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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2015 Oct 27 1230 UTC

SIDC Forecast

Солнечные вспышки

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

Geomagnetism

Quiet (A<20 and K<4)

Солнечные протоны

Quiet

	10cm flux	Ap
27 Oct 2015	106	006
28 Oct 2015	106	007
29 Oct 2015	106	007

Bulletin

Solar activity was low. The X ray flux initially only briefly touched the C level with a C1 flare from Catania group 54 (NOAA 2436) peaking at 5:14UT. However, just before the end of the reporting period X-ray flux increased due to an ongoing C1.5 flare (peak at 12:11 UT) from a region at or beyond the East limb. The new Catania group 56 (NOAA 2440) grew as it was passing the central meridian with also another sunspot group (Catania 57) emerging behind it. Flaring is expected at C level mainly from the new regions, Catania 54 (NOAA2436) and the unnumbered region at the East limb. Yesterdays C2.1 flare seems to have caused a CME off the West limb, however currently available coronagraph images do not yet allow a conclusive analysis of its extent. Solar wind speed saw a gradual decline from around 480 km/s to 360 km/s. Total magnetic field also declined from around 6.8 nT to around 5 nT. Bz was between -3.5 nT and 4.4 nT. The magnetic field phi angle was stable in the positive sector. Geomagnetic conditions were quiet (both local K Dourbes and NOAA Kp 0-2). Solar wind conditions are expected to remain nominal with associated quiet geomagnetic conditions.

Today's estimated international sunspot number (ISN): 068, based on 18 stations.

Solar indices for 26 Oct 2015

Wolf number Catania	///
10cm solar flux	106
AK Chambon La Forêt	005
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	071 - Based on 32 stations

Noticeable events summary

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

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