Viewing archive of Friday, 1 August 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Aug 01 1232 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
01 Aug 2014	163	009
02 Aug 2014	167	018
03 Aug 2014	170	006

Bulletin

There are currently 9 sunspot groups visible. Fast growing NOAA 2132 produced the strongest event of the period: a C8 flare peaking at 00:18UT. Together with NOAA 2130, which produced only low-level C-class flares, they are magnetically the most complex active regions on the solar disk. NOAA 2127 simplified, and remained quiet. A small filament on the northern hemisphere near the central meridian (CM) erupted. Evaluation of any associated CME is pending the availability of coronagraphic images. The other filaments have been stable. No Earth-directed CMEs were observed over the last 24 hours. There remains a chance for an M-class flare, in particular from NOAA 2130 and 2132. In response to the sector boundary crossing from 31 July around 11:00UT (ACE), solar wind speed gradually increased from 300 to 350 km/s, with Bz varying between -8 and +10 nT. Geomagnetic conditions were quiet, with locally some unsettled periods towards the end of the reporting window. A small equatorial coronal hole is transiting the CM and may influence the geomagnetic field on 4 August. Quiet geomagnetic conditions are expected until the possible glancing blow from the 30 July CME, which may locally lead to active geomagnetic conditions on 2 August.

Today's estimated international sunspot number (ISN): 125, based on 12 stations.

Solar indices for 31 Jul 2014

Wolf number Catania	///
10cm solar flux	156
AK Chambon La Forêt	009
AK Wingst	008
Estimated Ap	005
Estimated international sunspot number	/// - Based on /// stations

Noticeable events summary

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

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