Vaata kolmapäev, 29 aprill 2015 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2015 Apr 29 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 29 Apr 2015 until 01 May 2015
Päikesepursked ehk loited

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

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

Päikese prootonid

Quiet

10cm fluxAp
29 Apr 2015100008
30 Apr 2015105016
01 May 2015105008

Bulletin

The active regions are currently stable or decaying, except for a new developing small sunspot group Catania 48. No flares occurred during the past period. SDO/AIA and H-alpha GONG images indicate a few filament eruptions on April 28 in the Eastern hemisphere. The eruption of the extended filament, which was stretching from S05E10 to N40E80, started around 11:00 UT. An associated partial halo CME was detected in SOHO/LASCO images, with first measurement at 14:29 UT. The CME is mainly propagating to the North-East of the Sun-Earth line, with an estimated projected speed of 361 km/s (CACTus estimate). At most a glancing blow will arrive at Earth on May 2 at the end of the UT day. Another faint, asymmetric CME was observed in SOHO/LASCO-C2, with first measurement at 2:48 UT on April 29, which is perceived as a backside event. There is a limited chance (20%) for C-class flares during the next 24 hours. The Interplanetary Magnetic Field magnitude is fluctuating between 0 and 8 nT, while the solar wind speed obtains values between 280 and 360 km/s. Quiet to unsettled (local K=0 to 3 at Dourbes) geomagnetic conditions were observed and are largely expected to remain so. There is some chance for a few time slots of active (K=4) to minor storm (K=5) conditions, due to an expected flow from a positive polarity coronal hole on April 30.

Today's estimated international sunspot number (ISN): 022, based on 14 stations.

Solar indices for 28 Apr 2015

Wolf number Catania061
10cm solar flux108
AK Chambon La Forêt009
AK Wingst007
Estimated Ap006
Estimated international sunspot number032 - Based on 23 stations

Noticeable events summary

DayBeginMaxLõppLocStrengthOP10cmCatania/NOAARadio burst types
Puuduvad

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

Kõik ajad UTC-s

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