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Daily bulletin on solar and geomagnetic activity from the SIDC
Emesso: 2019 May 31 1250 UTC
SIDC Forecast
Brillamenti solari
Quiet conditions (<50% probability of C-class flares)
Geomagnetism
Quiet (A<20 and K<4)
Protoni solari
Quiet
| 10cm flux | Ap | |
|---|---|---|
| 31 May 2019 | 070 | 006 |
| 01 Jun 2019 | 071 | 007 |
| 02 Jun 2019 | 072 | 007 |
Bulletin
The solar activity has been quiet over the past 24 hours. The X-ray flux remains below B-level, and the visible solar disc is spotless. Solar activity is expected to remain at low levels over the next 24 hours.
No Earth directed Coronal Mass Ejection (CME) has been detected in the available coronagraph imagery. The greater than 10 MeV solar protons flux remained at nominal levels over the past 24 hours and is expected to remain so.
Solar wind parameters showed the beginning of slow return towards an ambient background and slow solar wind speed regime. Solar wind speed decreased from 520 to near 425 km/s. Total interplanetary magnetic field strength remained below 5 nT. The Bz component underwent only weak deviations ranging between 3.6 nT and -3.5 nT. The solar wind parameters are expected to slowly decrease further today and tomorrow to reach the nominal levels.
The geomagnetic conditions have been mostly quiet with short intervals of K-Dourbes = 3 in the beginning of the period. The geomagnetic conditions are expected to remain quiet as the influence of the wind stream associated with the negative polarity equatorial coronal hole which began to traverse the central meridian on May 24 is fading away.
Today's estimated international sunspot number (ISN): 000, based on 24 stations.Solar indices for 30 May 2019
| Wolf number Catania | 000 |
| 10cm solar flux | 069 |
| AK Chambon La Forêt | 014 |
| AK Wingst | 010 |
| Estimated Ap | 010 |
| Estimated international sunspot number | 000 - Based on 30 stations |
Noticeable events summary
| Day | Begin | Max | Fine | Loc | Strength | OP | 10cm | Catania/NOAA | Radio burst types | |
|---|---|---|---|---|---|---|---|---|---|---|
| Nessuna | ||||||||||
Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive
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Ultime notizie
M8.1 solar flare with earth-directed CME
X1.9 solar flare, Coronal hole faces Earth
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Notizie sul meteo spaziale
| Ultimo brillamento X | 2025/12/08 | X1.1 |
| Ultimo brillamento M | 2025/12/12 | M1.1 |
| Ultima tempesta geomagnetica | 2025/12/12 | Kp5 (G1) |
| Giorni senza macchie | |
|---|---|
| Ultimo giorno senza macchie | 2022/06/08 |
| Media mensile Numero di Macchie Solari | |
|---|---|
| novembre 2025 | 91.8 -22.8 |
| dicembre 2025 | 131.8 +40 |
| Ultimi 30 giorni | 108.3 +14.5 |