Viewing archive of Wednesday, 23 July 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Jul 23 1229 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 Jul 2014	096	004
24 Jul 2014	099	007
25 Jul 2014	102	007

Bulletin

Solar activity has remained quiet with background X-ray flux close to the B2 level and an occasional moderate B flare (A B5.7 flare from Catania group 22 / NOAA AR 2121 peaking at 5:42 UT and a B5.5 flare from Catania group 20 / NOAA AR 2019 peaking at 7:42 UT). Without significant further development of the active regions presently on disc, quiet solar conditions are expected to continue, and the all quiet alert is maintained. A partial halo CME with an angular width of close to 180 degrees (underestimated by Cactus as 118 degrees) was visible in SOHO/LASCO C2 from 18:00UT July 22 onwards. The mass was expelled in north-western direction from the Sun Earth line. Coronal imagery (PROBA2/SWAP, SDO/AIA, as well as STEREO A EUVI) shows the event to originate from at or just around the western limb at a latitude of around 30 degrees North. Consequently no influence on Earth is expected. Solar wind speed has dropped gradually from its slightly enhanced values at the start of the reporting period (around 350 km/s) to just over 300 km/s presently. The total magnetic field was within the 3-5nT range with variable Bz within the +/-4nT range. Geomagnetic conditions were mostly quiet (NOAA Kp 1-2) with a short period of local unsettled conditions just after UT noon July 22 (K Dourbes 3 returning to 2 afterwards and 0-1 presently). Nominal solar wind conditions and associated quiet geomagnetic conditions are expected to continue over the next days.

Today's estimated international sunspot number (ISN): 047, based on 21 stations.

Solar indices for 22 Jul 2014

Wolf number Catania	046
10cm solar flux	093
AK Chambon La Forêt	010
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	031 - Based on 26 stations

Noticeable events summary

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

All times in UTC

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