Viewing archive of Tuesday, 27 August 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Aug 27 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
27 Aug 2019	066	019
28 Aug 2019	066	010
29 Aug 2019	066	007

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.

The Earth is currently under the influence of a high speed solar wind regime. The solar wind speed was fluctuating around 320 km/s, but has now increased to around 580 km/s. The total magnetic field strength has fluctuated between 2 nT and 12 nT. The Bz component fluctuated around 0 nT, ranging between -8 and +11 nT (as recorded by ACE). Geomagnetic conditions ranged between Kp index 1-3 (NOAA) and local K index 0-3 (Dourbes) over the past 24 hours.

A recurrent low latitude equatorial coronal hole of negative polarity passed the central meridian yesterday. The effect of the High Speed Stream (HSS) was initially experienced this morning at 04:00 UT when we experienced a ramp up in the solar wind speed as we entered the HSS produced by the hole. Last rotation, this coronal hole did not produce major enhancements in the solar wind conditions (solar wind speed remained below 600 km/s and the total interplanetary magnetic field was below 10 nT). However, enhanced solar wind conditions may be experienced this rotation.

Today's estimated international sunspot number (ISN): 000, based on 22 stations.

Solar indices for 26 Aug 2019

Wolf number Catania	///
10cm solar flux	///
AK Chambon La Forêt	014
AK Wingst	007
Estimated Ap	007
Estimated international sunspot number	000 - Based on 31 stations

Noticeable events summary

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

All times in UTC

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