Viewing archive of Tuesday, 24 September 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Sep 24 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
24 Sep 2019	066	016
25 Sep 2019	066	011
26 Sep 2019	066	016

Bulletin

Solar X-ray flux remained below B class levels throughout the period. The Solar disk is spotless and X-ray flux is expected to remain at or below background levels.

There are currently no SoHO-LASCO coronagraph observations available, STEREO-A COR coronagraph and SDO-AIA EUV observations indicate no Earth- directed CMEs (Coronal Mass Ejection) were produced. Without LASCO data to corroborate the absence of a CME, these observations should be treated with caution, with the small possibility of an unobserved Earth directed CME having been produced.

Proton levels were at background values and are expected to remain so. The solar wind speed has fluctuated between 300 and 350 km/s over the past 24 hours. The total magnetic field strength has fluctuated between 3 and 7 nT. The Bz between -6 and 5 nT. Geomagnetic conditions ranged between Kp index 1-3 (NOAA) and local K index 0-2 (Dourbes).

Solar wind conditions are expected to be enhanced over the next 24 hours due to a high speed stream (HSS) from a recurrent equatorial coronal hole. The solar wind speed may reach speeds exceeding 500 km/s.

Geomagnetic conditions are expected to become unsettled throughout the day, with some active periods due to HSS solar wind enhancements.

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

Solar indices for 23 Sep 2019

Wolf number Catania	000
10cm solar flux	066
AK Chambon La Forêt	010
AK Wingst	004
Estimated Ap	002
Estimated international sunspot number	000 - Based on 23 stations

Noticeable events summary

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

All times in UTC

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