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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2015 Oct 19 1230 UTC

SIDC Forecast

Солнечные вспышки

M-class flares expected (probability >=50%)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Солнечные протоны

Quiet

	10cm flux	Ap
19 Oct 2015	120	007
20 Oct 2015	120	006
21 Oct 2015	120	011

Bulletin

Solar activity was low with only four low level C-class flares (C1.7 being the maximum) from NOAA active regions 2434 and 2436 and 2437. NOAA AR 2437, which had produced a few M-class flares on October 17, has rounded the East limb only producing flares at the C-level during the past period. Catania sunspot region 52 is a new region near S09E12. No Earth- directed CMEs were observed. Flaring activity at the C-level is expected.

The solar wind speed decreased from about 480 km/s to 400 km/s. The magnetic field magnitude currently is about 5 nT with a mainly negative Bz component. Mostly quiet to unsettled geomagnetic conditions were observed, which are expected to continue. There is a chance for a few episodes of active to minor storming conditions due to the moderate speed stream from an equatorial coronal hole, expected to arrive on October 21.

Today's estimated international sunspot number (ISN): 087, based on 09 stations.

Solar indices for 18 Oct 2015

Wolf number Catania	///
10cm solar flux	120
AK Chambon La Forêt	023
AK Wingst	017
Estimated Ap	020
Estimated international sunspot number	071 - Based on 17 stations

Noticeable events summary

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

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