Viewing archive of Saturday, 20 July 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Jul 20 1408 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
20 Jul 2013	114	015
21 Jul 2013	113	015
22 Jul 2013	113	012

Bulletin

The only C-class flare reported during the last 24 hours was C2.1 flare originating from the NOAA AR 1793. This active region currently has beta- gamma configuration of the photosperic magnetic field and the potential to produce C-class and possibly M-class flares. The newly arrived data showed that the CME on July 18 associated with the prominence eruption on the east solar limb, is most probably not Earth-directed. The Earth is still inside the fast speed stream due to the low-latitude coronal hole in the northern hemisphere. At the moment the solar wind speed is 530 km/s and the interplanetary magnetic field (IMF) is rather stable with the magnitude of about 2 nT. We expect unsettled to active geomagnetic conditions due to the currently ongoing influence of the fast stream. The arrival of the fast flow from the low-latitude coronal hole (also crossing the equator) in the southern hemisphere, which just reached the central meridian is expected on July 23.

Today's estimated international sunspot number (ISN): 037, based on 12 stations.

Solar indices for 19 Jul 2013

Wolf number Catania	///
10cm solar flux	114
AK Chambon La Forêt	023
AK Wingst	020
Estimated Ap	019
Estimated international sunspot number	058 - Based on 25 stations

Noticeable events summary

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

All times in UTC

<< Go to daily overview page