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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2013 Oct 27 1205 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
27 Oct 2013	158	006
28 Oct 2013	160	023
29 Oct 2013	159	023

Bulletin

There were two M flares and eleven C flares on the Sun in the past 24 hours. New region NOAA AR 11884 in the East produced an M3.1 flare peaking at 19:27 UT on October 26 while beta-gamma-delta region AR 11882 released an M1.0 flare peaking at 19:53 UT on October 26. The other flares were produced by AR 11882, 11875, 11877 and 11873. In the next 48 hours, M flares are expected, with a chance for X flares. LASCO C2 and STEREO COR2 A and B observed several CMEs on October 26 and 27, among which a partial halo CME first registered by LASCO C2 at 11:24 UT on October 26 (associated with the M1.8 flare of 11:17 UT). This CME could deliver a glancing blow in the second half of October 29. ACE observed a jump in the solar wind at 21:44 UT on October 26. Solar wind speed jumped from about 280 to 310 km/s, while the Interplanetary Magnetic Field jumped from 4.5 to 6.5 nT. A smooth decrease in the phi angle clearly shows rotation of the Interplanetary Magnetic Field consistent with the flux rope of an ICME. This jump was probably the result of the arrival of the October 22 (M4.2) CME. Phi jumped from 110 to 270 degrees around 9h UT on October 27, probably indicating the end of the (weak) ICME influence and return to nominal conditions, with solar wind speed around 270 km/s and Interplanetary Magnetic Field around 2 nT. Geomagnetic activity was at quiet levels (K Dourbes between 0 and 2; NOAA Kp between 0 and 1) during the past 24 hours. Quiet geomagnetic conditions (K Dourbes < 4) are expected for the second half of October 27 and the first half of October 28. Active conditions with minor storm intervals are possible on the second half of October 28 and the first half of October 29, due to the expected joint arrival of several CMEs, mainly from October 25. Active geomagnetic levels are possible in the second half of October 29, due to a possible glancing blow by the partial halo CME of October 26.

Today's estimated international sunspot number (ISN): 099, based on 13 stations.

Solar indices for 26 Oct 2013

Wolf number Catania	///
10cm solar flux	165
AK Chambon La Forêt	005
AK Wingst	002
Estimated Ap	001
Estimated international sunspot number	090 - Based on 20 stations

Noticeable events summary

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

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