Aurora Activity

Aurora Activity represents PhotoWeather's location-intelligent transformation of the global Kp geomagnetic index into a personalized aurora visibility score for your exact geographic position. While the Kp index provides a planetary-scale measurement of geomagnetic storm intensity, Aurora Activity accounts for the critical fact that aurora visibility depends heavily on your geomagnetic latitude—the angular distance between your location and the nearest magnetic pole. The auroral oval, a ring-shaped zone of maximum aurora activity, expands equatorward during geomagnetic storms but remains centered on the geomagnetic poles (not the geographic poles). This means a location at 55° geomagnetic latitude experiences very different aurora conditions than a location at 65° geomagnetic latitude, even during the same Kp storm.

PhotoWeather's Aurora Activity score uses established auroral oval models to calculate the probability and intensity of auroral displays at your specific location. Scores range from 0% (no aurora expected) to 100% (strong aurora highly likely): 0-30% indicates minimal activity visible only with sensitive cameras, 40-60% suggests moderate auroras visible to the naked eye under dark skies, 70-85% indicates strong displays with vivid colors and movement, while 90-100% represents exceptional geomagnetic storm conditions with bright, dynamic auroras visible even through light pollution.

Unlike raw Kp values which require photographers to mentally convert global activity to local visibility, Aurora Activity provides an intuitive, location-specific metric for planning aurora photography sessions. This personalized approach eliminates guesswork: you instantly know whether it's worth driving to a dark sky location or waiting for a stronger storm.