	006 - Based on 18 stations

Noticeable events summary

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

All times in UTC

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