Viewing archive of Thursday, 26 September 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Sep 26 1230 UTC

SIDC Forecast

Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

	10cm flux	Ap
26 Sep 2019	068	007
27 Sep 2019	068	010
28 Sep 2019	068	031

Bulletin

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

There were no Earth-directed Coronal Mass Ejections (CME) observed in coronagraph data.

Proton levels were at background values and are expected to remain so.

The solar wind speed has decreased from 440 and 400 km/s over the past 24 hours. The total magnetic field strength has fluctuated around 4 nT. The Bz ranged between -5 and 3 nT, but was mainly positive. Geomagnetic conditions ranged between Kp index 1-3 (NOAA) and local K index 1-3 (Dourbes).

The solar wind conditions declined over the past 24 hours as we moved into background solar wind conditions following the passing of a high speed stream (HSS), from a small recurrent equatorial coronal hole.

Tomorrow and the next day we expect solar wind conditions to become enhanced due to the presence of a second larger recurrent coronal hole, which passed the central meridian yesterday. On the coronal holes last rotation the resultant HSS produced minor storm conditions for short periods.

Today's estimated international sunspot number (ISN): 000, based on 13 stations.

Solar indices for 25 Sep 2019

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	010
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	000 - Based on 16 stations

Noticeable events summary

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

All times in UTC

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