Vaata neljapäev, 20 mai 2021 arhiivi

SIDC igapäevane bülletään päikese ja geomagnetilise aktiivsuse kohta

Välja antud: 2021 May 20 1231 UTC

SIDC ennustus

Päikesepursked ehk loited

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Päikese prootonid

Quiet

	10 cm vool	Ap
20 May 2021	076	028
21 May 2021	076	007
22 May 2021	077	007

Bülletään

Two active regions (ARs) visible on the disk, NOAA AR 2822 (Catania 93, alpha magnetic field configuration, rotating over the west limb) and AR 2824 (Catania 96, decayed to alpha magnetic field configuration). Solar activity is very low, only B-class flares were seen in the past 24 hours. The situation is expected to remain the same for the next 24 hours.

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraphic imagery in the last 24 hours.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux remained below the 1000 pfu in the past 24 hours and is expected to remain so. The 24-hour electron fluence was at normal levels in the past 24 hours and is expected to remain so.

In the last hours, the solar wind speed has shown a gradual increase from about 320 km/s to 410 km/s, accompanied by similar increases in density and strong magnetic fields (with intensity up to 17 nT and Bz reaching -13 nT). This marks the arrival of the high speed stream from the coronal hole that crossed central meridian late on May 15. The interplanetary magnetic field polarity was mostly negative (towards the Sun). The solar wind speed is expected to increase more in the next 24 hours.

Geomagnetic conditions have been quiet to unsettled (KDourbes 1-3, Kp 1-3). Minor storm periods, and up to isolated major storm periods, can be expected due to the high speed solar wind stream arriving to the Earth.

Tänane hinnanguline rahvusvaheline päikeselaikude arv (ISN): 019, põhineb 23 jaamadel.

Päikese indeksid 19 May 2021

Catania Wolfi number	037
10cm päikesevoog	076
AK Chambon La Forêt	014
AK Wingst	007
Hinnanguline Ap	006
Hinnanguline rahvusvaheline päikeselaikude arv	025 - Põhineb 31 jaamal

Märkimisväärsete sündmuste kokkuvõte

Andmed on esitanud Päikeseinfektide Andmeanalüüsi Keskus (Solar Influences Data Analysis Center)© - SIDC - Töötleb SpaceWeatherLive

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