The SIDC is part of the Royal Observatory of Belgium and a partner in the Solar Terrestrial Center of Excellence (STCE).


Solar activity was at very low levels over the past 24 hours. The six
active regions on the visible disc have remained quiet. The most complex
active region, Catania sunspot group 17/NOAA 2842 decreased its complexity
from magnetic type beta-gamma to magnetic type beta and is expected to soon
rotate over the west limb together with Catania sunspot group 20/NOAA 2845
(magnetic type beta). Catania sunspot group 22/NOAA 2846 and Catania
sunspot group 21/NOAA 2848 have remained with magnetic type beta, while
Catania sunspot group 20/NOAA 2847 has decreased its magnetic complexity to
type beta. Catania sunspot group 24/NOAA 2849 remained magnetically simple
type alpha and is no longer producing C-class flares. The X-ray flaring
activity for the next 24 hours is expected to be at very low levels with a
low probability for an isolated C-class flare.

No Earth-directed coronal mass ejections (CMEs) were 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 so in the next 24 hours. The greater than
2MeV electron flux remained under the 1000 pfu threshold and is expected to
remain so. The 24h electron fluence was at nominal levels and is expected
to remain in the next 24 hours.

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) have
recovered from the enhancements due to the small positive polarity
geo-effective coronal hole. The solar wind speed varied between 328 and 462
km/s. The total magnetic field remained weak in the range of 1.7 to 7.2 nT.
The north-south (Bz) component weakly varied between -4.8 to +4 nT. The
interplanetary magnetic field remained predominantly in the positive sector
directed away from the Sun. The solar wind conditions might get slightly
enhanced later today if a glancing blow from the July 20th CME reaches the

The geomagnetic conditions over the past 24 hours were mostly quiet with
short isolated unsettled periods. Quiet to unsettled geomagnetic conditions
are expected for the next 24 hour with possible active periods in case a
glancing blow from the July 20th CME arrives to the Earth.

Latest SWAP image

SWAP latest image

Latest USET H-alpha image
USET latest Halpha image

Latest LYRA curve

Latest LYRA Curves

Latest Callisto Observations

Daily estimated sunspot number

Most recent alerts

2021 Jul 17 1040 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2021 Jul 17 1138 UTC
A halo CME was observed on LASCO C2 starting at 05:36 UT on 17 July. This [more]

2021 Jul 16 1227 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2021 Jul 03 1820 UTC
A class X1.5 solar X-ray flare occurred on 2021/07/03 with peak time 14:29UT [more]