Viewing archive of Saturday, 28 March 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Mar 28 1230 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
28 Mar 2015	138	012
29 Mar 2015	137	008
30 Mar 2015	138	007

Bulletin

The solar activity remains low, as it was during the whole week, with mostly low C-class flares reported. The strongest flare reported in last 24 hours was C2.2 flare which peaked at 05:26 UT this morning. The flare originated from the Catania sunspot group 13 (NOAA AR 2305) which has slightly increased in the size and the sunspot number but has retained the beta-gamma configuration of its photospheric magnetic field. We expect C-class flares and possibly, but not probably also an isolated M-class flare. No Earth directed CMEs were observed during last 24 hours. The Earth is inside a slow solar wind with the speed of about 420 km/s. The interplanetary magnetic field has increased this morning and reached value of about 11 nT, this increase is probably due to the passage of the transient structure in the slow solar wind. At the same time the Bz component of the interplanetary magnetic field had 2 hours long interval of its negative value, amounting about -8 nT. The fast flow associated with the extend of the southern polar coronal hole might be expected in the afternoon of March 30. The geomagnetic conditions are quiet and expected to remain so in the coming hours.

Today's estimated international sunspot number (ISN): 057, based on 12 stations.

Solar indices for 27 Mar 2015

Wolf number Catania	///
10cm solar flux	138
AK Chambon La Forêt	010
AK Wingst	010
Estimated Ap	008
Estimated international sunspot number	077 - Based on 16 stations

Noticeable events summary

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

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