Viewing archive of Saturday, 23 April 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Apr 23 1230 UTC

SIDC Forecast

Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
23 Apr 2016	077	007
24 Apr 2016	079	007
25 Apr 2016	081	007

Bulletin

Quiet solar weather conditions were observed without any significant flaring activity. The X-ray flux remained below the C level. Catania sunspot group 59 (NOAA active region 2532) dissolved while Catania group 60 (NOAA active region 2533) remained a simple unipolar spot. Quiet conditions are expected over the next days with a very low probability for C flares. No Earth directed CME's have been observed.

The rise in the total interplanetary magnetic field strength that was observed at the end of the previous reporting period persisted and was accompanied by an increase of also the solar wind speed just after the start of the reporting period, thus marking the expected arrival of the influence of the high speed stream from the transequatorial coronal hole. The solar wind speed reached a maximum of just over 600 km/s after 19:00UT. The total magnetic field reached a maximum of around 14 nT early in the period. The Bz component was mostly positive but reached some strongly negative values of around -12 nT also early in the period. The magnetic field phi angle indicated a positive sector. Solar wind conditions have meanwhile decayed to nominal with speed around 420 km/s and magnetic field around 5nT. Solar wind conditions or expected to continue to be at nominal levels.

Geomagnetic conditions were quiet to active with only unsettled conditions locally (local K Dourbes 1-3) and a single active period at planetary level (NOAA Kp reached 4 for the 21-24UT interval). Quiet geomagnetic conditions are expected over the next days.

Today's estimated international sunspot number (ISN): 014, based on 15 stations.

Solar indices for 22 Apr 2016

Wolf number Catania	024
10cm solar flux	077
AK Chambon La Forêt	019
AK Wingst	020
Estimated Ap	018
Estimated international sunspot number	018 - Based on 29 stations

Noticeable events summary

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

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