Vaata neljapäev, 31 august 2017 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2017 Aug 31 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 31 Aug 2017 until 02 Sep 2017
Päikesepursked ehk loited

C-class flares expected, (probability >=50%)

Geomagnetism

Minor storm expected (A>=30 or K=5)

Päikese prootonid

Quiet

10cm fluxAp
31 Aug 2017088039
01 Sep 2017087035
02 Sep 2017087031

Bulletin

Over the past 24 hours solar activity remained low. There are currently tree active regions on the visible discs. Catania group 47 (NOAA region 2674) produced several C-class flare, the major one was a C5.2-class flare peaking at 18:50. Catania group 43 (NOAA region 2672) produced only B-class flare and narrow CMEs. We expect the solar activity to remain low with a probability of few sporadic C-class flare.

No Earth directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph imagery and the solar protons remains at background level.

The high speed stream has arrived and the Earth is presently inside the fast solar wind with the speed that increased up to 700 km/s according to ACE data. The interplanetary magnetic field magnitude reached 30 nT around 06:00UT on August 31 and has now decreased and remains below 10 nT. The Bz component has fluctuating between -20 and 20 nT and remains now around -5 nT.

The active geomagnetic conditions observed on August, 29 (Kp and K-Dourbes = 4) turned out to be caused by a sector boundary crossing, which was announcing the soon arrival of the high speed stream. After returning to quiet levels, the geomagnetic conditions have become active again around 08:00 UT (Kp=5 and K-Dourbes=4) due to the arrival of the high speed stream. K-Dourbes has then reached 6 at 10:00 UT. The geomagnetic conditions will remain disturbed for the next 48 h with active to minor storm conditions expected.

Today's estimated international sunspot number (ISN): 068, based on 23 stations.

Solar indices for 30 Aug 2017

Wolf number Catania049
10cm solar flux087
AK Chambon La Forêt007
AK Wingst003
Estimated Ap004
Estimated international sunspot number047 - Based on 27 stations

Noticeable events summary

DayBeginMaxLõppLocStrengthOP10cmCatania/NOAARadio burst types
Puuduvad

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

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