Viewing archive of Friday, 24 July 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Jul 24 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
24 Jul 2015	091	013
25 Jul 2015	094	018
26 Jul 2015	097	009

Bulletin

There are currently 4 small sunspot groups visible on the solar disk. NOAA 2389, still close to the southeast limb, seems to show some mixed magnetic polarities. It was the source of the sole C-class flare of the period (C1.0 at 03:12UT). No earth-directed coronal mass ejections (CMEs) were observed.

There's a chance on another isolated C-class flare.

Solar wind speed gradually declined from values between 500 and 550 km/s to its current 400 km/s. Bz fluctuated between -8 and +6 nT. Active episodes were observed between 17:00-21:00UT. A small equatorial positive coronal hole is transiting the central meridian.

Mostly quiet to unsettled geomagnetic conditions are expected, with a chance on an active period in response to the high speed stream from the positive CH on the northern hemisphere.

Today's estimated international sunspot number (ISN): 037, based on 15 stations.

Solar indices for 23 Jul 2015

Wolf number Catania	029
10cm solar flux	089
AK Chambon La Forêt	021
AK Wingst	023
Estimated Ap	019
Estimated international sunspot number	033 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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