Vaata pühapäev, 12 detsember 2021 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2021 Dec 12 1233 UTC

SIDC Forecast

Päikesepursked ehk loited

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

Geomagnetism

Quiet (A<20 and K<4)

Päikese prootonid

Quiet

	10cm flux	Ap
12 Dec 2021	077	004
13 Dec 2021	079	011
14 Dec 2021	080	011

Bulletin

Solar activity was at low levels with the X-ray flux below C-class flare over the last 24 hours. Some flaring activities (B-class flares) were observed in a returning region currently still behind the East limb around latitude -20 degrees. Solar activity is expected to remain at low levels with with a slight chance for a C-class flare from this returning region.

No Earth directed CMEs has been detected in the available coronagraph imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours and is expected to remain at nominal levels in the next 24 hours. The greater than 2 MeV electron flux remained below the 1000 pfu alert threshold and is expected to remain below this level during the next 24 hours. The greater than 2 MeV electron fluence was moderate levels in the past 24 hours and is expected to be at between nominal and moderate levels in the next 24 hours.

The solar wind parameters (ACE+DSCOVR) is slightly enhanced due to the influence to the high-speed streams from the small equatorial coronal hole (negative polarity, north hemisphere) that traverse the central meridian on Dec 05. The total magnetic field reached 8.1 nT, and its southward component, Bz, fluctuated between -5.7 nT and +4.4 nT in the past 24 hours , while the wind speed remained slow ranging between 285 km/s and 331 km/s. The solar wind parameters are expected to show some further enhancement and the increase of the wind speed. The high-speed streams associated to the other small equatorial coronal hole (negative polarity, south hemisphere, that crossed the central meridian on December 8) may also slightly enhance the solar wind parameters near Earth later around December 12-13.

Geomagnetic conditions were quiet over the past 24 hours (NOAA Kp and K-BEL recorded values 0 to 2). Geomagnetic conditions are expected to remain mostly quiet with some unsettled periods in response to the influence of the wind streams associated to the small equatorial coronal hole.

Today's estimated international sunspot number (ISN): 013, based on 08 stations.

Solar indices for 11 Dec 2021

Wolf number Catania	///
10cm solar flux	076
AK Chambon La Forêt	006
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	000 - Based on 18 stations

Noticeable events summary

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

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