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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2014 Aug 18 1232 UTC

SIDC Forecast

Солнечные вспышки

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

Geomagnetism

Quiet (A<20 and K<4)

Солнечные протоны

Quiet

	10cm flux	Ap
18 Aug 2014	119	008
19 Aug 2014	124	008
20 Aug 2014	129	021

Bulletin

Solar activity was low with only an isolated C1.8 flare peaking at 19:48UT from NOAA AR 2146 while NOAA AR 2144 continued to produce a couple of moderate to high level B class flares. No Earth directed CME's were recorded. Solar activity is expected to remain low with only a slight chance for an M class flare. Solar wind speed remained around the 300 km/s level. The reporting period was marked by a couple of sector boundary crossings. After a short excursion in the negative sector at the start of the reporting period, the phi angle restored to a positive sector. It was later steadily negative between approximately 20:00 UT and 5:00 UT, but is now again positive. These sector boundary crossings were associated with some magnetic field variabilities. A negative Bz of up to -6nT just before the reporting period was associated with unsettled geomagnetic conditions after UT noon August 17 (both NOAA Kp and local K Dourbes 3). Another local period of unsettled conditions was recorded around 9:00 UT (local K Dourbes 3). Nominal wind conditions, and corresponding quiet to unsettled geomagnetic conditions are expected to continue at first. But late August 19 some period of active conditions can be expected associated with the arrival of the August 15 CME.

Today's estimated international sunspot number (ISN): 074, based on 14 stations.

Solar indices for 17 Aug 2014

Wolf number Catania	///
10cm solar flux	115
AK Chambon La Forêt	011
AK Wingst	008
Estimated Ap	008
Estimated international sunspot number	081 - Based on 21 stations

Noticeable events summary

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

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