Viewing archive of Thursday, 16 July 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jul 16 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
16 Jul 2026	102	008
17 Jul 2026	103	010
18 Jul 2026	104	016

Solar Active Regions and flaring

Solar flaring activity has been low over the past 24 hours, with few C-class flares. The strongest flare was a C8.9 flare (SIDC Flare 8205) from beyond the east limb, peaking at 21:55 UTC on July 15. There are currently four numbered active regions on the solar disk. The most complex one is SIDC Sunspot Group 917, with magnetic type beta. SIDC Sunspot Group 917 has emerged in the northeast quadrant. SIDC Sunspot Group 918 has rotated on disk from the east limb, in the southeast quadrant. The solar flaring activity is expected to be low over the next 24 hours, with C-class flares likely and a small chance for M-class flares.

Coronal mass ejections

No Earth-directed Coronal Mass Ejections (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) were enhanced, under the ongoing influence of a high-speed stream from the southern, positive polarity coronal holes (SIDC Coronal Holes 172 and 173). The solar wind speed was between 430 km/s and 500 km/s. The interplanetary magnetic field was between 3 nT and 7 nT. The Bz component reached a minimum of -7 nT. The interplanetary magnetic field angle phi was predominantly in the positive sector. Enhanced solar wind conditions are expected initially over the next 24 hours, with a gradual decrease to slow solar wind conditions.

Geomagnetism

Geomagnetic conditions globally were quiet to unsettled (NOAA Kp 1 to 3) during the past 24 hours. Geomagnetic conditions locally were mostly unsettled (K Bel 3), with two intervals of active levels (K Bel 4) between 15:00 UTC and 16:00 UTC on July 15 and between 05:00 UTC and 07:00 UTC on July 16. Mostly quiet to unsettled conditions are expected over the next 24 hours, with a small chance for isolated active intervals.

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 and GOES 19 remained below the 1000 pfu threshold during the past 24 hours. The greater than 2 MeV electron flux is expected to remain 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): 052, based on 18 stations.

Solar indices for 15 Jul 2026

Wolf number Catania	026
10cm solar flux	100
AK Chambon La Forêt	019
AK Wingst	016
Estimated Ap	013
Estimated international sunspot number	029 - Based on 33 stations

Noticeable events summary

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

All times in UTC

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