Viewing archive of Thursday, 21 January 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2021 Jan 21 1255 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
21 Jan 2021	079	004
22 Jan 2021	078	009
23 Jan 2021	078	006

Bulletin

There are presently two numbered sunspot groups observed on the visible side of the Sun, Catania sunspot groups 66 and 67 (NOAA ARs 2797 and 2798). During last 24 hours 10 B-class flares and 1 C-class flare were reported, all originating from the NOAA AR 2798. The C 1.4 flare which peaked at 12:53 UT on January 20 was associated with a slow CME. We expect B-class flares and occasional C-class flares in the coming hours. The filament eruption in the south-west quadrant of the Sun was associated with a rather narrow CME which is unlikely to arrive to Earth. During last 24 hours the proton flux levels remained at background values.

During last 48 hours the solar wind speed fluctuates around 340 km/s. The interplanetary magnetic field magnitude is about 6 nT. Small but well defined, equatorial coronal hole of negative polarity (situated at the same latitudes but preceding the NOAA ARs 2797 and 2798) has reached the central meridian this morning. The associated fast solar wind can be expected at Earth late on January 24. The geomagnetic conditions are presently quiet and we expect quiet to possibly unsettled geomagnetic conditions in the coming hours.

Today's estimated international sunspot number (ISN): 025, based on 15 stations.

Solar indices for 20 Jan 2021

Wolf number Catania	027
10cm solar flux	///
AK Chambon La Forêt	009
AK Wingst	///
Estimated Ap	007
Estimated international sunspot number	018 - 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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