Viewing archive of Monday, 27 August 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 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 2018	071	011
28 Aug 2018	071	006
29 Aug 2018	070	013

Bulletin

Over the past 24 hours solar activity has been Low. No significant flares have been recorded. There are currently two ARs visible on the solar disk (2719 and 2720), but both have only shown activity at the B-class level, and HMI magnetogram observations indicate only a small amount of flux emergence and cancellation. These regions will reach the West limb in a couple of days. There is currently a large filament located in the North at central latitudes, but appears stable. The greater than 10MeV proton flux remained at background levels over the past 24 hours. Solar activity is expected to remain low over the next 24 hours with a low probability of C-class flares and a low probability of M-class flares. The solar wind speed has fluctuated between 410 and 590 km/s over the past 24 hours. The total magnetic field strength has slowly decreased from around 20 to 4 nT. The Bz component was largely negative yesterday, reaching -15 nT, but this morning has fluctuated between -4 and +4 nT. Geomagnetic conditions ranged between Kp index 2-7 (NOAA) and local K index 1-6 (Dourbes) over the past 24 hours. The enhanced geomagnetic conditions reached major storm levels on a planetary level due to the enhanced magnetic field with persistent Southward orientation associated with the passing of a magnetic cloud related to the 2018-Aug-20 CME. Conditions have since returned to background levels, however small enhancements may be experienced as the remnants of the CME pass Earth. There is currently a region of patchy coronal hole located near disk centre which may enhance solar wind speeds slightly over the next couple of days. Geomagnetic conditions are expected to be quiet to active.

Today's estimated international sunspot number (ISN): 013, based on 16 stations.

Solar indices for 26 Aug 2018

Wolf number Catania	///
10cm solar flux	071
AK Chambon La Forêt	055
AK Wingst	062
Estimated Ap	068
Estimated international sunspot number	030 - Based on 28 stations

Noticeable events summary

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

All times in UTC

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