Viewing archive of Monday, 28 July 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Jul 28 1234 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
28 Jul 2014	125	008
29 Jul 2014	128	004
30 Jul 2014	130	004

Bulletin

There are 8 relatively small sunspot groups visible. NOAA 2127, still close to the southeast limb, and NOAA 2126 produced each one C1.2 flare (peaking resp. at 14:18UT yesterday and at 11:45UT today). Both regions seem to have some mixed magnetic polarity. No Earth-directed CMEs were observed. Some 10-20 degrees long filaments are observed in the NE, SE and NW solar quadrant, as well as in NOAA 2121. There's a chance on further C-class flaring, in particular from NOAA 2127 and 2126. An eruption of one of the filaments is possible. A disturbance was observed in ACE solar wind data starting shortly after 03:00UT. Over the next four hours, wind speed gradually increased from 350 to 430 km/s, while Bz varied between +11 and -8 nT, being mostly positive near the end of the period. The geomagnetic field was unsettled to locally active in response to this disturbance. Quiet to unsettled geomagnetic conditions are expected, with locally an active period possible.

Today's estimated international sunspot number (ISN): 083, based on 11 stations.

Solar indices for 27 Jul 2014

Wolf number Catania	///
10cm solar flux	121
AK Chambon La Forêt	008
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	062 - Based on 22 stations

Noticeable events summary

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

All times in UTC

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