Viewing archive of Friday, 17 July 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jul 17 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
17 Jul 2026	099	008
18 Jul 2026	100	015
19 Jul 2026	100	008

Solar Active Regions and flaring

Solar flaring activity has been low over the past 24 hours, with very few C-class flares. The strongest flare was a C5.2 flare (SIDC Flare 8206) from beyond the east limb, peaking at 21:35 UTC on July 16. There are currently four numbered active regions on the solar disk. The most complex ones have a beta magnetic configuration. SIDC Sunspot Group 910 is currently rotating across the west limb. The solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Coronal mass ejections

A wide Coronal Mass Ejection (SIDC CME 690) was observed in LASCO/C2 coronagraph imagery, lifting off from the east limb, starting from 00:10 UTC on July 17. It is most likely associated with a C1.5 flare (SIDC flare 8207, peaking at 00:02 UTC) from beyond the east limb. It is not expected to impact Earth. No other Earth-directed CMEs were observed in the available coronagraph imagery during the last 24 hours.

Solar wind

Over the past 24 hours, the solar wind parameters (SOLAR-1 and ACE) showed a gradual return to slow solar wind conditions. The solar wind speed decreased from 470 km/s to 370 km/s. The interplanetary magnetic field was between 3 nT and 6 nT. The Bz component was between -5 nT and 3 nT. The interplanetary magnetic field angle phi was predominantly in the positive sector. Slow solar wind conditions are expected initially over the next 24 hours, possibly followed by enhanced conditions due to the expected arrival of a mild high-speed stream from the northern, positive polarity coronal hole (SIDC Coronal Hole 174).

Geomagnetism

Geomagnetic conditions globally were quiet (NOAA Kp 1 to 2) during the past 24 hours. Geomagnetic conditions locally during the past 24 hours were initially unsettled (K Bel 3), reaching active levels (K Bel 4) between 14:00 UTC and 15:00 UTC on July 16. A decrease to mostly quiet levels (K Bel 1 to 2) followed. Mostly quiet to unsettled conditions (NOAA Kp 1 to 3) are expected over the next 24 hours, with a chance of isolated active intervals (NOAA Kp 4) due to the expected arrival of a mild high- speed stream from the northern, positive polarity coronal hole (SIDC Coronal Hole 174).

Proton flux levels

The greater than 10 MeV proton flux was below the 10 pfu threshold during the past 24 hours. It is expected to remain below the threshold level over the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux measured by GOES 18 was above the 1000 pfu threshold between 17:45 UTC and 23:45 UTC on July 16. The greater than 2 MeV electron flux is expected to remain mostly below the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence was at normal levels and it is expected to remain so over the next 24 hours.

Today's estimated international sunspot number (ISN): 035, based on 22 stations.

Solar indices for 16 Jul 2026

Wolf number Catania	060
10cm solar flux	101
AK Chambon La Forêt	012
AK Wingst	012
Estimated Ap	011
Estimated international sunspot number	052 - Based on 23 stations

Noticeable events summary

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

All times in UTC

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