Viewing archive of Wednesday, 25 September 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Sep 25 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
25 Sep 2019	067	009
26 Sep 2019	067	007
27 Sep 2019	066	017

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 fluctuated between 350 and 500 km/s over the past 24 hours. The total magnetic field strength has fluctuated between 2 and 17 nT peaking at 17:00 UT yesterday. The Bz between -9 and 15 nT. Geomagnetic conditions ranged between Kp index 1-4 (NOAA) and local K index 0-3 (Dourbes).

The solar wind conditions became enhanced late yesterday and early this morning due to the arrival of a high speed stream (HSS) from a recurrent equatorial coronal hole. Solar wind conditions are expected to be enhanced throughout the day, before abating later today / early tomorrow. As a consequence geomagnetic conditions are expected to be unsettled, with some active periods due to HSS solar wind enhancements.

Around 27-Sep-2019 we may begin to feel the effects from a second larger recurrent coronal hole, which has just passed the central meridian. On the coronal holes last rotation the resultant HSS produced Kp 6 (NOAA).

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

Solar indices for 24 Sep 2019

Wolf number Catania	///
10cm solar flux	067
AK Chambon La Forêt	015
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	000 - 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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