The Dst Index is a primary gauge for geomagnetic storm severity, derived from a worldwide network of near-equatorial magnetometer stations. It calculates the globally averaged disturbance in the horizontal (H) component of Earth's magnetic field. As solar storms inject energetic ions into the magnetospheric ring current, they create a magnetic field that directly opposes Earth’s field, pushing Dst values deeply negative.

The NOAA SWPC tracks the outer radiation belt using geostationary GOES satellites to issue Electron Flux Alerts. Warnings are activated when the >=2 MeV electron flux exceeds 1,000 pfu for three consecutive 5-minute intervals. This indicator warns operators of deep-dielectric charging, where accumulated internal electrical charges in spacecraft components can cause sudden arcing, leading to phantom commands or permanent satellite damage.

A parameter to which we actively contribute using the Solar Flux Telescope (CLT). Similar to the case of X-rays (see R-scale), the amounts of energy emitted during solar flares are reflected in the measurements of solar energy flux as so-called radio bursts. If the measurements increase abruptly, they are converted to the warning scale according to the following scheme: Increase in solar flux greater than:

The NOAA SWPC uses the G-Scale to categorize the severity of Geomagnetic Storms caused by solar wind variations. The scale directly maps to the planetary Kp-index, ranging from G1 (Kp = 5) up to G5 (Kp = 9). It serves as a vital operational warning system for power grid operators regarding transformer damage, pipeline engineers tracking corrosive currents, and satellite flight dynamics teams monitoring increased atmospheric drag and surface charging.

Total Electron Content (TEC) is the integrated electron density along a signal path through Earth's ionosphere, measured in TEC Units (TECU). Rapid increases in TEC, driven by solar EUV/X-ray flares and geomagnetic storms, directly modify the refractive index of the upper atmosphere. This causes signal phase delays and range errors for Global Navigation Satellite Systems (GNSS/GPS), high-frequency (HF) radio degradation, and satellite-to-ground communication disruptions, making it a critical metric for precision aviation and maritime navigation. We determine the total electron content using our own GNSS measurements.

The NOAA SWPC uses the R-Scale to categorize Radio Blackouts caused by sudden solar flare X-ray emissions. The primary metric is the peak X-ray flux measured in by GOES satellites, mapping directly to flare classes from R1 (M1 class) up to R5 (X20 class). It warns maritime, aviation, and military operators of sudden ionospheric absorptions that block HF radio communication and cause positioning errors in low-frequency navigation systems.

The NOAA Space Weather Prediction Center (SWPC) uses the S-Scale to categorize Solar Radiation Storms. The primary metric is the elevated proton flux (>=10 MeV), measured in Particle Flux Units (pfu) by GOES satellites. Stoms range from S1 (>=10 pfu) to S5 (>=100,000 pfu). It warns industries of polar HF radio communication failures, spacecraft orientation errors, and heightened radiation hazards.