Viewing archive of Friday, 6 February 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Feb 06 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
06 Feb 2015	142	006
07 Feb 2015	142	007
08 Feb 2015	146	007

Bulletin

Solar activity was low, with only a couple of isolated low level C flares. The strongest one originated from NOAA region 2280 (Catania 82) peaking at 10:17 UT at C1.4 level only. A new spotted region started to appear near S10W45. We expect some further C flaring, mainly from NOAA regions 2277 and 2280. Incomplete SOHO LASCO coronagraph data so far seem to indicate that the filament eruptions of February 4 did not result in Earth directed CMEs. Solar wind conditions showed a sector boundary crossing with the magnetic field phi angle completing the shift which was started in the previous reporting period and settling on a firmly positive value during the present reporting period. Associated with this shift the total magnetic field increased from levels around 3.5 nT to values in the 6-8 nT range. Bz was variable with negative peaks down to -6.4 nT. Solar wind speed remained in the 400 to 450 km/s range. Geomagnetic conditions were quiet to active (both NOAA Kp and local K Dourbes 1-4), with the active period associated to the sector boundary crossing. Similar solar wind conditions are expected to persist, with associated quiet to unsettled geomagnetic conditions.

Today's estimated international sunspot number (ISN): 065, based on 12 stations.

Solar indices for 05 Feb 2015

Wolf number Catania	///
10cm solar flux	142
AK Chambon La Forêt	014
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	066 - Based on 16 stations

Noticeable events summary

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

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