Viewing archive of Wednesday, 12 July 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Jul 12 1259 UTC

SIDC Forecast

Solar flares

M-class flares expected (probability >=50%)

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
12 Jul 2017	091	003
13 Jul 2017	090	004
14 Jul 2017	091	012

Bulletin

Solar activity was low with NOAA AR region 2665 (Catania group 36) producing B and C class flares. The strongest C1.2 flare was peaking at 20:31UT yesterday. The group evolved into a Beta-Gamma configuration, however it's magnetic complexity decreased during the period. Few slow and narrow (not Earth directed CMEs) were detected by Cactus during the past 24 hours. A small negative polarity southern coronal hole may create enhanced solar wind conditions on the day 3 (14-Jul-2017). Solar proton flux values are at background levels and expected to remain so. More C-class flares can be expected (and less likely M-flares). Solar wind parameters reflected a fainting influence of a high speed stream from an equatorial coronal hole. Total magnetic field remained below 5 nT, while Bz component was fluctuating between +/-3 nT over the past 24 hours. Solar wind speed gradually decreased from 620 km/s till 510 km/s. Geomagnetic conditions were very quiet. Planetary index Kp decreased from 2 to 1, while the local K index (Dourbes) was fluctuating between 1 and 3 over the past 24 hours. The geomagnetic field is expected to be at quiet levels today and tomorrow, while on the day 3 (14-Jul-2017) active geomagnetic conditions can be expected due to the influence of a small negative polarity southern coronal hole.

Today's estimated international sunspot number (ISN): 062, based on 21 stations.

Solar indices for 11 Jul 2017

Wolf number Catania	041
10cm solar flux	091
AK Chambon La Forêt	014
AK Wingst	010
Estimated Ap	011
Estimated international sunspot number	039 - Based on 29 stations

Noticeable events summary

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

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