Vaata neljapäev, 28 september 2017 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2017 Sep 28 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 28 Sep 2017 until 30 Sep 2017
Päikesepursked ehk loited

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

Geomagnetism

Major (ISES: Severe) magstorm expected (A>=100 or K>=7)

Päikese prootonid

Quiet

10cm fluxAp
28 Sep 2017092071
29 Sep 2017090017
30 Sep 2017089006

Bulletin

Over the past 24 hours solar activity has been very low. Three numbered active regions on the visible side of solar disk reduced their magnetic complexity (from Beta to Alpha class) and have not shown any flaring activity. No Earth directed Coronal Mass Ejections (CMEs) have been detected. 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 small chance of C-class flares. The Earth is presently inside the fast solar wind stream with the speed of about 710 km/s. The interplanetary magnetic field magnitude decreased from 14 nT till about 4 nT over the past 24 hours. Arrival of the interaction region between the slow and the fast solar wind from a low-latitude extension of the northern polar coronal hole induced yesterday at 18UT moderate geomagnetic storm conditions: NOAA Kp = 6 (with local K = 4 at Dourbes). The interaction region was followed by the fast stream, with the solar wind speed reaching 690 km/s which induced strong geomagnetic storm at 03UT today: NOAA Kp = 7 (with local K = 5 at Dourbes). The solar wind speed is still rather high, however interplanetary magnetic field variations slightly decreased few hours ago. Geomagnetic conditions are presently at minor storm level (Kp = 5 from 12 UT today), and we expect active to minor storm level (Kp up to 5) conditions in the coming hours.

Today's estimated international sunspot number (ISN): 048, based on 19 stations.

Solar indices for 27 Sep 2017

Wolf number Catania///
10cm solar flux091
AK Chambon La Forêt064
AK Wingst034
Estimated Ap035
Estimated international sunspot number042 - Based on 26 stations

Noticeable events summary

DayBeginMaxLõppLocStrengthOP10cmCatania/NOAARadio burst types
Puuduvad

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

Kõik ajad UTC-s

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