Viewing archive of Thursday, 13 July 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Jul 13 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
13 Jul 2017	089	003
14 Jul 2017	088	013
15 Jul 2017	087	008

Bulletin

Solar activity was at very low levels, no flares, no Coronal Mass Ejections (CMEs) were observed during the past 24 hours. NOAA 2665 decayed further and was quiet. New NOAA AR 2666 was numbered today but remained inactive. Solar protons have remained at background levels over the past 24 hours. One negative polarity southern coronal hole (small in size) will move into the geoeffective position from tomorrow (14-July-2017). Flaring activity is expected to be on B-level, C flares are also not excluded. Solar wind speed gradually declined from 515 km/s till 395 km/s. Bz was relatively stable between -3 and +3 nT. The interplanetary magnetic field was below 4 nT. The geomagnetic field was at quiet levels (planetary index KP NOAA from 0 to 1; local index K Dourbes from 1 to 3). Geomagnetic conditions are expected to remain quiet at least till midnight today (13-July-2017). From tomorrow active geomagnetic conditions are possible due to the mentioned above negative coronal hole possible geoeffectivness.

Today's estimated international sunspot number (ISN): 062, based on 24 stations.

Solar indices for 12 Jul 2017

Wolf number Catania	072
10cm solar flux	090
AK Chambon La Forêt	007
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	063 - Based on 31 stations

Noticeable events summary

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

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