Viewing archive of Tuesday, 11 April 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Apr 11 1337 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
11 Apr 2017	075	016
12 Apr 2017	074	012
13 Apr 2017	075	009

Bulletin

Solar activity was at very low levels during the period. Low-level B-class flaring was observed from a new active region at the east limb NOAA 2650 (B4.8, B1.6, B3.9, B1.3, B1.3). The filament eruption from the NE quadrant of the Sun is associated with a CME first observed in LASCO-C2 coronograph imagery at 23:28 UT 10 April. WSA/Enlil modeling determined a possible glancing blow from the CME, with arrival on 15 April. The greater than 10MeV proton flux was at nominal levels. Quiet flaring conditions are expected, with a chance on an isolated C-class flare. Solar wind parameters were at nominal levels. Solar wind speed was around 425 km/s. Bz fluctuated between -5.8 and +5.2 nT from 00UT today. A weak connection to an isolated, positive polarity coronal hole is expected to enhance the solar wind conditions slightly more today. The geomagnetic field was at quiet to active levels (Kp NOAA index: 1-4, K Dourbes index: 1-3). Geomagnetic conditions are expected to be quiet to active.

Today's estimated international sunspot number (ISN): 014, based on 25 stations.

Solar indices for 10 Apr 2017

Wolf number Catania	///
10cm solar flux	074
AK Chambon La Forêt	008
AK Wingst	005
Estimated Ap	005
Estimated international sunspot number	014 - Based on 31 stations

Noticeable events summary

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

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