Visualizzazione archivio di venerdì, 21 maggio AM

Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2021 May 21 1231 UTC

SIDC Forecast

Valid from 1230 UTC, 21 May 2021 until 23 May 2021
Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

10cm fluxAp
21 May 2021072013
22 May 2021074010
23 May 2021076007

Bulletin

Solar activity has been very low, only one active region visible: NOAA AR 2824 (Catania 96, alpha magnetic field configuration). Only B-class flares seen in 24 hours, some of them from a new active region rotating into view from the east limb, solar activity may increase as a result in the coming 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, it is expected to increase in the coming 24 hours. The 24-hour electron fluence was at normal levels in the past 24 hours, it is expected to increase in the coming 24 hours.

A high speed solar wind (HSS) stream arrived to the Earth in the past 24 hours. The speed increased to 600 km/s, with interplanetary magnetic field magnitudes up to 19 nT, with Bz reaching - 13 nT. The polarity of the magnetic field was mostly negative (towards the Sun). The solar wind speed is still elevated, but the magnetic field intensity has reduced to about 4 nT. Similar conditions are expected for the next 24 hours.

Geomagnetic conditions have reached minor storm levels (KDourbes 2-5, Kp 2-5) due to the HSS effect. Mostly unsettled conditions, with possible active periods, can be expected for the next 24 hours.

Today's estimated international sunspot number (ISN): 013, based on 19 stations.

Solar indices for 20 May 2021

Wolf number Catania026
10cm solar flux072
AK Chambon La Forêt035
AK Wingst028
Estimated Ap027
Estimated international sunspot number018 - Based on 32 stations

Noticeable events summary

DayBeginMaxFineLocStrengthOP10cmCatania/NOAARadio burst types
Nessuna

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

Tutti gli orari in UTC

<< Vai alla pagina della panoramica giornaliera

Ultime notizie

Supporta SpaceWeatherLive.com!

Molte persone vengono su SpaceWeatherLive per seguire l'attività del Sole o sapere se ci sia la possibilità di vedere l'aurora, ma a maggior traffico corrispondono costi maggiori. Considerate una donazione se vi piace SpaceWeatherLive così che possiamo mantenere online il sito web!

Dona SpaceWeatherLive Pro
Supporta SpaceWeatherLive con il nostro merchandise
Dai un'occhiata al nostro merchandise

Notizie sul meteo spaziale

Ultimo brillamento X2025/03/28X1.1
Ultimo brillamento M2025/04/01M2.5
Ultima tempesta geomagnetica2025/03/27Kp5 (G1)
Giorni senza macchie
Ultimo giorno senza macchie2022/06/08
Media mensile Numero di Macchie Solari
marzo 2025134.2 -20.4
aprile 2025143 +8.8
Ultimi 30 giorni129.8 -16.3

Questo giorno nella storia*

Brillamenti solari
12002M8.82
21999M6.76
32001M2.91
42003M2.74
52001M2.31
DstG
11979-202G3
21988-133G3
31984-120G4
42004-117G2
51994-111G3
*dal 1994

Social networks