Viewing archive of Wednesday, 28 August 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Aug 28 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
28 Aug 2019	066	010
29 Aug 2019	066	009
30 Aug 2019	066	008

Bulletin

The solar activity has been quiet over the past 24 hours. The Sun is currently spotless and the X-ray flux remained below B-level. Solar activity is expected to remain at low levels for the next 24 hours.

No Earth-directed coronal mass ejections (CME) were observed over the past 24 hours in the available coronagraph imagery. The greater than 10 MeV proton flux remained at background levels over the past 24 hours and is expected to remain at low levels. There is a currently a large low latitude coronal hole approaching the central meridian of the Sun.

The Earth is currently under the influence of a high speed solar wind regime. The solar wind speed has fluctuated between 430 and 510 km/s. The total magnetic field strength has decreased from around 8 nT to 3 nT over the past 24 hours. The Bz component fluctuated around 0 nT, ranging between -5 and +5 nT (as recorded by ACE). Geomagnetic conditions ranged between Kp index 2-3 (NOAA) and local K index 1-3 (Dourbes) over the past 24 hours.

A recurrent low latitude equatorial coronal hole of negative polarity passed the central meridian two days ago. The effect of the High Speed Stream (HSS) was initially experienced yesterday morning at 04:00 UT when a ramp up in the solar wind speed was experienced, the solar wind speeds are expected to abate later today/tomorrow. A second low latitude is approaching sun centre, and the associated HSS is anticipated to reach Earth around 31-Aug-2019.

Today's estimated international sunspot number (ISN): 000, based on 15 stations.

Solar indices for 27 Aug 2019

Wolf number Catania	///
10cm solar flux	066
AK Chambon La Forêt	015
AK Wingst	///
Estimated Ap	015
Estimated international sunspot number	000 - Based on 30 stations

Noticeable events summary

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

All times in UTC

<< Go to daily overview page