Sunspot Numbers for VOACAP
The SSN source of (near-)current sunspot numbers for use with VOACAP: SIDC (Belgium).
Geomagnetic Activity
The K-index is a 3-hourly measure of geomagnetic activity on a logarithmic scale from 0 to 9. Magnetograms show variations in Earth's magnetic field — sudden strong swings in the X component indicate VHF radio-auroral activity.
Source: Tromsø Geophysical Observatory
Magnetogram: Utsjoki / Kevo
24-hour magnetogram from the Kevo Magnetic Observatory, showing the three components of Earth's magnetic field variations.
Auroral Oval
NOAA OVATION model of the current auroral oval over the northern hemisphere.
Real-Time Solar Wind
3-day plot of interplanetary magnetic field and solar wind parameters measured by the ACE spacecraft at the L1 Lagrange point.
Solar X-Ray & Proton Flux
X-Ray Flux
Class M and X flares affect the sunlit area of the Earth, causing increased D-region absorption. Strong flares are the source of Shortwave Fadeouts (SWF) and Sudden Ionospheric Disturbances (SID).
See GOES X-Ray Flux (NOAA SWPC)
Proton Flux
High-energy protons are guided into the polar cap by Earth's magnetic field. Strong proton bursts cause Polar Cap Absorption (PCA), i.e. high D-region absorption on paths through polar areas.
See GOES Proton Flux (NOAA SWPC)
