Viewing archive of Tuesday, 21 November 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Nov 21 1308 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 Nov 2017	074	032
22 Nov 2017	075	015
23 Nov 2017	074	011

Bulletin

Over the past 24 hours solar activity has been quiet. No significant flares have been recorded. All Active Regions (AR) have shown low levels of activity. No Earth directed Coronal Mass Ejections (CMEs) have been detected. The greater than 10MeV proton flux remained at background levels over the past 24 hours. Solar activity is expected to remain low over the next 24 hours with a low probability of C-class flares.

The solar wind speed been increasing from 300 and 600 km/s over the past 24 hours. The total magnetic field strength has fluctuated between 4 nT and 14 nT. The Bz component has fluctuated between positive and negative, fluctuating between -13 and +14 nT. Geomagnetic conditions ranged between Kp index 1-4 (NOAA) and local K index 1-4 (Dourbes) over the past 24 hours. A positive polar coronal hole is currently positioned in the Western hemisphere of the Sun and the resulting high-speed stream (HSS) has enhanced solar wind speeds and as a consequence increased geo-activity levels. Geomagnetic conditions are expected to remain unsettled throughout the day, but should begin to return to quiet conditions at the end of the day.

Today's estimated international sunspot number (ISN): 000, based on 12 stations.

Solar indices for 20 Nov 2017

Wolf number Catania	012
10cm solar flux	074
AK Chambon La Forêt	026
AK Wingst	007
Estimated Ap	007
Estimated international sunspot number	000 - Based on 15 stations

Noticeable events summary

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

All times in UTC

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