Viewing archive of Sunday, 29 September 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Sep 29 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
29 Sep 2019	068	018
30 Sep 2019	068	010
01 Oct 2019	068	005

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 650 and 540 km/s over the past 24 hours. The total magnetic field strength has fluctuated around 5 nT. The Bz ranged between -4 and 4 nT. Geomagnetic conditions ranged between Kp index 2-5 (NOAA) and local K index 1-4 (Dourbes).

The enhanced solar wind conditions experienced are from a high speed stream (HSS) from a recurrent positive polarity coronal hole. The solar wind speeds are now starting to abate and should return to nominal levels in a couple of days.

Geomagnetic conditions are expected to be unsettled, with some active periods due to HSS solar wind enhancements.

Today's estimated international sunspot number (ISN): 000, based on 11 stations.

Solar indices for 28 Sep 2019

Wolf number Catania	///
10cm solar flux	067
AK Chambon La Forêt	029
AK Wingst	027
Estimated Ap	030
Estimated international sunspot number	000 - Based on 26 stations

Noticeable events summary

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

All times in UTC

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