Viewing archive of Thursday, 21 February 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Feb 21 1230 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
21 Feb 2019	071	014
22 Feb 2019	070	012
23 Feb 2019	070	006

Bulletin

Solar activity was at very low levels. The LASCO/C2 coronagraphic images now clearly indicate that the coronal mass ejection (CME) associated with yesterday's (20 February) filament eruption had no earth-directed component. A new eruption/restructuring of the filament, located near N10W12, started around 08:00 UT and was still in progress. The greater than 10 MeV proton flux was at nominal values.

Solar activity is expected to remain at very low levels.

Around 14UT, the solar wind speed started a gradual increase from 300 km/s to its current values near 450 km/s (DSCOVR) in response to the arrival of the co-rotating interaction region (CIR) and wind stream associated with the positive polarity coronal hole (CH). Bz oscillated between -8 and +10 nT. The interplanetary magnetic field was directed away from the Sun (positive sector) for the second half of the period. Geomagnetic activity was at quiet to unsettled levels, with Kp recording an isolated active period during the 06-09UT interval.

Mostly quiet to unsettled geomagnetic conditions are expected in response to the wind stream from the positive polarity CH, with an isolated active episode remaining possible.

Today's estimated international sunspot number (ISN): 000, based on 14 stations.

Solar indices for 20 Feb 2019

Wolf number Catania	015
10cm solar flux	071
AK Chambon La Forêt	008
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	000 - Based on 25 stations

Noticeable events summary

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

All times in UTC

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