Visualizzazione archivio di domenica, 31 ottobre AM

Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2021 Oct 31 1242 UTC

SIDC Forecast

Valid from 1230 UTC, 31 Oct 2021 until 02 Nov 2021
Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

10cm fluxAp
31 Oct 2021110007
01 Nov 2021108001
02 Nov 2021103001

Bulletin

Solar flaring activity was low during the last 24 hours, with seven C-class flares detected from two Active Regions (ARs). More specifically, NOAA AR 2887 produced two C-class flares and NOAA AR 2891 produced the remaining five. NOAA AR 2887 has now lost a significant portion of its magnetic complexity and is not expected to produce any X-class flares. There is a reduced but significant chance for an isolated M-class flare and the C-class flare activity is expected from this AR for the next 24 hours. NOAA AR 2891 is expected to continue its C-class flare activity, with a small chance of an M-class flare, in the next 24 hours.

No Earth-directed Coronal Mass Ejections (CMEs) can be seen in the available corona images.

The greater than 10 MeV proton flux as measured by GOES-16 dropped below nominal levels during the last 24 hours. It is expected to remain below this level for 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 threshold during the next 24 hours. The 24h electron fluence was at nominal levels and is expected to remain so.

The solar wind (SW) conditions were affected by an Interplanetary Coronal Mass Ejection (ICME) that arrived around 30 Oct 17:00 UT, as predicted. The SW speed increased from a background value of 310 km/s to 460 km/s during the last 24 hours. The total magnetic field varied between 2 and 13 nT, while the Bz varied between -11 and +8 nT in the last 24 hours. The interplanetary magnetic field phi angle was predominantly in the positive sector (directed away from the Sun) during the last 24 hours. The electron temperature increased from a background level of approximately 20000 K to 100000 K during the last 24 hours. Since the ICME arrival had a relatively small impact, geomagnetic conditions are expected to gradually return to a slow wind regime during the next 24 hours.

Geomagnetic conditions were globally and locally quiet to moderate (Kp and K Dourbes indeces 1-4). The moderate levels were the result of the expected ICME that arrived around 30 Oct 17:00 UT. However the impact of its arrival is relatively small and short-lived, hence the geomagnetic conditions are expected to be quiet for the next 24 hours.

Today's estimated international sunspot number (ISN): 063, based on 15 stations.

Solar indices for 30 Oct 2021

Wolf number Catania///
10cm solar flux107
AK Chambon La Forêt017
AK Wingst010
Estimated Ap010
Estimated international sunspot number073 - Based on 17 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 giorni130.4 -16.1

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