Viewing archive of Sunday, 25 October 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Oct 25 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
25 Oct 2015	105	008
26 Oct 2015	100	011
27 Oct 2015	095	008

Bulletin

Solar activity was low with two lower C-class flares. The source region was NOAA active region (AR) 2434, which is close to the west limb. NOAA AR 2436 became slightly more complex in its trailing part, while the other regions were stable. Flares at the C-level are expected. No Earth- directed CMEs were observed.

A shock was observed in the solar wind around 18:30 UT on October 24. Solar wind speed, density and temperature made a jump. The magnitude of the Interplanetary Magnetic Field (IMF) has reached a magnitude of 14 nT with a mainly positive Bz component varying from -9 to 10 nT. Solar wind speed reached 540 km/s. The shock is probably related to the October 22 CME. Geomagnetic conditions are quiet (K<3) to unsettled (K=3), which is mainly expected to continue.

Today's estimated international sunspot number (ISN): 063, based on 14 stations.

Solar indices for 24 Oct 2015

Wolf number Catania	///
10cm solar flux	106
AK Chambon La Forêt	///
AK Wingst	011
Estimated Ap	011
Estimated international sunspot number	079 - Based on 15 stations

Noticeable events summary

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

All times in UTC

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